| Synthesis of Polyimides Produced from Novel High Temperature Polyhedral Oligomeric Silsesquioxane Dianilines |
26-Mar-2009 |
3 pages |
| Authors:
Vandana Vij; Joseph M Mabry; Timothy S Haddad; Gregory R Yandek; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
 | Polyimides (PIs) are used extensively in a variety of applications such as circuit-printing films and semiconductor coatings in the microelectronics industry, spacecraft materials including solar arrays, thermal insulation blankets, and space inflatable structures, and in components in modern aircraft. PIs are well known for their thermal stability but are prone to long-term oxidative degradation and are notorious for having hydrothermal issues, especially when used in fiber-reinforced composites. A potential approach ... |
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| A Finite Element Evaluation of an Experiment Related to Coating Damping Properties |
Mar-2009 |
145 pages |
| Authors:
Armando DeLeon; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Typically turbine engine blades gain protection from thermal damage by the use of hard coatings, such as magnesium aluminate spinel. Known as Thermal Barrier Coatings (TBC's), they have material properties that include several nonlinearities. These TBC's create damping primarily due to their nonlinear dissipation of energy. In order to effectively represent their damping properties, it is necessary to create a method which combines experimentation and analysis. Previous work has shown ... |
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| Fabrication of Nanolaminates with Ultrathin Nanolayers Using Atomic Layer Deposition: Nucleation & Growth Issues |
Feb-2009 |
36 pages |
| Authors:
Steven M George; COLORADO UNIV AT BOULDER DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| This AFOSR grant concentrated on the fabrication of nanolaminates with ultrathin nanolayers using atomic layer deposition (ALD) and molecular layer deposition (MLD) techniques. Nanolaminates are multilayered thin film structures with nanometer dimensions and very high interfacial density. These multilayer structures can display novel properties that can be optimized by manipulating the thickness and composition of the individual nanolayers. During this grant, the research examined nucleation and growth issues involved in ... |
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| General Procedure for Protective Cooling and Equipment Evaluations Relative to Heat and Cold Stress |
01-Sep-2008 |
27 pages |
| Authors:
Catherine O'Brien; Bruce S Cadarette; Thomas L Endrusick; Laurie A Blanchard; Xiaoxiang Xu; Larry G Berglund; Michael N Sawka; Reed W Hoyt; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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| As part of the U.S. Army materiel development and acquisition process, clothing and individual equipment (CIE) must undergo a Health Hazard Assessment (HHA) conducted by the U. S. Army Center for Health Promotion and Preventive Medicine. Scientists at the U.S. Army Research Institute of Environmental Medicine (USARIEM) are world experts in thermal physiology, biophysics, and biomedical modeling and are uniquely capable of providing technical measurements and subject matter expertise for ... |
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| A Novel Method for Characterizing the Impact Response of Functionally Graded Plates |
01-Sep-2008 |
368 pages |
| Authors:
Reid A Larson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| Functionally graded material (FGM) plates are advanced composites with properties that vary continuously through the thickness of the plate. Metal-ceramic FGM plates have been proposed for use in thermal protection systems where a metal-rich interior surface of the plate gradually transitions to a ceramic-rich exterior surface of the plate. The ability of FGMs to resist impact loads must be demonstrated before using them in high-temperature environments in service. This dissertation ... |
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| Energy and Process Optimization Assessment at U.S. Army Installation in Germany: Keiserslautern Army Depot, Piermasens Army Depot, Katterbach Kaserne, Storck Barracks in Illesheim, and U.S. Army Garrison Wiesbaden Schools |
SEP 2007 |
240 pages |
| Authors:
Alexander M. Zhivov; David M. Underwood; John L. Vavrin; Alfred Woody; Curt Bjork; James Newman; Erja Reinkinen; Timo Husu; Michael Schmidt; Manfred Klassek; CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL
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| An energy and process optimization assessment (EPOA) study was conducted at selected U.S. Army installations in Germany and at two U.S. Army Garrison Wiesbaden schools to identify potential for energy conservation at those locations. The study identified energy conservation, process optimization, and environmental improvement opportunities that could significantly reduce operating costs and improve the installations mission readiness and competitive position. Eighty five energy conservation measures (ECMS) were identified, most of ... |
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| Conduction and Convection of Heat Produced by the Attenuation of Laser Beams in Liquids |
SEP 2007 |
44 pages |
| Authors:
Irwin S. Goldberg; Misty Garcia; Saher Maswadi; Robert J. Thomas; Clifton D. Clark; SAINT MARY'S UNIV OF SAN ANTONIO TX
|
| Mathematical models are used to simulate temperature changes that are induced by the absorption of energy from propagating laser beams in water. Both convective and conductive heat transfer are considered. Thermally insulated surfaces as well as surfaces involving heat transfer with the surroundings are considered. The simulated results demonstrate the importance of thermal convection. In the first part of this report containers with closed surfaces are considered. In the second ... |
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| Determination of Effective Recombination Probability: Detailed Aspects of a Macroscopic Methodology |
01 JUL 2007 |
47 pages |
| Authors:
P. Rini; G. Degrez; UNIVERSITE LIBRE DE BRUXELLES (BELGIUM)
|
| The purpose of the present Lecture Series is to provide an up-to-date review of the experimental techniques, the theoretical models, as well as the numerical simulation strategies involved in the treatment of the chemical character of high temperatures gases. To this end, aspects of both materials and high temperatures uid sciences are discussed together, with the aim of enhancing the improvements in the understanding of the processes of heat release ... |
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| Reacting Flows Simulation with Applications to Ground to Flight Extrapolation |
01 JUL 2007 |
21 pages |
| Authors:
P. F. Barbante; POLITECNICO DI MILANO (ITALY) IST DI MATEMATICA
|
| The development of next generation reusable space vehicles requires a precise qualification of their Thermal Protection System materials. The catalytic properties are usually determined in plasma wind tunnels for sets of test conditions relevant to the planned flight mission program. Therefore, for such a situation, it is important to have a methodology that allows for the correct extrapolation of the ground test conditions to the real flight ones and vice-versa. ... |
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| MEANS2: Knowledge Oriented Materials Engineering of Layered Thermal Barrier Systems (NOMELT) |
04 JUN 2007 |
3 pages |
| Authors:
John R. Smith; DELPHI CORP TROY MI
|
| The hot-section turbine components of aircraft engines can depend on a thermally-grown, thin alpha-alumina layer for corrosion and oxidation protection. This thermal processing can leave a continuous layer of gamma-Ni (Al) adjacent to the oxide. Since the oxide must remain adherent upon thermal cycling, it is essential to quantify the factors affect adhesion at the gamma-Ni (Al) /alpha-alumina interface. We have previously shown that this adhesion is sensitive to the ... |
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| First Principles and Multi-Scale Modeling of the Roles of Impurities and Dopants on Thermal Barrier Coating Failure |
31 MAR 2007 |
12 pages |
| Authors:
Emily A. Carter; PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| Optimization of thermal barrier coating materials is the main objective of this research, in order to increase the service lifetimes of aircraft engines. To this end, it is critical to first understand mechanisms of failure, and then use those insights to design materials countermeasures. This grant supported the following research efforts in those directions: (1) Developments of ultrasoft spin-dependent pseudopotential theory and a solid state phase transition path search algorithm; ... |
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| Knowledge Oriented Materials Engineering of Layered Thermal Barrier Systems (NOMELT) |
31 DEC 2006 |
13 pages |
| Authors:
David Srolovitz; Kevin Hemker; Anthony Evans; John Hutchinson; Tresa Pollock; John Smith; PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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| A team from academia, Air Force laboratories and industry has been assembled to develop a design code for one of the prevailing failure modes in thermal barrier systems used for aero-turbines. The failure mechanism to be addressed occurs in systems with two-phase bond coats and is manifest as abrupt delamination along the interface between the thermally grown oxide (TGO) and the intermetallic bond coat. The code will integrate several important ... |
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| Use of a Spacer Vest to Increase Evaporative Cooling Under Military Body Armor |
JUL 2006 |
6 pages |
| Authors:
Thomas L. Endrusick; Larry G. Berglund; Julio A. Gonzalez; Richard Gallimore; James Zheng; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
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| U.S. military forces are currently using the Interceptor Body Armor (IBA) system which can increase human thermal stress when worn in arid environments. This study investigated a spacer vest (SV) designed to distance the IBA from the wearer's skin surface, increasing evaporative cooling around the torso. A series of lightweight SV designed to be worn under the IBA was tested for thermal insulation and water vapor permeability on a sweating ... |
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| A Novel Method for Measurement of Total Hemispherical Emissivity |
JUN 2006 |
15 pages |
| Authors:
Saeed Moghaddam; John Lawler; Joseph Currano; Jungho Kim; ADVANCED THERMAL AND ENVIRONMENTAL CONCEPTS INC COLLEGE PARK MD
|
| This report was developed under a SBIR contract. This paper describes a heat flux-based method for measuring emissivity of a surface. In this method the emissivity of a surface is calculated using direct measurement of the heat flux passing through the surface. Unlike storage-based calorimetric methods, this method does not require application of known amounts of heat to the surface or the temperature history of a known amount of thermal ... |
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| Development of Composite Materials with High Passive Damping Properties |
15 MAY 2006 |
129 pages |
| Authors:
Malcolm J. Crocker; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
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| In applications where the use of lightweight structures is important, the introduction of a viscoelastic core layer, which has high inherent damping, between two face sheets, can produce a sandwich structure with high damping. Composite sandwich structures have several advantages, such as their high strength-to-weight ratio, excellent thermal insulation, and good performance as water and vapor barriers. So in recent years, such structures have become used increasingly in transportation vehicles. ... |
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| State of the Art and Future Trends in the Development of Thermal Barrier Coating Systems |
01-May-2006 |
21 pages |
| Authors:
XIAO HUANG; Jogender Singh; Prakash C Patnaik; NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO)
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| Thermal barrier coating (TBC) systems are the most effective means of protecting structural components from damage caused by excessive temperature and corrosive/erosive environments. The applications for TBCs range from gas turbines and power generators to space and military equipment. As the durability and performance of high temperature components rely more and more on TBCs, the capability of these coatings has become an important variable in the design and development of ... |
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| Current MBDA R&T Effort on Ram/Scramjet and Detonation Wave Engine |
May-2006 |
25 pages |
| Authors:
Francois Falempin; MBDA FRANCE CHATILLON
|
| Since the fifties, MBDA France, in close cooperation with ONERA, has been leading a sustained effort to develop ramjet technology. This strong involvment led to the development of the Air Sol Moyenne Port?e (ASMP or Medium Range Air-to-Ground) missile which entered service in the French Air Force in 1986 and will be soon replaced by ASMP A. Beyond this development, a lot of advanced studies were performed during the nineties ... |
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| Low Temperature Reactivities of Ultra-High Temperature Ceramics (Hf-X System) |
MAR 2006 |
11 pages |
| Authors:
Yigal Blum; SRI INTERNATIONAL MENLO PARK CA
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| A growing interest in ultra-high temperature ceramics and their aerospace and turbine applications has led to a renewal of activities to fabricate MB2/SiC composites as the materials of choice, because of their high thermal and oxidation resistance stability. Unfortunately, these composites are currently formed by an expensive, size and shape limited hot-press operation at a temperature range of 1900 to 2200 degrees C. The project investigated chemical reactions at and ... |
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| Void Detection in Foam With Knit Lines Using THz Pulse Interrogation |
04 FEB 2006 |
11 pages |
| Authors:
H. T. Banks; N. L. Gibson; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
|
| We model electromagnetic interrogation of a polyurethane foam using the TE mode of the 2D Maxwell's equations reduced to the wave equation for a fixed frequency in the THz regime. The foam block target contains knit lines which are modeled by modifying the speed of propagation, i.e., by altering the index of refraction. We describe our efforts to estimate the dielectric constant in the knit lines, as well as in ... |
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| Fire Resistant Composite Closed Cell Foam and Nonwoven Textiles for Tents and Shelters |
JAN 2006 |
41 pages |
| Authors:
Stephen C. Davis; Jennifer L. Kalberer; ARMACELL LLC MEBANE NC
|
| The objective of the overall effort is to develop a fire resisting elastomeric closed cell foam as a component of a nonwoven fabric -- foam composite for fabrication of rapidly deployed shelters. The foam component is designed to provide superior fire resisting properties and thermal insulation compared to current shelter materials. The present report summaries results of development work which led to a light weight, flexible foam with exceptional burn-through ... |
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| Recirculating Thermocatalytic Air Purifier for Collective Protection |
2006 |
14 pages |
| Authors:
Mike R. Powell; Seung-Ho Hong; Sam Paulsen; MESOSYSTEMS TECHNOLOGY INC KENNEWICK WA
|
| MesoSystems Technology Inc. is developing a recirculating air purifier that deactivates chemical and biological contaminants without the need for replaceable filters or adsorbents. The thermocatalytic air purifier (TCAP) is based on three enabling technologies: (1) lightweight, high-effectiveness heat exchangers; (2) aerogel-based insulation; and (3) Honeywell's Military Air Purification catalyst, which is proven capable of oxidizing a wide variety of chemical agents. TCAP prototypes have demonstrated high single-pass destruction efficiencies for ... |
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| High Temperature Coatings by Pulsed Electron Beam Ablation |
AUG 2005 |
44 pages |
| Authors:
Olivier Sudre; David B. Marshall; Sergio Lucato; ROCKWELL SCIENTIFIC CO THOUSAND OAKS CA
|
| The objective of this program was to investigate the deposition and properties of new high temperature coatings using pulsed-electron-beam ablation (PEBA) and to characterize the corrosion of those compounds in relevant environments. The PEBA technique has potential advantages for depositing compounds that are known to be difficult to deposit by conventional electron-beam evaporation. The use of ablation rather than melting and evaporation avoids changes in composition associated with differing evaporation ... |
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| Cryogenic and LOX Based Propulsion Systems for Robotic Planetary Missions |
13 JUL 2005 |
8 pages |
| Authors:
Dominique Valentian; SNECMA MOTEURS VERNON (FRANCE) MOTEURS SPATIAUX DIV
|
| Robotic planetary missions use almost exclusively storable propellants. However, it is clear that the use LOX/LH2 and LOX/HC combinations will offer a tremendous payload gain for most robotic missions. The perceived complexity of cryogenic propulsion, the need of cryogenic propellants active refrigeration to eliminate boil-off losses and the high acceleration imparted to spacecraft structure by high thrust cryogenic engines have prevented the use of cryogenic propulsion for robotic missions. Elaborated ... |
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| Evaluation of the Efficiency of Liquid Cooling Garments using a Thermal Manikin |
MAY 2005 |
4 pages |
| Authors:
Xiaojiang Xu; Thomas Endrusick; Julio Gonzalez; Brad Laprise; Walter Teal; William Santee; Margaret Kolka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
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| Liquid cooling garments (LCG) absorb heat from both the human body and the environment. The cooling efficiency is influenced by the configurations of the LCG and clothing ensembles worn over the LCG (outer clothing, e.g. personal protective equipment), and environmental conditions. Thermal manikins (TM) have been used to evaluate the performance of LCG systems and to determine the amount of heat that a LCG can extract from a TM. However, ... |
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| Technical Operations Support (TOPS) II. Delivery Order 0007: Thermal Barrier Coatings |
01-Feb-2005 |
22 pages |
| Authors:
UNIVERSAL TECHNOLOGY CORP DAYTON OH
|
| This work formed the second part of an investigation into the use of Gd203 as an alternative stabilizer for Zr02-based thermal barrier coating (TBC) materials. The current state-of-the-art TBC material, Y203-stablized Zr02 (3.5-4 mole percent y203), referred to as YSZ, suffers from limited durability at use temperature above 100-1200 deg C. Our previous work investigated the influence of Gd203 concentration on the sintering and phase stability of conventional Zr02 powders. ... |
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| First Principles and Multi-Scale Modeling of the Roles of Impurities and Dopants on thermal Barrier Coating Failure |
DEC 2004 |
13 pages |
| Authors:
Emily A. Carter; CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| Prevention or at least delay of thermal barrier coating failure Is the main objective of this research, In order to increase the service lifetimes of aircraft engines. To this end, It is critical to first understand mechanisms of failure, and then use that insight to design materials countermeasures. This grant supported the following research efforts in those directions: * Developments of a new pseudo potential theory and a solid state ... |
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| Numerical Modeling of Internal Flow Aerodynamics. Part 1: Steady State Computations |
JAN 2004 |
17 pages |
| Authors:
Jean-Francois Guery; SNPE CENTRE DE RECHERCHES DU BOUCHET VERT-LE-PETIT FRANCE
|
| Internal ballistics in a SRM can be solved with various ways and for various objectives 2. The motor design engineer wants to predict or understand the burning characteristics and the global performances of the motor, seek the efficiency of thermal insulation and nozzle design, check the reliability of ignition and motor design for the life cycle of the motor, take into account variability induced by manufacturing processes, etc. |
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| Predicting the Effect of Defect Distributions in the Bulk and on Surfaces of Ceramic Materials |
31 OCT 2003 |
25 pages |
| Authors:
Mark R. Levy; Robin W. Grimes; IMPERIAL COLL LONDON (UNITED KINGDOM)
|
| This report results from a contract tasking Imperial College, London as follows: The contractor will investigate and ultimately develop ways to select optimum compositions for materials using atomic scale computer simulation. The particular material systems to be studied are: pyrochiores and fluorites (important in fuel cell and oxygen generator applications and as thermal barrier coatings on turbine blades in jet engines), and the perovskites, important electronic ceramics that also act ... |
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| Usage of supersonic Cold Gas-Dynamic Spraying (CGDS) for Obtaining a Catalytic Coatings for Systems of Steam Reforming of Fuel and Chemical Heat Recovery |
20 OCT 2003 |
8 pages |
| Authors:
D. V. Dzhurinskiy; T. S. Vinogradova; B. V. Farmakovskiy; I. C. Mashek; A. L. Kuranov; A. V. Korabelnikov; LENINETZ HOLDING CO NIPGS SAINT PETERSBURG (RUSSIA) HYPERSONIC SYSTEM RESEARCH INST
|
| The problem of development of new technologies dedicated for creation of materials which are capable to ensure implementation of active thermal protection of a HFV unique propulsion system, systems of directional power transmission and protection against radiation is one of the major ones among the problems of HFV creation. The complex of problems related to materials for creation of hypersonic flight vehicles includes development of catalytic materials for the power ... |
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| Optimizing Functionally Graded Materials to Resist Failure under Dynamic Loadings |
25 NOV 2002 |
13 pages |
| Authors:
Toshio Nakamura; STATE UNIV OF NEW YORK RESEARCH FOUNDATION AT STONY BROOK OFFICE OF SPONSOREDPROGRAMS
|
| After three years of the project, many of the proposed research topics have been completed and manuscripts were submitted for publication. First, for the dynamic crack propagation within functionally graded materials (FGMs), a novel fracture criterion was introduced. It is based on energy concept and controls crack growth rate and associated plastic dissipation flow. This model was implemented in dynamic failure analysis to investigate crack propagation within elastic plastic graded ... |
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| Final Technical Report for Contract No. F49620-00-1-0054 |
NOV 2002 |
11 pages |
| Authors:
Emily A. Carter; CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| The report summarizes the accomplishments by E. A. Carter during Dec. 1, 1999 to Nov. 30, 2002. New theories for describing the structure of electrons in condensed matter were developed: (i) a quantum mechanical embedding theory allows treatment of localized electronic excited states of adsorbates or impurities on and in metals; (ii) the most advanced kinetic energy density functional was derived, which allows for a linear scaling treatment of metallic ... |
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| AMTEC Generator: Phase 1 Propane System |
15 OCT 2002 |
29 pages |
| Authors:
Jan E. Pantolin; ADVANCED MODULAR POWER SYSTEMS INC ANN ARBOR MI
|
| Alkali Metal Thermal to Electric Conversion (AMTEC) technology converts the heat from virtually any combustible fuel directly to electric power. This technology has the potential to be very efficient, even at low power levels. This Phase 1 program set the path for AMTEC generator development to meet the Palm Power program goals of a 20-watt system with a specific energy density (including the fuel) of 3000 watts per hour/kilogram for ... |
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| AFRL POSS Applications Research |
03 SEP 2002 |
24 pages |
| Authors:
Shawn Phillips; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| The Air Force is heavily invested in POSS Applications Research and Development. Currently one application is being 'flight'tested' for a technology transition. New applications are being investigated (e.g. batteries, capacitors, radomes). The technology transfer to Hybrid Plastics is a success story with significant volume increase and price reduction. POSS Nanotechnology Offers Versatility. |
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| Reactions of Energetic Ions with Thin Film Surfaces |
28 JUN 2002 |
10 pages |
| Authors:
Dennis C. Jacobs; NOTRE DAME UNIV IN DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| The PI has designed and constructed a multi function vacuum chamber for evaporating metal films and depositing insulating layers. The chamber is to be used for fabricating metal-insulator-metal (M-I-M) devices that function as novel solid-state electron emitters. Nanoscale M-I-M devices deliver hot electrons to the metal/vacuum interface from within the solid. These hot electrons can stimulate nonthermal chemical reactions at the gas/surface interface or supplement the charge density of a ... |
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| From Pole to Pole a Thermal Challenge |
APR 2002 |
|
| Authors:
M. W. Radomski; A. Buguet; DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)
|
 | The issues of thermal physiology, protection, modeling, survival, and injury have been addressed in thousands of publications over the decades, and the topic of thermal protection and survival has been the subject of several NATO DRG and AGARD symposia. Therefore, rather than review the current state of the art of the field which is the subject of the many papers that will be presented at this Symposium, this paper re-examines ... |
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| Recent Advances in Protective Clothing Technology |
APR 2002 |
8 pages |
| Authors:
Wendell Uglene; MUSTANG SURVIVAL CORP RICHMOND (BRITISHCOLUMBIA)
|
| Several recent advances in protective clothing technology are presented. The advances are related to floatation, thermal protection, anti-gravity protection, and the integration of protective clothing and equipment, which are specific areas of technical expertise for Mustang Survival Corporation. |
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| Individual Cooling Systems Results and Quantified Performances Using all Objective Method |
APR 2002 |
4 pages |
| Authors:
B. Warme-Janville; D. Anelli; ETABLISSEMENT TECHNIQUE CENTRAL DE L'ARMEMENT VERT-LE-PETIT (FRANCE) CENTRE D'ETUDES DU BOUCHET
|
| The evaluation of individual thermal assistance equipment can be quantified through numerous parameters. However, to assert efficiency and interest for a military user under tropical climate, it is necessary to follow a quantifying method. This process of existing and prototyped measurements, based on simulations, with a dummy man and tests with voluntary subjects, using a scale of comparison. It has been clearly defined and used to evaluate of more as ... |
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| U.S. Military Use of Thermal Manikins in Protective Clothing Research |
APR 2002 |
12 pages |
| Authors:
Thomas L. Endrusick; Leander A. Stroschein; Richard R. Gonzalez; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
|
| The U.S. military has utilized thermal manikins in protective clothing research for nearly 60 years. Prior to their development, the evaluation of textile thermal insulation was limited to one-dimensional, guard-ring flat plates. During WW II, thermal manikins were instrumental in obtaining knowledge of combat clothing ensemble insulation during simulated adverse environmental conditions. Additionally, reports from the various combat theaters regarding the inadequacies of certain clothing components prompted numerous thermal manikin ... |
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| Synthesis and In-Situ Atomic Oxygen Erosion Studies of Space-Survivable Hybrid Organic/Inorganic Polyhedral Oligomeric Silsesquioxane Polymers |
22 MAR 2002 |
|
| Authors:
Rene I. Gonzalez; FLORIDA UNIV GAINESVILLE DEPT OF CHEMICAL ENGINEERING
|
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| Hybrid Inorganic/Organic Reactive Polymers for Severe Environment Protection |
21 FEB 2002 |
11 pages |
| Authors:
Shawn H. Phillips; Rene I. Gonzalez; Rusty L. Blanski; Brent D. Viers; Gar B. Hoflund; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| Leading-edge, fundamental research in polymer technology is often directed towards those applications requiring dramatic improvements in temperature or oxidation resistance. While non-reactive polymers systems are often desired, many benefits can be realized by utilizing inorganic, reactive molecules within the polymer matrix. In such systems, a sacrificial layer of the hybrid polymer is destroyed until passivation occurs. Over the last decade the Air Force Research Laboratory has studied how the incorporation ... |
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| Improved Thermal Barrier Coating System Based on a Cathodically Deposited Alpha Alumina Sublayer |
APR 2001 |
31 pages |
| Authors:
Rabi S. Bhattacharya; Bhaskar S. Majumdar; UES INC DAYTON OH
|
| This report was developed under a SBIR contract for Topic AF00-146. The primary objective of this Phase I research was to evaluate the feasibility of using an alpha alumina sublayer to reduce oxidation damage and improve the life of advanced thermal barrier coatings (TBC). A patented filtered cathodic arc deposition technique was used to deposit a 0.5-micrometers-thick alumina sublayer at 1000 deg C on a Pt-Al bond-coat deposited on a ... |
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| Improved Thermal Barrier Coating System Based on a Cathodically Deposited Alpha Alumina Sublayer |
APR 2001 |
|
| Authors:
Rabi S. Bhattacharya; Baskar Majumdar; UES INC DAYTON OH
|
| This report has been developed under a SBIR contract for Topic AF00- 146. The primary objective of this Phase I research was to evaluate the feasibility of using an alpha alumina sublayer to reduce oxidation damage and improve life of advanced thermal barrier coatings (TBC). A patented filtered cathodic arc deposition technique was used to deposit a 0.5 um thick alumina sublayer at 10000C on a Pt-Al bond-coat deposited on ... |
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| Deposition of Undercooled Liquid Ceramics |
24 MAR 2001 |
22 pages |
| Authors:
William Hofmeister; Joseph Wehrmeyer; VANDERBILT UNIV NASHVILLE TN DIV OF SPONSORED RESEARCH
|
| The objective of the research is to show that ceramic particles can be melted in flight, undercooled in flight, and impacted on a substrate to form a thick film. It is further hypothesized that with adequate process control, deposits of high temperature ceramics can be created on heat sensitive substrates, e.g., hybrid electronic structures. The approach is to flow powders in a gas stream through a region of high photon ... |
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| Crack Problems in Graded Coatings |
MAR 2001 |
52 pages |
| Authors:
Bora Yildirim; Fazil Erdogan; LEHIGH UNIV BETHLEHEM PA
|
| In this report a two-dimensional finite element technique is developed to study various mechanical, thermal and fracture mechanics problems encountered in the failure analysis of thermal barrier coatings. The system considered consists of the substrate, bond coat, thermally grown oxide and the top coat. The fracture problems studied include edge debonding, surface cracking, T-shaped cracks and periodic debond cracks along the bond coat / thermally grown oxide interface. The results ... |
|
| Design of a Mini Thermo-Acoustic Refrigerator |
MAR 2001 |
102 pages |
| Authors:
Seyhmus Direk; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A miniature thermoacoustic refrigerator is being developed for the purpose of cooling integrated circuits below their failure temperature when used in hot environments. The development of an electrically powered acoustic driver that powers the thermoacoustic refrigerator is described. The driver utilizes a flexural tri-laminar piezoelectric disk to generate one to two Watts of acoustic power at 4 kHz in 15 bar of He-Kr gas mixture. This thesis is the second ... |
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| Evaluation of Monolithic Ceramics and Ceramic Thermal Barrier Coatings for Diesel Engine Applications |
MAR 2001 |
40 pages |
| Authors:
Jeffrey J. Swab; Paul J. Huang; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The Metals and Ceramics Research Branch (MCRB) of the Weapons and Materials Research Directorate is providing ceramic material characterization and evaluation to the Tank Automotive Research, Development, and Engineering Center (TARDEC) as a part of a project entitled "Fighting Vehicle Propulsion Technology Using Ceramic Materials." Through research and exploratory development of advanced ceramics and other technologies, the objective of this project is to improve the mobility of future Army fighting ... |
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| Buckling of Graded Coatings. A Continuum Model |
OCT 2000 |
217 pages |
| Authors:
Tz-Cheng Chiu; LEHIGH UNIV BETHLEHEM PA
|
| Requirements for the protection of hot section components in many high temperature applications such as earth-to-orbit winged planes and advanced turbine systems have led to the application of thermal barrier coatings (TBCs) that utilize ceramic coatings on metal substrates. An alternative concept to homogeneous ceramic coatings is the functionally graded materials (FGM) in which the composition of the coating is intentionally graded to improve the bonding strength and to reduce ... |
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| Processing and Deposition of Nanocrystalline Oxide Composites for Thermal Barrier Coatings |
30 SEP 2000 |
5 pages |
| Authors:
Jackie Y. Ying; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING
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| As described in a previous report 1, electrophoretic deposition (EPD) was used as the method for depositing thermal barrier coatings (TBC). In this report, we used the conventional technique of plasma spraying to deposit a CoNiCrAlY bond coat on the substrates. Following deposition of the plasma sprayed bond coat, electrophoretic deposition was used to deposit Al2O3-Y2O3- ZrO2 thermal barrier coatings. We examined the thermal stability of ... |
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| Damage Assessment in High Temperature Materials |
25 MAY 2000 |
15 pages |
| Authors:
Golam Newaz; WAYNE STATE UNIV DETROIT MI DEPT OF MECHANICAL ENGINEERING SCIENCES
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| An Echotherm thermal wave imaging system was acquired from Thermal Wave Imaging, Inc. of West Bloomfields, Michigan and implemented as a nondestructive evaluation in our laboratory at Wayne State University. The DURIP grant was matched by Wayne State University. The equipment implementation was completed by end of January, 2000. The thermal wave imaging equipment was checked for its capability in assessment of damage in various ... |
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| Nonintrusive Diagnostic Strategies for Arcjet Stream Characterization |
APR 2000 |
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| Authors:
Douglas G. Fletcher; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCHCENTER
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| In the previous lecture, the issues related to arcjet flow modeling were introduced, and the limitations of conventional instrumentation in addressing these issues were discussed The general level of understanding of the arcjet flows was seen to preclude the use of arcjets as aerothermodynamic test facilities beyond the current role in aerothermal material testing, despite their long test duration capability. In this section, the focus will be on new developments ... |
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Reports by Keyword(s)
THERMAL INSULATION
