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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Nickel base alloy with high strength, ductility, good impact and oxidation resistance, microstructural stability, workability potential, and the ability to show improved strength and ductility when directly solidified has recently been developed for high temperature applications.
Ultrasonic vibration effect on precipitation hardening of steels and super alloys
Oxidation resistance and ductility of cobalt heat resistant alloys optimized by restriction of silicon and manganese content
Edge notch sensitivity in thin sheet nickel alloys under stress at high temperatures
Corrosion tests of coatings for cobalt and nickel base alloys
Three oxidation-resistant alloy foil claddings for protecting typical gas turbine engine alloys of nickel and cobalt
New glasses are used as protective coatings on metals and alloys susceptible to oxidation at high temperatures in oxidizing atmospheres. Glasses are stable and solid at temperatures up to 1000 deg C, adhere well to metal surfaces, and are usable for metals with broad range of expansion coefficients.
Argon atomized nickel alloys processed thermochemically for use at high temperatures
High temperature X ray diffractometer study of oxidation of heat resistant alloys
Estimation of gamma phase composition in nickel base heat resistant alloys based on analysis of quaternary phase diagrams
Evaluation of nickel base alloy compositions to determine base for development of wrought high temperature alloy with improved strength characteristics
Heat resistant alloy technology for space shuttle reentry shields
Freon-12 applied to tool cutting edge evaporates quickly, leaves no residue, and permits higher cutting rate than with conventional coolants. This technique increases cutting rate on Rene-41 threefold and improves finish of machined surface.
Evaluation of protective coatings for heat resistant alloys
Production of oxidation resistant aluminized iron and nickel slurry coatings for heat resistant alloys
Electron beam vapor deposited CoCrAlY coating composition optimization with ballistic impact and furnace/long term burner rig oxidation tests
Superior oxidation protection for nickel-base alloys at temperatures up to 1367 K was obtained with cobalt-base alloy coating. Coating had 25 Cr, 14 Al, and 0.5 Y weight percent composition. Coating was applied by electron beam vapor deposition to thickness of 76 to 127 microns.
The final results of an oxidation-reduction rig evaluation of aluminide coatings are presented, as applied to 1N-100 and B1900 nickel-base and X-10 and WI-52 cobalt-base alloys. Burner rigs were used which operated on JP-5 fuel and air, producing a gas velocity of 0.85 (2000 to 2500 ft/sec) at the specimen's leading edge. One-hour heating cycles were used with three minutes of air blast cooling. Results of testing at temperatures ranging from T sub max of 1850 to 2050 F indicate that coated B1900 has the longest oxidation life at all temperatures, followed by IN-100X-40WI-52, based on a weight change criterion. Coatings on nickel-base alloys provided more than twice the life of coating on cobalt-base alloys at comparable temperatures. The coatings with higher aluminum content and comparable thickness had longer lives. Silicon appeared to be a beneficial additive in the nickel-base alloy coatings for long term, low temperature life, but not for short term, high temperature performance. Chromium was identified in all coatings. Extrapolating the life results obtained to 1600 F, all the selected coatings on the four alloys would be protective for at least 10,000 hours.