Silicon nitride based composite with improved fracture toughness

Details Silicon nitride based composite with improved fracture toughness Silicon nitride based composite with improved fracture toughness

1990-10-11

1993-10-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 97, 501 98, 409131, 407119, 82 111, C04B 3556

Patent

active

052504778

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 silicon nitride matrix. A first phase comprises silicon nitride grains and the second phase is an intergranular phase formed from one or more suitable densification aids. 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.sup.1/2.

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