Development of oxidation-resistant molybdenum and tungsten alloys
There are currently no alloys of the refractory metals molybdenum and tungsten, with or without protective coatings, that can withstand high-temperature oxidizing conditions. Thus, even though these alloys possess high-temperature strength, they cannot be utilized in an oxygen-containing atmosphere because their oxidation resistance is nil. A number of new alloys were prepared and their oxidation kinetics were studied at temperatures above 1000/sup 0/C in pure oxygen and air. The alloys developed fell into the following categories: (1) Mo-Cr-Al-Y, (2) W-Cr-Al-Y, (3) Mo-W-Cr-Al, (4) Mo-Cr-Si, (5) W-Cr-Si, (6) Mo-W-Cr-Si, (7) Mo-Cr-Pd, (8) W-Cr-Pd, (9) W-Cr-Pd-(dispersed particles of SiO/sub 2/, ThO/sub 2/, and Y/sub 2/O/sub 3/), and (10) Mo-W-Cr-Pd. These alloys showed definite improvements in oxidation resistance over the commercially available Mo and W alloys. Particularly interesting alloys in this group are those with Pd. With addition of a minor amount of Pd, typically from 0.5% to 1%, a remarkable increase in oxidation resistance was achieved. These alloys also exhibited excellent cyclic oxidation resistance, which is important in practical applications. Generally, additions of large amounts of W into Mo alloys increased in the oxidation resistance dramatically.
- Research Organization:
- Pennsylvania State Univ., University Park (USA)
- OSTI ID:
- 7203621
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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