RAMJET TECHNOLOGY PROGRAM, 1963. VOLUME 10. SECTION 18. HIGH TEMPERATURE COATED TUNGSTEN STRUCTURES
Final summary technical rept., 25 Jan 1963-31 Jan 1964
MARQUARDT CO VAN NUYS CA
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The goal of the high temperature coated tungsten structures program was to develop methods of protecting tungsten substrates, in oxidizing environments, to temperatures in excess of 3460R. Material systems of binary, ternary, and quaternary alloys were synthesized in an arc-melting furnace and then screened for oxidation resistance using an oxyacetylene torch. This resulted in the development of a binary hafnium-tantalum alloy that withstood temperatures well above 3460R, under oxidizing conditions. The oxide grown from the base alloy was well-bonded, thermal shock resistant, and dense. A feasibility study on the coating of the test specimens was accomplished by plasma-arc spraying and slurry coating the alloy powders onto tungsten and 90 percent tantalum-10 percent tungsten substrates of various configuration. This work demonstrated the feasibility of utilizing this very promising material system as a coating for oxidation protective refractory metals.
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