Abrasive wear behavior of a Si{sub 3}N{sub 4}-MoSi{sub 2} composite
- Bureau of Mines, Albany, OR (United States)
- Los Alamos National Lab., NM (United States). Ceramic Science and Technology Group
MoSi{sub 2} particles (20 vol%) have been added to Si{sub 3}N{sub 4} to form ceramic matrix-intermetallic composites. Benefits associated with the addition of the MoSi{sub 2} to Si{sub 3}N{sub 4} include higher strength, higher fracture toughness, no loss in oxidation resistance, and lower electrical resistivity. However, because the hardness of MoSi{sub 2} is approximately half that of Si{sub 3}N{sub 4}, a decrease in the specific wear rate of the Si{sub 3}N{sub 4}-20 vol% MoSi{sub 2} composite is expected to result from the incorporation of the MoSi{sub 2} into the Si{sub 3}N{sub 4}. In this Bureau of Mines and Los Alamos National Lab. study, it is found, however, that the specific wear rate of the composite during two-body abrasion by SiC particles is equivalent in magnitude to the specific wear rate of monolithic Si{sub 3}N{sub 4}. The specific wear rates of both the Si{sub 3}N{sub 4}-20 vol% MoSi{sub 2} composites and monolithic Si{sub 3}N{sub 4} are four to five times less than that of monolithic MoSi{sub 2}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 253568
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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