| Assessment of a Failure Probability Prediction Technique for Ceramic Heat Exchanger Components, |
FEB 1985 |
|
| Authors:
K. O. Smith; R. B. Poeppel; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
 | A study was conducted to establish analytical design techniques for predicting the failure probability of ceramic heat exchanger components. Three test specimen geometries representing subscale components of an axial flow, tubular ceramic heat exchanger were selected for evaluation. Failure probability predictions for the specimens subjected to mechanical loads were made using finite element stress and two-parameter Weibull analyses. Weibull parameters for sintered alpha-SiC were determined using as-sintered flexure bars in ... |
|
| Evaluation of Cast Titanium Alloy Compressor Components. Volume I |
NOV 1981 |
84 pages |
| Authors:
Alvin N. Hammer; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
 | The objective of this program was to characterize the properties of cast titanium alloy compressor impellers to provide a background for design, processing, and qualification for service in the Solar T62T-40 Titan auxiliary power unit and similar small radial gas turbine engines. Four titanium alloy investment casting foundries participated in the production of straight vane test wheels, a low-cost representation of the compressor impellers. As-cast and hot isostatic pressed (HIPed) ... |
|
| Erosion Mechanisms of Metals |
NOV 1981 |
|
| Authors:
Kenneth G. Kubarych; Mary E. Gulden; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The objective of this program is to identify the material properties which control erosion, as well as the material removal process. Based on previous experimental work, an erosion model has been hypothesized and is based on the target stress-strain response beneath the impacting particle. At low particle energies only elastic strain is generated and no damage to the target occurs. At higher energies, the peak stresses increase, leading to brittle ... |
|
| Isothermal Shape Rolling of Titanium Alloys |
81 |
|
| Authors:
A. Saith; R. Zandonella; J. R. Woodward; A. G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Isothermal rolling is an emerging process based on use of local electrical resistance heating with molybdenum alloy rolls or dies. A process is being established for manufacture of a T-section component for the F-18 aircraft, starting from rectangular barstock. Sheet Rolling and Ring Rolling processes have been developed. Roll forge dies are used in another process to manufacture compressor blades for the T55 engine. |
|
| Internal Coating of Air-Cooled Gas Turbine Blades |
DEC 80 |
|
| Authors:
L. L. Hsu; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Four modified aluminide coatings were developed for IN-792 + Hf alloy using a powder pack method applicable to internal surfaces of air-cooled blades. The coating compositions are Ni-19Al-1Cb, Ni-19Al-3Cb, Ni-17Al-20Cr, and Ni- 12Al-20Cr. Cyclic burner rig hot corrosion (900 C) and oxidation (1050 C) tests indicated that Ni-Al-Cb coatings provided better overall resistance than Ni-Al- Cr coatings. Tensile properties of Ni-19Al-1Cb and Ni-12Al-20Cr coated test bars were fully retained at ... |
|
| Joining of Ceramics for High Performance Energy Systems |
01 OCT 80 |
|
| Authors:
C. E. Smeltzer; A. G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The subject program is primarily an exploratory and demonstration study of the use of silicate glass-based adhesives for bonding silicon-base refractory ceramics (SiC and silicon nitride). The projected application is 1250-2050 F relaxing joint service in high-performance energy conversion systems. |
|
| Combined Cycle Steam Generator Gas Side Fouling Evaluation. |
SEP 1980 |
|
| Authors:
P. B. Roberts; A. J. Kubasco; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Liquid-fueled gas turbines can produce serious steam generator fouling in gas turbine combined cycle applications and other waste heat recovery systems as a result of combustion system generated soot particles. In addition, standard soot blowing practices are not always compatible with the advanced, compact matrix designs sometimes required for minimum package size applications. In Phase I, an experimental program was conducted on both test rigs and engine hardware designed to ... |
|
| Study of Erosion Mechanisms of Engineering Ceramics, Static Fatigue of Ceramics. |
31 JUL 1980 |
|
| Authors:
Mary Ellen Gulden; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Two areas were investigated in this program: solid particle erosion of engineering ceramics and static fatigue of ceramics. In the erosion phase, the target materials investigated were several types of Si3N4, glass bonded Al2O3 and magnesium fluoride. The particle types were SiC and natural quartz sand. Particle sizes ranged between 10 and 1000 microns and particle velocities were in the subsonic regime. The particle size and velocity dependence on erosion, ... |
|
| Development of a Ceramic Tube Heat Exchanger with Relaxing Joint |
JUN 80 |
|
| Authors:
M. E. Ward; N. G. Solomon; M. E. Guiden; C. E. Smeltzer; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The successful operation of the full size ceramic heat exchanger above 1150 C (2100 F) outlet temperatures at 689 kPa (100 psi) with firing temperatures at 1370 C (2500 F) must be considered the major achievement of this project. The primary technology development that enabled the fabrication of the full size ceramic tube heat exchanger test module was in the area of joining. Three types of ceramic joints were investigated ... |
|
| Manufacturing Process Development for Dust and Rain Erosion Resistant Coated Metallic Clads for Helicopter Rotors |
JUN 1980 |
183 pages |
| Authors:
David P. Huey; Alvin R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Manufacturing processes for creating erosion resistant coatings on metallic rotor blade leading edges were optimized as a follow-on to a coating development program sponsored by AMMRC (Contract DAAG74-C-0054). Solide coated, titanum rotor nose caps were produced in sections up to 30 inches long. Commercially pure (A75) and alloyed (Ti-6Al-4V) titanium was used. Newly developed graphite coating mandrels made possible simultaneous coating and creep forming of titanium sheet material to accurate ... |
|
| Isothermal Roll Forging of T55 Compressor Blades. Phase II. |
JUN 1980 |
|
| Authors:
Fred K. Rose; Arthur G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The objective of Phase II of this manufacturing technology program was to produce the 2nd stage blade of the Avco T-55 engine for static evaluation using the isothermal roll forge process. Blades were produced in AM-350 alloy using two roll-forge passes of the energy efficient, microprocessor controlled process. The blades met the fatigue, tensile and metallurgical requirements of Avco specifications. (Author) |
|
| Complex, Precision Cast Columbium Alloy Gas Turbine Engine Nozzles Coated to Resist Oxidation. |
APR 1980 |
|
| Authors:
Lulu Hsu; W. G. Stevens; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The objectives of this program were to produce investment cast single vane nozzle segments in C129Y alloy (Nb-10Hf-10W-0.3Y) and to coat these vanes with the NS-4 (50W-20Mo-15Ti-10V) silicide coating. Initially, both cored and solid vane segments were specified but due to problems experienced in the consumable arc process, cored vanes were deleted from the program scope. Several problems developed. The electrode material supplied was low in yttrium, which might have ... |
|
| Development of Polyimide Materials for Use in Solar Energy Systems. |
80 |
|
| Authors:
A. L. Wilcoxson; U. A. Sorathia; J. Gagliani; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Work efforts on a program to optimize and characterize improved insulation materials for solar energy systems are reported. Two separate and distinct products were studied, a lightweight flexible insulating foam and a high density, rigid, load bearing insulating foam, both derived from a polyimide resin. These materials are non-burning and do not emit measurable quantities of smoke or toxic by-products. Characterization parameters were established for the flexible insulating foam in ... |
|
| Thick Ceramic Coating Development for Industrial Gas Turbines--A Program Plan |
DEC 79 |
|
| Authors:
J. W. Vogan; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| A program plan was presented on a NASA-Lewis funded program in which effectiveness of thick ceramic coatings in preventing hot corrosion and in providing thermal insulation to gas turbine engine components will be investigated. Preliminary analysis of the benefit of the thermal insulating effect of this coating on decreasing cooling air and simplifying component design appears very encouraging. The program is in the preliminary stages of obtaining starting materials and ... |
|
| Advanced Ceramic Material for High Temperature Turbine Tip Seals |
NOV 79 |
|
| Authors:
J. W. Vogan; N. G. Solomon; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Forty-one material systems were evaluated for potential use in turbine blade tip seal applications at 1370 C. Both ceramic blade tip inserts and abradable ceramic tip shoes were tested. Hot gas erosion, impact resistance, thermal stability and dynamic rub performance were the criteria used in rating the various materials. Abradability testing was conducted at selected blade tip speeds and interference rates over a temperature span of ambient to 1370 C. ... |
|
| Development and Evaluation of Processes for Deposition of Ni/Co-Cr-Aly (MCrAly) Coatings for Gas Turbine Components. |
SEP 1979 |
|
| Authors:
L. Hsu; W. G. Stevens; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The application of MCrAlY (M = Ni or Co or Ni + Co) coatings to high-temperature turbine blades and vanes is primarily provided by the electron beam, physical vapor deposition (PVD) process. Two major drawbacks of the PVD MCrAlY coating are high cost and line-of-sight (LOS) limitation. The controlled composition reaction sintered (CCRS) MCrAlY process was developed as a cost-effective, non-LOS alternative to the PVD coating process. The objective of ... |
|
| Study of Surface Reaction of Impacted Chlorides on Marine Gas Turbine Hot Corrosion at Low Power Conditions. |
SEP 1979 |
|
| Authors:
E. R. Duffy; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Because of the importance of Na2SO4 and its reaction with the substrate in hot corrosion attack on superalloys, the amount of this compound formed from NaCl and sulfur oxides is extremely important in determining hot corrosion potential. The objective of this program was to determine the influence of surfaces on the kinetics of the conversion of NaCl and MgCl2 to Na2SO4 and MgSO4, respectively, in a typical combustion environment. (Author) ... |
|
| Combined Cycle Steam Generator Gas Side Fouling Evaluation. Phase 1. |
JUL 1979 |
|
| Authors:
P. B. Roberts; A. J. Kubasco; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Liquid-fueled gas turbines can produce serious steam generator fouling in gas turbine combined cycle applications and other waste heat recovery systems as a result of combustion system generated soot particles. In addition, standard soot blowing practices are not always compatible with the advanced, compact matrix designs sometimes required for minimum package size applications. This report describes an experimental program conducted on both test rigs and engine hardware designed to evalaute ... |
|
| INTERNALLY COATED AIR-COOLED GAS TURBINE BLADING |
MAR 79 |
|
| Authors:
L. Hsu; W. G. Stevens; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| the increasing use of air-cooled blading in advanced, high- temperature engines requires that technology is available for application of protective coatings to internal cooling air passages to minimize oxidation/hot corrosion attack. in this program, ten candidate modified nickel-aluminide coatings were developed for this purpose using the slip pack process. these coatings contain additives such as silicon, chromium and columbium in a nickel- aluminum coating matrix with directionally solidified mar-m200 plus ... |
|
| Effects of Gas Turbine Combustion on Soot Deposition. |
MAR 1979 |
|
| Authors:
D. J. White; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The effects of premixing the reaction air and fuel of a gas turbine combustor on soot formation were investigated. Other parameters such as pressure, temperature and reaction zone fuel-air ratio were also evaluated. Soot formation was found to be dominated by fuel-air premixing and could be suppressed readily through a partial premix process. (Author) |
|
| Study of Erosion Mechanisms of Engineering Ceramics. |
MAR 1979 |
|
| Authors:
Mary Ellen Gulden; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| A MgF2 target was subjected to impact conditions from single particle to 10 to the 10th power impacts which simulated a natural dust environment (quartz particles) in the subsonic velocity regime. The function of particle size and velocity predicted by the 'elastic-plastic' impact model is followed for this system. Impact damage is characterized by a heavily deformed contact area between particle and target, with radial cracks propagating outward from the ... |
|
| Application of Ceramic Nozzles to 10 kW Engine. |
DEC 1978 |
|
| Authors:
James C. Napier; A. G. Metcalfe; T. E. Duffy; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Work on application of ceramics to the nozzle section of the small radial MERADCOM 10KW gas turbine engine for meeting the two separate goals of improved erosion resistance and increased turbine inlet temperature is reported. Engine demonstrations of each of the two ceramic nozzle designs were completed. Efforts leading to engine demonstrations are documented and included; ceramic materials properties studies; design studies; engine simulator experiments for high temperature erosion, corrosion ... |
|
| DEVELOPMENT OF A CERAMIC TUBE HEAT EXCHANGER WITH RELAXING JOINT |
15 APR 78 |
|
| Authors:
M. E. Ward; J. C. Napier; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The contract includes materials studies and engineering analysis on a silicon-base ceramic tube heat exchanger. The results from these analysis and test evaluations will be applied to the design of a heat exchanger module. The module will be tested under conditions simulating typical heat exchanger conditions. |
|
| Isothermal Roll Forging of T55 Compressor Blades. |
DEC 1977 |
|
| Authors:
Fred K. Rose; Arthur G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The objective of this manufacturing technology program was to demonstrate feasibility to produce T55 compressor blades by isothermal roll forging within 0.010 inch of drawing tolerances. This objective was accomplished through process definition and application to blades in Ti6Al4V for proofing and in AM- 350 steel for the T55 engine. Satisfactory structure and mechanical properties were achieved in AM-350 steel after isothermal rolling. Cost analyses showed good potential for progressive ... |
|
| Test Evaluation of Stationary and Rotating Diffusers for a High Pressure Ratio Radial Compressor. |
OCT 1977 |
|
| Authors:
Colin Rodgers; Lee Blinman; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The design of a free rotating vaneless/vaned diffuser (F.R.D.) for a nominal 1.9 pps, high pressure ratio, single stage radial compressor was completed, together with a comparative conventional stationary vaneless/vaned optimum channel diffuser. Both types of diffuser were subsequently fabricated and individually installed in an existing turbodrive compressor rig for comparative performance evaluation. At 100% corrected design impeller speed, equal to 62,000 rpm, the peak pressure ratio and adiabatic efficiency ... |
|
| Study of Erosion Mechanisms of Engineering Ceramics. |
AUG 1977 |
|
| Authors:
Mary Ellen Gulden; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Four 'engineering' ceramics were subjected to impact (single particle) and erosion (multiple impacts) under conditions which simulate a natural dust environment in the subsonic velocity regime. The target materials are hot pressed Si3N4, reaction bonded Si3N4, glass bonded Al2O3 and hot pressed MgF2. Tests were performed with 6 narrow size ranges of natural quartz between 10 and 385 microns average, and 5 velocities for each particle size. Hot pressed Si3N4 ... |
|
| Radiation Pyrometer for Gas Turbine Blades. |
SEP 1972 |
|
| Authors:
David A. Rohy; W. A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| This report describes the results of a program that has advanced the concepts and feasibility of radiation pyrometry for measuring the first stage blade temperature in advanced aircraft turbine engines. In this system thermal radiation is accepted from the blades by sensor heads transmitted by high temperature fiber optics to a remote detector housing, and converted into an electrical signal by a silicon photovoltaic cell. This system measures and displays ... |
|
| Analytical, Experimental and Mechanical Evaluation of Free Rotating Vaneless Diffusers |
MAY 1972 |
106 pages |
| Authors:
C. Rodgers; H. Mnew; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Experimental testing of a model free rotating vaneless diffuser rig to determine diffuser loss coefficients and static pressure recovery under braked and free rotating conditions was conducted. The rig was operated at entry Mach numbers up to unity with both vaned and vaneless diffusers installed downstream. Two rotating diffuser widths were tested. A significant improvement in diffuser performance was achieved under free rotating conditions, even though large wakes generated by ... |
|
| Tungsten Reinforced Oxidation Resistant Columbium Alloys |
FEB 1972 |
88 pages |
| Authors:
Mark J. Klein; Brad R. Domes; Arthur G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| High-strength, oxidation-resistant composites are being developed for use in gas turbine engines at temperatures exceeding 2000F. In previous work a model system composite consisting of a CB-40Ti-9Cr-4Al matrix and W-3Re filaments was developed and tested. During the present period, testing of the model system was continued to further characterize this material. In addition, the matrix composition was modified to improve composite ductility. The improved matrix selected for use in the ... |
|
| Hot Corrosion of Coated Superalloys in a Gas Turbine Environment. |
15 DEC 1970 |
266 pages |
| Authors:
Victor S. Moore; Alvin R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The final results of a hot corrosion rig test evaluation of 45 coating-alloy combinations are presented. Alloys included in the program were B1900, 713C, IN-100, Rene' 41, SEL-15, U-700, U-710, MAR-M-246, WI-52 and X-40. Rig tests were performed for up to 150 hours at 1650F and 1800F on nickel-base alloys and 1800F and 2000F on cobalt-base alloys in a high-velocity environment obtained from the combustion of JP-5 fuel and air ... |
|
| Study of the Mechanisms of Sand and Dust Erosion. |
DEC 1970 |
100 pages |
| Authors:
Iain Finnie; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The fundamental mechanisms by which erosion occurs in brittle solids have been examined. The erosion process in brittle solids is studied by considering the extent to which a single impacting particle produces fracture in the surface of a brittle solid. By drawing on recent work on the location of fracture in brittle solids, it is possible to predict the effect of such variables as eroding particle size and velocity, angle ... |
|
| Compatibility Studies for Viable Titanium Matrix Composites. |
SEP 1970 |
|
| Authors:
Gunther K. Schmitz; Mark J. Klein; Mike L. Reid; Arthur G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Two titanium alloys have been developed with 100 and 600 times the compatibility for boron over that of unalloyed titanium. The compositions are: Ti(13-10) - Ti-13V-10Mo-5Zr-2.5Al, and Ti(22-3) - Ti-22V-3W-5Zr-2.5Al. The annealed alloys are beta solid solutions that have been developed with desirable properties for a composite matrix. Ductilities are excellent, strengths are not less than 130,000 psi, proportional limits are high at room temperature, and alloy stability appears adequate ... |
|
| Mechanisms of Sand and Dust Erosion in Gas Turbine Engines. |
AUG 1970 |
298 pages |
| Authors:
Charles E. Smeltzer; Mary E. Gulden; Scott S. McElmury; William A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The approach to solving the problem of dust erosion has been to study the mechanics of erosion (i.e., the actual physical events occurring at the erosion surface) as a logical means of identifying the properties of the blade (target) material and the dust suspension that control the erosion processes. This erosion mechanism study is outlined and discussed in the report. |
|
| Research Analysis of Advanced Sensors for Turbine Inlet Gas Temperature. |
JUL 1970 |
|
| Authors:
T. E. Duffy; M. I. Seegall; S. S. McElmury; J. C. Napier; W. A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The final report describes results of a program to perform a comprehensive research analysis of the various advanced methods of sensing and providing an electrical signal for controlling the Turbine Inlet Gas Temperature (TIGT) of advanced gas turbine engines and recommends three methods which appear most promising for further development. Phase I completed the literature search, concept definition and selection, engine interface constraints definition, and performance objectives of the system. ... |
|
| Radiation Pyrometer for Gas Turbine Buckets. |
JUN 1970 |
|
| Authors:
Thomas E. Duffy; W. A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The report describes the results of a program that has demonstrated the practical feasibility of radiation pyrometry for gas turbines. Several sensor heads capable of interfacing with the severe environments of advanced turbojets were tested at sensor head temperatures of 1000F. Two basically different configurations of high environmental temperature sensor heads were used to identify target areas on blades and collect radiation from each blade as it passes across the ... |
|
| A Study of Stress Corrosion of Glass Fibers. Part II. Effect of Glass Composition. |
FEB 1970 |
|
| Authors:
Gunther K. Schmitz; Mary Ellen Gulden; Arthur G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| This study represents a continuation of work to determine the mechanism of stress corrosion controlled failure of glass filaments under tensile, static fatigue or other loading conditions. Glass filaments were prepared from six modified E-glasses and compared with standard E-glass. Tensile and static fatigue tests wre performed in air and liquids of different pH. Tests were made at different strain rates and temperatures to determine time-and temperature-dependence the steess corrosion ... |
|
| Tungsten Reinforced Oxidation Resistant Columbium Alloys. |
JAN 1970 |
|
| Authors:
W. D. Brentnall; M. J. Klein; A. G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Composites of high-strength filaments in oxidation-resistant matrices are being developed for use at temperatures above 2000F. The major effort is directed to development of composites with columbium-base alloy matrices and tungsten filaments. This concept offers an alternative to conventional columbium alloy development because the matrix is required to supply only oxidation resistance and the filaments supply the strength. Various matrices were tested for oxidation and sulfidation resistance and for compatibility ... |
|
| High-Temperature Sensors for Small Gas Turbines. |
DEC 1969 |
|
| Authors:
A. Marshall Gaylord; William A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Temperature sensors for application to the turbine inlet of small gas turbine engines were developed. Two thermocouple designs to sense gas temperature were developed and tested. An optical sensor for first-stage turbine blade temperature measurement was tested in the laboratory and on a gas turbine engine. A bare multiple-junction platinum-rhodium thermocouple with a platinum-rhodium radiation shield was tested at temperatues to 2550F. Response time, calibration, drift, and life were measured ... |
|
| Compatibility Studies for Viable Titanium Matrix Composites. |
OCT 1969 |
|
| Authors:
Mark J. Klein; Mike L. Reid; Arthur G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
|
| Mechanisms of Sand and Dust Erosion in Gas Turbine Engines. |
30 SEP 1969 |
|
| Authors:
C. E. Smeltzer; M. E. Gulden; W. A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Dust erosion damage of military gas turbines is a serious problem in many current service areas. The subject program is designed to gain an improved understanding of the various mechanisms of dust erosion, as a basis for possible future development of turbine materials with improved innate erosion resistance. The experimental program is organized to evaluate the relative importance of erosion influencing variables introduced by the carrier gas, the dust suspension ... |
|
| Hot Corrosion of Coated Superalloys in a Gas Turbine Environment. |
15 SEP 1969 |
|
| Authors:
Victor S. Moore; R. K. Malik; Alvin R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Final results on Phase I Hot Corrosion Rig Testing and Analysis of 39 coating-alloy combinations are presented. Alloys included are B1900, 713C, IN-100, Rene' 41, SEL-15, U-700, WI-52 and X-40. Rig tests were performed for up to 150 hours at 1650F and 1800F on nickel-base alloys and 1800F and 2000F on cobalt-base alloys in a high-velocity environment obtained from the combustion of JP-5 fuel and air and ingestion of 35 ... |
|
| Mechanisms of Sand and Dust Erosion in Gas Turbine Engines. |
30 JUN 1969 |
|
| Authors:
C. E. Smeltzer; M. E. Gulden; W. A. Compton; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Dust erosion damage of military gas turbines is a serious problem in many current service areas. The subject program is designed to gain an improved understanding of the various mechanisms of dust erosion, as a basis for possible future development of turbine materials with improved innate erosion resistance. A materials science approach to the problem is emphasized, to observe, measure, and study erosion phenomena at the target surface. The object ... |
|
| Hot Corrosion of Coated Superalloys in a Gas Turbine Environment. |
15 APR 1969 |
|
| Authors:
V. S. Moore; W. D. Brentnall; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| A program has been initiated to assess the effectiveness of commercially available coatings for nickel- and cobalt-base superalloys in withstanding a severe hot corrosion-erosion environment. The report describes the procurement of the nine coatings and includes data from inspection tests on the thirty-eight coating alloy combinations. Also included are calibration data on blade metal temperature distribution for specimens in the turbine environmental simulators. Data are also presented on the: Initiation ... |
|
| Tungsten Reinforced Oxidation Resistant Columbium Alloys. |
28 FEB 1969 |
|
| Authors:
SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The goal of the program is to develop a structural material for use in gas turbines having a specific strength considerably greater than currently available high-strength columbium alloys and having oxidation resistance sufficient to provide 200 hours life at 2200F and significant life, under load, at temperatures up to 2500F. The operating temperatures and strength goals are beyond the range of nickel- and cobalt-base superalloys which have maximum temperature capabilities ... |
|
| Hot Corrosion of Coated Superalloys in a Gas Turbine Environment. |
27 JAN 1969 |
|
| Authors:
V. S. Moore; H. A. Cook; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| The principal activity during this report period was the procurement of the program alloys, procurement of the coatings on the airfoil specimens for hot corrosion testing, receiving inspection tests on the coated specimens, and baseline stress rupture and fatigue testing on the uncoated specimens. (Author) |
|
| Hot Corrosion of Coated Superalloys in a Gas Turbine Environment. |
01 NOV 1968 |
|
| Authors:
V. S. Moore; H. A. Cook; A. R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| A program was initiated that will assess the effectiveness of commercially available coatings for nickel- and cobalt-base superalloys in withstanding a severe hot corrosion-erosion environment. In addition, the influence of the coating on the stress rupture and fatigue properties will be measured. The recoat potential of selected coatings will be assessed after extended temperature exposure by stress rupture testing. Six nickel-base and two cobalt-base superalloys were ordered. Receiving inspection and ... |
|
| Evaluation of Superalloys for Hypersonic Vehicle Honeycomb Heat Shields |
OCT 1968 |
205 pages |
| Authors:
Raj K. Malik; Alvin R. Stetson; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Foil gage superalloys are candidate materials for use in structural and heat shield panels for reentry and hypersonic vehicles. Unlike the coated refractory metals, little attention has been given to the potential environmental effects that may contribute to changes in mechanical properties of foil gage superalloys as a result of the low-pressure and slow-cyclic exposure of a typical hypersonic flight. The objective of this program was to investigate and evaluate ... |
|
| PRODUCTION TOOL FOR DIFFUSION BONDING. VOLUME II. |
AUG 1968 |
|
| Authors:
Arthur G. Metcalfe; Fred K. Rose; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Two machines were developed to apply the hot electrode process. One is called a Yield Strength Controlled Diffusion Bonding (YSDB) machine. This machine uses hot refractory metal anvils and has been developed from a standard 100 kva spot welder. The bond cycle is typically 10 seconds and requires an argon protective atmosphere. An important feature of the machine is that feedback circuits control pressure and temperature throughout the cycle. This ... |
|
| PRODUCTION TOOL FOR DIFFUSION BONDING. VOLUME I. |
AUG 1968 |
|
| Authors:
Arthur G. Metcalfe; Fred K. Rose; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Machines were built to diffusion bond by the yield strength controlled process and by a continuous seam process. Demonstration structures were fabricated and tested in titanium alloys, refractory metals, and dispersion strengthened materials. TD Nickel combustion cans were tested at 2000F, columbium alloy panels were tested at 2500F, tantalum alloy box columns were tested at 3000F, and a tantalum nosecap was tested to destruction up to 4000F. No mechanical failures ... |
|
| Brazing Beryllium by Capillary Flow. |
JUL 1968 |
140 pages |
| Authors:
R. G. Bogowitz; A. G. Metcalfe; SOLAR TURBINES INTERNATIONAL SAN DIEGO CA
|
| Six silver-base braze alloys (including some high in copper), with a high tolerance for adverse braze conditions, were developed to give maximum capillary flow in unplated beryllium sheet without flux at 1400F to avoid loss of base metal wrought properties. In addition, one titanium-base alloy showed promise for brazing beryllium as low as 1400F. Silver-base alloys were developed and optimized, by selected additions, for brazing in argon, starting from the ... |
|
Reports by Corporate Author
