Coated composite silicon nitride cutting tools

Details Coated composite silicon nitride cutting tools Coated composite silicon nitride cutting tools

C - Chemistry, Metallurgy

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B

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C04B 35/00 (2006.01) B23B 27/14 (2006.01) C04B 35/584 (2006.01) C04B 41/50 (2006.01) C04B 41/87 (2006.01)

Patent

CA 1204638

24483 COATED COMPOSITE SILICON NITRIDE CUTTING TOOLS Abstract: Cutting tools and cutting tool inserts having im- proved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a composite silicon nitride substrate having at least one hard adherent coating layer of a refractory material. The composite silicon nitride substrate body consists essentially of particles of a refractory material uniformly distributed in a matrix consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of yttrium oxide, hafnium oxide, the lanthanide rare earth oxides, and mixtures thereof.

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