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HIGH TEMPERATURE OXIDATION PROTECTIVE COATINGS FOR VANADIUM-BASE ALLOYS.
IIT RESEARCH INST CHICAGO ILL
Basic pack-siliconizing parameters-time, temperature, activator concentration and lo cation-and edge and surface preparation tech niques have been optimized for thin 0.020 to 0.030 inch sheet with respect to static and dynamic oxidation life, coating thickness, and coating adherence during elastic and plastic deformation. Processing for 8 hours at 2150 F with either an isolated or mixed activator silicon pack yields coatings of optimum thick ness, i. e., 2.25 to 3 mils. Static oxidation life of V-60 wo Cb-1 wo Ti coated under these conditions is greater than 500 hours at 2200 F. Sixteen other vanadium-columbium base alloys containing various refractory metal additions were pack-siliconized and oxidation tested. Author
Final rept., 13 Sep 62-12 Aug 63.
N600 19 59182