Ceramic based composites with improved fracture toughness

Details Ceramic based composites with improved fracture toughness Ceramic based composites with improved fracture toughness

C - Chemistry, Metallurgy

04

B

261/1, 25/133

C04B 35/58 (2006.01) C04B 35/80 (2006.01)

Patent

CA 1285582

CERAMIC BASED COMPOSITES WITH IMPROVED FRACTURE TOUGHNESS ABSTRACT 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 in- vention, 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. Option- ally, 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?m1/2. Methods for preparation and use are also described.

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