Molybdenum disilicide reinforced aluminum nitride matrix composite
- Intertec Southwest LLC, Tucson, AZ (United States)
Aluminum nitride (AlN) based ceramics have low density, high thermal conductivity, and good strength at both ambient and elevated temperatures but are brittle and susceptible to oxidation at high temperatures. The addition of silicon based ceramics to an AlN matrix is known to increase its oxidation resistance as well as high temperature properties. This work investigated the processing of molybdenum disilicide (MoSi{sub 2}) reinforced AlN matrix composites. Two processing routes were investigated, i.e. one using conventional tape casting followed by pressureless sintering, and the other using a low temperature 850{degrees}C direct metal oxidation approach. Preliminary data suggests that the addition of molybdenum disilicide inhibits the densification of aluminum nitride in the conventional tape casting and pressureless sintering approach. On the other hand, the direct metal oxidation approach resulted in MoSi{sub 2}/AlN composites with good mechanical properties and oxidation resistance up to 1600{degrees}C. It was also found that the composite generated by the direct metal oxidation method continued to densify upon heat treatment at higher temperatures. Thus, a high density MoSi{sub 2}/AlN composite can be produced by a cost effective direct metal oxidation/pressureless sintering method. The preliminary mechanical properties and potential applications of MoSi{sub 2} reinforced AlN matrix composite are presented.
- OSTI ID:
- 530695
- Report Number(s):
- CONF-9604124-; TRN: 97:003389-0031
- Resource Relation:
- Conference: 98. annual meeting of the American Ceramic Society, Indianapolis, IN (United States), 14-17 Apr 1996; Other Information: PBD: 1996; Related Information: Is Part Of Ceramic transactions: Advances in ceramic-matrix composites III. Volume 74; Bansal, N.P.; Singh, J.P. [eds.]; PB: 667 p.
- Country of Publication:
- United States
- Language:
- English
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