HIGH-VELOCITY-OXIDATION PERFORMANCE OF METAL-CHROMIUM-ALUMINUM (MCrAl), CERMET, AND MODIFIED ALUMINIDE COATINGS ON IN-100 AND TYPE VIA ALLOYS AT 1093° C

摘要

MCrAl, cermet, and modified aluminide types of coatings applied to EN-100 and NASA-TRW-VIA alloy specimens were cyclically oxidation tested in a high velocity (Mach 1) gas flame at 1093℃. Several coating compositions of each type were evaluated for oxidation resistance. The modified aluminide coating, Pt-Al, applied to alloy VIA proved to be the best, providing oxidation protec¬tion to approximately 750 hours based on weight change measurements. The second best, a CoCrAlY coating applied to VIA, provided protection to 450 hours. The third best was a cermet + aluminide coating on VIA with a protection time to 385 hours.