INVESTIGATION OF THE OXIDATION RESISTANCE OF ZIRCONIUM BORIDE-MOLYBDENUM DISILICIDE ALLOYS
ATD work assignment no. 88
LIBRARY OF CONGRESS WASHINGTON DC AEROSPACE TECHNOLOGY DIV
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This work examines the oxidation resistance of pure zirconium boride and zirconium boride-molybdenum disilicide alloys. It was found that the oxidation resistance of the zirconium boride-molybdenum disilicide alloys considerably exceeds that of pure zirconium boride, which, like all the other borides of transition metals, begins to oxidize in an oxygen or air medium at temperatures of only 700-800C. The article describes the process by which they oxidize the specimens. The zirconium boride specimens do not disintegrate, however, because it was found that they are covered with a protective film. Protective films are also formed in the oxidation process of the zirconium boride-molybdenum disilicide alloys, this process differing from that of pure zirconium boride. The films are analyzed and their effect is discussed. The authors explain the reason for the higher protective properties of the films formed on the alloys as compared to those formed on pure zirconium boride and they conclude that the zirconium boride-molybdenum disilicide alloys possess an exceptionally high oxidation resistance and can be used at temperatures up to 1500-1550C.
- Properties of Metals and Alloys
- Fabrication Metallurgy