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Ceramic based composites with improved fracture toughness
Ceramic based composites with improved fracture toughness
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机译:具有改善的断裂韧性的陶瓷基复合材料
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摘要
Composite materials, articles and cutting tools are prepared by densification to form a body comprising whiskers of hard refractory transition metal carbides, nitrides or carbonitrides uniformly distributed in a two-phase ceramic matrix. In one aspect of the invention, a first phase comprises silicon nitride grains and the second phase is an intergranular phase formed from one or more suitable densification aids. In another aspect, a first phase comprises silicon aluminum oxynitride grains and the second phase is formed from one or more suitable densification aids and alumina. Optionally, dispersoid particles and/or polycrystalline fibers may also be incorporated. The preferred composite article or cutting tool has a fracture toughness equal to or greater than about 3.5 MPa·m ½. Methods for preparation and use are also described.
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