| Electron Multipactor: Theory Review, Comparison and Modeling of Mitigation Techniques in ICEPIC |
Mar-2009 |
117 pages |
| Authors:
Neil Rogers; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | Mitigation approaches for single surface multipactor at dielectric windows are investigated using Particle-In-Cell (PIC) simulations. Initially baseline susceptibility diagrams are constructed analytically and compared with self-consistent, dynamic system trajectories. The power deposited on the surface of a dielectric window in an HPM system is considered using three different methods and the results of PIC simulations. Geometric mitigation is then considered by varying the window orientation with respect to the HPM ... |
|
| Hot-Pressed Versus Sintered LiTi2(PO4)3 |
Feb-2009 |
28 pages |
| Authors:
Jeff Wolfenstine; Jan L Allen; James Sumner; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| The electrical and mechanical properties of hot-pressed versus sintered LiTi2(PO4)3 were investigated. The hot-pressed LiTi2(PO4)3 had a higher density and larger average grain size than the sintered material. As a result of these microstructural differences, the hot-pressed material exhibited a higher total ionic conductivity and lower hardness. The electronic conductivity of both materials was the same, and increased by a factor of about 107 when the hot-pressed and sintered materials ... |
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| Measurements of Secondary Electron Yield from Materials with Application to Depressed Collectors |
04 APR 2008 |
41 pages |
| Authors:
Edl Schamiloglu; Mark Gilmore; NEW MEXICO UNIV ALBUQUERQUE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This final technical report reviews the research activities during the period of this grant, emphasizing the final year. The key finding of our study is that the total incident electron dose is a critical parameter affecting secondary electron emission (SEE). A completely automated experimental set-up was implemented that allowed for measurement of secondary electron yield (SEY) as a function of beam energy, angle of incidence of primary electrons, electron dose, ... |
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| Enhanced Osteoblast Functions on Nanophase Titania in Poly-lactic-co-glycolic Acid (PLGA) Composites |
13 JUL 2005 |
6 pages |
| Authors:
Huinan Liu; Elliott B. Slamovich; Thomas J. Webster; PURDUE UNIV LAFAYETTE IN DEPT OF BIOMEDICAL ENGINEERING
|
| Much work is needed in the design of more effective bone tissue engineering materials to induce the growth of normal bone tissue. Nanotechnology offers exciting alternatives to traditional bone implants since bone itself is a nanostructured material composed of nanofibered hydroxyapatite well-dispersed in a mostly collagen matrix. For this purpose, poly-lactic-co-glycolic acid (PLGA) was dissolved in chloroform and nanometer grain size titania was dispersed by various sonication powers from 0 ... |
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| Use of Self-Propagating High-Temperature Synthesis Reactions in Refractory Alloy Fabrication |
APR 2005 |
25 pages |
| Authors:
Laszlo J. Kecskes; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The titanium carbide (TiC) self-propagating high-temperature synthesis (SHS) reaction was used in a hot-explosive-consolidation process to fabricate tungsten and molybdenum-based alloy billets. In this method, a Ti+C mixture is reacted to provide a source of heat for the refractory precursor powders. As the TiC reaction proceeds, the exterior of the alloy sample heats up rapidly, near or above 2000 deg C, while its interior lags behind, heating up more gradually ... |
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| Thermal Expansion of Ti-Containing Hydrogenated Amorphous Carbon Nanocomposite Thin Films |
16 SEP 2004 |
4 pages |
| Authors:
B. Shi; W. J. Meng; T. L. Daulton; NATIONAL SCIENCE FOUNDATION WASHINGTON DC
|
| The effective coefficients of thermal expansion (CTE) of Ti-containing hydrogenated amorphous carbon (Ti-C:H) thin films were measured. Ti-C:H thin films with compositions ranging from nearly pure alpha-C:H to nearly pure TiC were deposited on Si(100) substrates. Effective CTEs were determined from temperature induced changes in the curvature of film/substrate assemblies. Measured effective CTE values for Ti-C:H are 5.7 x 10(exp -6) K(exp -1), and show little dependence on the Ti ... |
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| On the Reversibility of Hydrogen Storage in Novel Complex Hydrides |
01 JUN 2004 |
7 pages |
| Authors:
Jun Wang; Armin D. Ebner; James A. Ritter; SOUTH CAROLINA UNIV COLUMBIA DEPT OF CHEMICAL AND ELECTRICAL ENGINEERING
|
| A comparison of the hydrogen release and uptake (cycling) capability of Ti-doped NaAlH4, LiAlH4 and Mg(AlH4)2 as a function of Ti dopant concentration, temperature, pressure, and cycle number is reported. Temperature programmed desorption revealed hydrogen release capacities of around 3 wt% at 140 deg C, 3 wt% at 100 deg C and 6 wt% at 150 deg C, respectively, for the Ti doped Na, Li and Mg alanates. In the ... |
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| The NH3Cl+ Cation |
21 MAY 2004 |
20 pages |
| Authors:
Stefan Schneider; Ralf Haiges; Thorsten Schroer; Jerry Boatz; Karl O. Christe; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| Whereas at least seven simple inorganic cations, NH3F+,1,2 NH2F2+,3 NF4+,4 N2F+,5 N2F3+,6 ONF2+,7 and N3NOF+,8 which contain N-F bonds, have been prepared and well characterized, the existence of corresponding N-Cl containing cations is not well established. Thus, only two N-Cl containing cations, NCl4+9 and ONCl2+,10,11 have been reported, however, our repeated attempts to duplicate their syntheses were unsuccessful, and the crystal structure, published for ONCl2+SbCl6-,10 has been challenged on theoretical ... |
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| Preparation and Characterization of the First Binary Titanium Azides, Ti(N3)4, P(C6H5)4Ti(N3)5 and P(C6H5)42Ti(N3)6 and on Linear Ti-N-NN Coordination |
12 MAR 2004 |
21 pages |
| Authors:
Karl O. Christe; Ralf Haiges; Stefan Schneider; Thorsten Schroer; Jerry A. Boatz; ENGINEERING RESEARCH AND CONSULTING INCHUNTSVILLE AL
|
| Where as numerous partially azide-substituted titanium compounds had previously been reported, 1-7 no binary titanium azides were known. In a recent theoretical study the group 4 metal tetrazides M(N3)4 (M = Ti, Zr, Hf, Th) were predicted 8 to be vibrationally stable exhibiting tetrahedral structures with unique linear M-N-NN bond angles (see Figure 1). All previously characterized covalent binary azide species possess bent M-N-NN angles. In this paper we wish ... |
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| Lightweight, Robust and Low Cost Carbide/Tungsten Composites in Near Net Shapes for Advanced Solid-Fueled Rocket Nozzles for the IHPRPT Program |
FEB 2004 |
64 pages |
| Authors:
Ken H. Sandhage; GEORGIA INST OF TECH ATLANTA SCHOOL OFMATERIALS SCIENCE AND ENGINEERING
|
| The DCP process has been used to synthesize very-high-melting, lightweight tungsten/carbide or tungsten/boride composites via conversion reactions of the following type: (M) + WX(s) = MX(s) + W(s) (1) where (M) is a reactive element dissolved within a Cu-bearing melt, and WX and MX are ceramic reactant and product phases, respectively. Reactions leading to ZrC/W, TiC/W, HfC/W, and ZrB2/W composites at <1300 deg C have been demonstrated. Conversion reactions leading ... |
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| Fundamental Investigations of the Surface Chemistry and Tribology of Metal Carbides and Metal Nitrides |
22 DEC 2003 |
15 pages |
| Authors:
Scott S. Perry; Stephen V. Didziulis; HOUSTON UNIV TX OFFICE OF CONTRACTS AND GRANTS
|
| This research program entailed the investigation of the surface chemical and tribological (friction, lubrication, and wear) properties of titanium carbide (TiC), titanium nitride (TiN), and vanadium carbide (VC). These hard coating materials are potentially useful in enhancing the performance and extending the lifetime of lubricated spacecraft mechanisms. The program sought to establish the fundamental chemical and tribological properties of interfaces involving these materials and to understand the origin of differences ... |
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| (27)Al, (47,49)Ti, (31)P, and (13)C MAS NMR Study oF VX, GB, GD and HD Reactions With Nanosize Al2O3, Al2O3, TiO2, Aluminum And Titanium |
01-Jul-2003 |
|
| Authors:
Shekar Munavalli; George W Wagner; Lawrence R Procell; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
 | Assorted reactions of VX, GB, GD and HD with Al2O3, TiO2 (anatase and rutile), aluminum and titanium metal powders have been studied by 27Al, 47,49Ti, 31P and 13C MAS NMR. VX, GB, GD and HD hydrolyze on both nanosize and conventional Al2O3. A significant droplet size effect on the reaction kinetics is observed. For VX, GB and GD, 27Al and 31P MAS NMR detect the formation of stable, precipitated aluminum ... |
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| Measurement of Stress in Ceramic Laminates With Micro-Raman |
30 JUN 2003 |
8 pages |
| Authors:
Nina Orlovskaya; DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS ENGINEERING
|
| Residual stresses in laminate ceramic composites were measured by micro-Raman spectroscopy. The research proceeded from laminate samples preparation, which included the mixture of powders in certain proportions, grinding them up to submicron dispersity, rolling of the tapes, placing the tapes in a certain order, and hot pressing. Several different ceramic laminates, such as Ti3SiC2-ZrO2, B4C-SiC, and Si3N4-TiN, were used for the determination of residual stresses by micro-Raman. The AlMgB-TiB2 superhard ... |
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| Actuator for Out-of-Plane MEMS Devices |
01 SEP 2001 |
54 pages |
| Authors:
A. D. Johnson; Vikas Gupta; TINI ALLOY CO INC SAN LEANDRO CA
|
| Two major problems from phase I were solved during phase II. The step-coverage problem of TiNi thin film on the polysilicon structure was solved by introducing silicon-on-insulator (SOI) wafers. Also the out-of-plane devices were fabricated completely in-house to eliminate the problem of long turn-around time at the Microelectronics Center of North Carolina (MCNC). In a novel approach, the micromirrors were fabricated from the thin silicon membrane layer of the SOI ... |
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| Comprehensive Visualization of Interface Defeat-Based Ballistic Impact Damage in a Titanium Carbide (TiC) Ceramic Target Disk |
SEP 2001 |
134 pages |
| Authors:
William H. Green; Joseph M. Wells; Nevin L. Rupert; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This study was initiated to demonstrate the feasibility of applying the state-of-the-art nondestructive testing methodology known as x-ray computed tomography (CT) to a ballistic damage assessment. Specifically desired is the capture, digitization, and display, in both two-dimensional (2-D) and three- dimensional (3-D) formats, of the actual mesocracking damage created in bulk ceramic targets following an interface defeat or dwell ballistic impact experiment. Dwell involves the delay, and interface defeat involves ... |
|
| Phase-Locked Fiber Laser Array |
APR 2001 |
18 pages |
| Authors:
Gregg Switzer; ADVR INC BOZEMAN MT
|
| We present a rugged method for controlling the phase of multiple, continuous wave (cw) laser beams using a compact device for coherent addition of radiation. The concept employs an array of electro-optically controlled waveguides in Potassium Titanyl Phosphate (KTP). The phase of each beam is controlled by altering the index of refraction of each waveguide in the array with an individually addressable voltage. A fiber array containing 16 single mode ... |
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| Resilient Composites for Armor Applications |
30 JAN 2001 |
166 pages |
| Authors:
E. R. Strutt; E. A. Olevsky; M. A. Meyers; CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF THE AEROSPACE AND MECHANICAL ENGINEERING SCIENCES
|
| The original objectives of the proposed research were accomplished by H. C. Chen. After the successful completion of his Ph. D. Dr. Chen was employed by CERCOM and used the knowledge gained in his doctoral for the development of armor. He was actively involved in a number of defense projects, including the DARPA Light Weight Armor program coordinated by SwRI. The work in the AASERT proposal was published in Acta ... |
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| Self Assembly of Low-Emissivity Materials (SALEM) |
15 DEC 2000 |
14 pages |
| Authors:
David J. Pine; CALIFORNIA UNIV SANTA BARBARA DEPT OF CHEMICAL AND NUCLEAR ENGINEERING
|
| Self-assembly techniques employing liquid emulsions and colloidal suspensions for the fabrication of photonic crystals are described. To make the photonic crystals, monodisperse emulsion droplets or solid colloidal particles are first allowed to self-assemble into close-packed crystals, having predominately face-centered cubic (fcc) order. Second, the interstices are filled with a high-refractive-index material, usually titania, using either sol- gel chemistry or by compacting nanoparticles. Finally, the templating emulsion droplets or colloidal particles ... |
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| Frequency Difference Generation in the Terahertz Region Using LTG-GaAs Photodetector |
29 SEP 2000 |
4 pages |
| Authors:
E. Peytavit; G. Mouret; J. F. Lampin; P. Masselin; P. Mounaix; UNIVERSITE DU LITTORAL DUNKERQUE (FRANCE) LAB DE PHYSIQUE DES COMPOSANTS DE L'ATMOSPHERE
|
| We demonstrated Terahertz generation by optical frequency difference with a continuous tuning between 0.2 (^ 1 micro W ) and 3 THz (^1 nW). To this aim, high speed photodetectors with an interdigited photoconductor scheme on a submicron scale, loaded by THz log-periodic antennas, were deposited on a 1 micrometer-thick Low Temperature Grown (200 deg C) GaAs epilayer. Two Ti:Sapphire laser beams (^ 30 mW) focused onto the device yield ... |
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| Alkaline Electrochemical Capacitor and Electrode Fabrication |
NOV 1999 |
10 pages |
| Authors:
D. Finello; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE
|
| Highly capacitive (high surface area) electrodes that are electrochemically stable in strong alkaline electrolyte will form the basis for a new generation of electrical and electrochemical energy storage and conversion devices. A new type of electrochemical capacitor is described in addition to procedures for making the required electrodes. The subject low cost alkaline electrochemical capacitor designs are based upon titanium nitride electrodes which exhibit 125 ... |
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| Laminated Matrix Composites - A New Class of Materials |
28 OCT 1999 |
51 pages |
| Authors:
W. J. Lackey; Elliot Pickering; Harry King; Stephen Crain; Mark Renier; GEORGIA INST OF TECH ATLANTA SCHOOL OFMECHANICAL ENGINEERING
|
| A new type of composite, which consists of a reinforcement phase plus a matrix composed of many alternate thin layers of two different materials, has been prepared. CVI appears to be an appropriate process for the fabrication of this class of materials. We have successfully fabricated such a composite using the forced flow-thermal gradient CVI process. A carbon 2-D cloth preform was infiltrated with alternate layers ... |
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| A Novel Manufacturing Processing Route for Forming High-Density Ceramic Armor Materials: Phase II- SBIR |
APR 1999 |
104 pages |
| Authors:
Rams V. Raman; CERACON INC SACRAMENTO CA
|
| The feasibility of a combustion synthesis/Ceracon forging (CS/CF) fabrication process for low-cost high-quality ceramic armor is demonstrated. CS of titanium (Ti) and carbon (C) forming titanium carbide (TiC) was followed by a quasi-isostatic pressurization and densification to produce tiles with 95% + densities with sizes of up to 15 cm x 15 cm x 2.5 Cm. Several tiles were fabricated and delivered to the U.S. Army Research Laboratory (ARL) for ... |
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| Nanocrystalline Processing and Interface Engineering of Si3N4-based Nanocomposites |
01 OCT 97 |
8 pages |
| Authors:
Jackie Y. Ying; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING
|
| This report describes the microstructural characterization of nanocrystalline titanium nitride (TiN) produced in our forced flow reactor. Microscopy studies of TiN densified through a pressureless sintering process show a consistent ultrafine microstructure with grains of 140 nm and no glassy intergranular or secondary phases. Comparison of TiN ceramics processed by different methods demonstrates that there is a clear benefit to avoiding exposure of the starting powders to air, but that ... |
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| Boundary Effects in High-Tc Superconducting |
DEC 96 |
4 pages |
| Authors:
A. Kapitulnik; STANFORD UNIV CA
|
| This work examines the thermal boundary resistance between high-Tc superconducting films and insulating substrates. In particular we compare c-axis and a-axis films and different oxygen stoichiometries. Comparison of c-axis films shows very little temperature dependence; a-axis films show strong temperature dependence from 100 K to room temperature. This temperature dependence disappears upon reducing the oxygen content of the films. |
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| Bio-Mimetic Composites for Electrical and Optical Properties. Revised |
10 MAY 96 |
19 pages |
| Authors:
Paul Calvert; Dunbar Birnie; Neil Mendelson; ARIZONA UNIV TUCSON COLL OF ENGINEERING AND MINES
|
| Polymer films containing non-centrosymmetric crystals have been prepared and characterized by second harmonic generation. Combinations of water- soluble polymers and KDP or ADP produced good films. Efforts were made to extend this method to lead titanate, lead zirconate titanate and potassium titanyl phosphate. These materials were successfully produced as crystalline thin films via sol-gel chemistry with a high temperature annealing step. Composite films could be produced of these materials in ... |
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| PC-Based DAtabase on the Properties of Intermetallic Alloys: Aluminides, Silicides, Beryllides, and Miscellaneous Compounds. |
JAN 1996 |
|
| Authors:
METALS INFORMATION ANALYSIS CENTER WEST LAFAYETTE IN
|
| File characteristics: Program and database (1 file); Binary character set. Physical description: 1 computer diskette; 3 1/2 in.; high density; 1.4 MB. System requirements: PC compatible; DOS. This PC-based database on the properties of intermetallic alloys is the result of a systematic program to compile and evaluate thermophysical and mechanical properties of intermetallic alloys. Over 200 documents have been reviewed and the data from these documents have been captured and ... |
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| PC-Based Database on Properties of Intermetallic Alloys |
JAN 96 |
|
| Authors:
METALS INFORMATION ANALYSIS CENTER WEST LAFAYETTE IN
|
| This pc-based database on the properties of intermetallic alloys, is the result of a systematic program to compile and evaluate thermophysical and mechanical properties of intermetallic alloys. Over 200 documents have been reviewed and the data from these documents have been captured and evaluated. The data are fully referenced and each data set is characterized with respect to alloy composition, microstructure, heat treatment, test methods, and test conditions when possible. ... |
|
| High-Thermal-Conductivity AIN Packages for High-Temperature Electronics |
SEP 95 |
56 pages |
| Authors:
E. Savrun; M. Sarikaya; T. P. Pearsall; QUEST INTEGRATED INC KENT WA
|
| A novel metallization for aluminum nitride substrates to package silicon carbide integrated circuits for use at temperatures of 600 deg C and above was investigated. Chemical equilibrium calculations were used to determine the chemical compatibility of several refractory and transition metal disilicides with AlN and SiC. Tungsten disilicide, niobium disilicide, and titanium disilicide were selected for diffusion couple and thin film deposition studies. AlN-WSi2-SiC, AlN-NbSi2-SiC, and AlN-TiSi2-SiC diffusion couples were ... |
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| Gas Phase Studies of Boron, Silicon, and Aluminum -- Relationship to Carbon-Carbon Composition |
27 JUN 95 |
24 pages |
| Authors:
R. Damrauer; V. M. Bierbaum; M. S. Gordon; M. Krempp; M. Stephan; COLORADO UNIV AT DENVER
|
| Work on a number of boron hydride anions and cations has been carried out using the unique features of flowing afterglow-selected ion flow tube (FA- SIFF) technology. Reaction of strong base with diborane has allowed the preparation of a number of anionic boron hydride clusters. Many of these including B2H3- have been examined in terms of their reaction chemistry (FA- SIFF) and structure (ah initio computation). The fundamental thermodynamic property ... |
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| High Power Broadly Tunable Piscosecond IR Laser System for Use in Nonlinear Spectroscopic Applications |
12 JUN 95 |
14 pages |
| Authors:
D. E. Gragson; D. S. Alavi; G. L. Richmond; OREGON UNIV EUGENE DEPT OF CHEMISTRY
|
| A picosecond laser system which will generate high power tunable IR pulses with bandwidths suitable for spectroscopic applications is discussed. The system is based on white light continuum generation in ethylene glycol and optical parametric amplification in potassium titanyl phosphate. The non-linear optical processes are driven by a regeneratively amplified Ti:sapphire laser which produces 1.7 ps pulses at a repetition rate of 1 kHz. Energies as high as 40 microJ ... |
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| Mechanical Performance of Fiber Reinforced Metal Matrix Composites and Microstructural Development of Polycrystalline Alumina Fibers Synthesized from Liquid Precursors |
31 DEC 94 |
8 pages |
| Authors:
A. G. Evans; F. Zok; C. G. Levi; F. F. Lange; CALIFORNIA UNIV SANTA BARBARA
|
| The research of the Office of Naval Research grant at UCSB focused on the research concerns of mechanical properties of fiber reinforced metal matrix composites as well as the understanding of microstructural development in polycrystalline Al2O3 fibers synthesized from liquid precursors. It has been closely coordinated with the DARPA/ONR URI program dealing with the design of high performance composites. |
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| Dual Adsorption on Negatively Charged Surfaces in Non-Aqueous Media |
1994 |
9 pages |
| Authors:
K. M. Hurysz; J. K. Cochran; K. J. Lee; T. H. Sanders Jr.; J. L. Clark; GEORGIA INST OF TECH ATLANTA SCHOOL OFMATERIALS SCIENCE AND ENGINEERING
|
| Titanium hydride powders with negatively charged surfaces cannot be dispersed by anionic polymers. Using low dielectric constant liquids further complicates dispersion by increasing surface charge while reducing the charge at the shear layer. It is possible to provide stabilization by employing two polymers that reverse and increase the magnitude of the surface charge. The same non-ionic polymer can then be used in the steric dispersion of both negatively and positively ... |
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| Combustion Synthesis of TiB and TiB2 Under Vacuum. |
1994 |
|
| Authors:
S. K. Roy; A. Biswas; BHABHA ATOMIC RESEARCH CENTRE BOMBAY (INDIA)
|
| This letter describes the results of the synthesis of titanium monoboride and diboride by combustion synthesis in vacuum using plane wave propagation. Titanium borides were chosen because of the interest, both scientific and technological, in these materials for refractory, abrasive and electrochemical applications. These borides are candidate materials for a variety of applications including hard metal cutting tools, vacuum metalization boats, grain refining agents in aluminum, cathodes in the electrolytic ... |
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| Three-Wave Nonlinear Interactions in KTiOPO4 (KTP) and KTP Isomorphs |
14 SEP 93 |
119 pages |
| Authors:
Dale L. Fenimore; Kenneth L. Schepler; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| This document reports an investigation of three-wave interactions in positive (nonlinear) biaxial crystals-specifically, the crystal KTiOPO4 (KTP) and its crystallographic isomorphs: RbTiOP04 (RTP), KTiOAs04 (KTA), RbTiOAs04 (RTA), and CsTiOAsO4 (CTA). The results are characterized in terms of phase matching angles, effective nonlinear coefficients, and walkoff angles for the optical beams. In phase matching angles, RTP and CTA showed larger variations in theta (i.e., were more birefringent) than the other isomorphs ... |
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| Deposition Rates of Titanium Nitride Plates Prepared by Chemical Vapour Deposition of TiCl4+NH3 System. |
1993 |
|
| Authors:
C. C. Jiang; T. Goto; T. Hirai; TOHOKU UNIV SENDAI (JAPAN)
|
| Titanium nitride plates (TiN(x') x=0.75=1.0, about 2 mm thick maximum) were prepared by chemical vapor deposition (CVD) using TiCl(4), NH3 and H2 as source gases. The effects of CVD conditions, i.e., gas molar ratio (m(N/Ti)=NH3/TiCl4 and deposition temperature (T(dep), on deposition rates and surface morphology were examined, and the deposition mechanism of the CVD-TiN(x) plates was discussed. The relationship between m(N/Ti) and deposition rates showed a maximum peak at certain ... |
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| Microstructure and Properties of the Sintered Composite Prepared by Hot Pressing of TiN-Coated Alumina Powder. |
1993 |
|
| Authors:
H. Itoh; H. Sugimoto; H. Iwahara; J. Otsuka; S. Iio; NAGOYA UNIV (JAPAN)
|
| Alumina powders (average grain size: 50 micron) coated with TiN film of thickness 0.5 and 1.2 micron were prepared by rotary powder-bed chemical vapor deposition for 15 and 90 min, respectively. These Al2O3 - TiN composite powders were hot-pressed at 1800 C and 40 MPa for 30 min. The microstructure of the Al2O3 - TiN sintered composite was composed of a TiN network homogeneously distributed on the grain boundaries of ... |
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| Properties of TiN, ZrN and ZrTiN Coatings Prepared by Cathodic Arc Evaporation. |
1993 |
|
| Authors:
J. Musil; I. Stepanek; J. Musil Jr.; M. Kolega; O. Blahova; RESERVED SOURCE
|
| The paper is devoted to the reactive deposition of TiN, ZrN and ZrTiN coatings prepared by a cathodic arc ion-plating process. Cathodes made of Ti and Zr were evaporated in an N2 atmosphere. ZrTiN coatings were created by simultaneous evaporation of both Ti and Zr. Typical operation characteristics of individual depositions are presented. Special attention is devoted to the coating properties, namely to the film microstructure, surface morphology, phase and ... |
|
| Reactivity of Nitrogen in Titanium Nitride Film Formation by the Reactive Ion Plating Process. |
1993 |
|
| Authors:
Y. Matsumura; T. Chujo; H. Uchida; H. H. Uchida; TOKAI UNIV HIRATSUKA (JAPAN)
|
| The reactivity of N2 gas molecules with Ti atoms (neutral and /or ion) in TiN film formation has been measured quantitatively. The reactivity of N2 is expressed using the reaction probability of N2, which is defined as the ratio of the rate of N2 adsorption or absorption by Ti to the rate of impingement. Increasing the fraction of Ti ions in all the evaporated Ti from 2.7 x10-3 to 0.26 ... |
|
| JPRS Report, Science & Technology, Japan, Ceramics Society of Japan 1992 Meeting |
22 DEC 92 |
|
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| Partial contents: Preparation of SrTiO3-Based High Dielectric Films by Sol-Gel Processing; Preparation, Dielectric Properties of Bi4Ti3O12 Thin Films by Sol-Gel Process; Synthesis of Perovskite Pb(Ni1/3Nb2/3)O3 by Sol-Gel Process; High-Resolution Electron Microscopy of Hot-Pressed Si3N4-SiC nanocomposite Materials; High-Pressure Hot Pressing of TiC Using SHS Reaction; Reinforcing Al2O3/TiC Nanocomposites by ZrO2; Observation of Microstructure, Dislocation of Al2O3/SiC Nanocomposites. |
|
| Advanced Electronic Structures |
OCT 92 |
|
| Authors:
Mark van Schilfgaarde; SRI INTERNATIONAL MENLO PARK CA
|
| Contents: Schottky Barriers and Defects, Fullerene T(8)C(12), In TISb as an Infrared Detector, Magnetic Multilayers, and Defects in HgCdTe. |
|
| Titanium Carbide-Graphite Composites |
08 NOV 91 |
75 pages |
| Authors:
Delwyn Cummings; ADVANCED TECHNOLOGY MATERIALS INC DANBURY CT
|
| Pure titanium carbide, titanium carbide with free graphite, titanium carbide/vanadium carbide alloy with free graphite, and titanium carbide with boron and free graphite were tested for friction and wear at 22,600, and 900 C. Test pins of the four compositions were machined from ignots prepared from melts. The test pins were drawn across hot pressed titanium carbide wear plates with 5 newtons of normal force. The lowest friction coefficient at ... |
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| MRP Application in a Small Manufacturing Company. |
JUN 1991 |
|
| Authors:
G. Torzadeh; N. Sharma
|
| Today, international competition, rapidly changing technology, energy shortages, government regulations, and other factors are serious challenges to manufacturing firms. Many manufacturing companies are in a price-cost squeeze, as a result of which increasing attention is being given to the contol of internal operations to improve profits. Effective operating information is essential to assist management in daily decision making to maximize customer services, to maintain efficiency, and to minimize total investment. ... |
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| The Industrial Engineer as a Robot Project Manager Can Increase Productivity. |
JUN 1991 |
|
| Authors:
J. E. Koop
|
| Robotics today are dominated by industrial applications where simple, repetitive tasks are performed reliably at relatively low cost. The need for high reliability has forced designers to be conservative in the integration of modern technologies. An enormous opportunity for technical growth exists. The critical issue is how the robot designer will take advantage of advanced electronic technologies to produce generic and more versatile mechanical robots at lower cost. It has ... |
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| The Role of Measurement In Achieving World Class Quality and Productivity Management. |
JUN 1991 |
|
| Authors:
D. S. Sink
|
| Measurement is a mystery. Most people who attack the task of developing measurement systems eventually come to this conclusion. Even those who are considered experts readily admit that measurement is complex and still an unresolved mystery. Measurement is complex, frustrating, difficult, challenging, important, abused and misused. Measurement at the individual, group, and organizational levels has tremendous problems, as well as opportunities associated with it. We are going to take some ... |
|
| Very High Temperature Fibers of TiC and TiB2 |
MAY 91 |
|
| Authors:
Richard G. Schlecht; LASERGENICS CORP SAN JOSE CA
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| The purpose of this work is to demonstrate the value of single crystal fibers of titanium carbide and titanium boride as fibers for strengthening elements in matrix composite materials. LaserGenics has used the laser-heated pedestal-growth technique to grow short lengths of these materials in fiber form. We were not able to reduce the oxygen content in the growth chamber to a low enough of a level that would ensure single ... |
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| Short Reports: Reaction of Titanium Tetrachloride with Alcohols in the Presence of Ammonia and Pyridine |
07 MAR 91 |
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| Authors:
O. V. Nogina; R. Kh. Freydlina; A. N. Nesmeyanov; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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| Titanium tetrachloride does not form even during prolonged boiling with alcohols of orthoesters; the reaction stops at the stage of formation of dialkoxytitaniumdichlorides. During reaction with phenols, titanium tetrachloride is converted into diarylhydroxytitaniumdichloride or aryl- hydroxytitaniumtrichloride, depending on the nature of the initial phenol. For bringing the reaction between titanium tetrachloride and alcohols to the stage of the formation of orthoesters, it is necessary to withdraw the resultant hydrogen chloride ... |
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| The Effect of Titanium Inclusions on HY-80 GMA Weld Deposits |
DEC 1990 |
79 pages |
| Authors:
Dana J. Ellis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| HY-80 steels are used in submarine and ship construction and it has been found that small additions of titanium to this steel during manufacture markedly improve the fracture toughness of the heat affected zone (HAZ) of Gas- Metal-Arc-Welding (GMAW) deposits made from this steel. This has been ascribed to prior austenite grain boundary pinning by titanium nitride inclusions. In the present work the weld metals, HAZ and parent metals of ... |
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| Design and Manufacture of Advanced Thermoplastic Structures (DMATS). |
DEC 1990 |
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| Authors:
R. L. Ramkumar; NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV
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| Fabrication of Intermetallic Compounds by Solid State Reaction of Roll- Bonded Materials |
09 NOV 90 |
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| Authors:
Steven G. Fishman; MARTIN MARIETTA ASTRONAUTICS GROUP DENVER CO
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| Synthesis of Organic Compounds (Selected Articles) |
03 OCT 90 |
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| Authors:
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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| Synthesis is realized in essence as described for ethyl- orthotitanate. Into a three-necked round-bottomed flask with a capacity of 500 ml equipped with dropping funnel, reflux condenser and tube for the introduction of ammonia, are placed 102 g (1.75 g-mols) of thoroughly dried out allyl alcohol, which boils at 96-97 and 250 ml of absolute benzene (see note). Cooler and dropping funnel are connected with the drying tubes. From dropping ... |
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TITANIUM COMPOUNDS
