Coated silicon nitride cutting tools

Details Coated silicon nitride cutting tools Coated silicon nitride cutting tools

C - Chemistry, Metallurgy

04

B

57/2, 117/240

C04B 41/85 (2006.01) B23B 27/14 (2006.01) C04B 35/584 (2006.01) C04B 41/50 (2006.01) C04B 41/87 (2006.01)

Patent

CA 1211323

COATED SILICON NITRIDE CUTTING TOOLS Abstract: Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, adherent coating layer of a refractory material. The silicon nitride substrate body consists 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 silicon dioxide, aluminum oxide, magnesium oxide, yttrium oxide, hafnium oxide, zirconium oxide, the lanthanide rare earth oxides, and mixtures thereof.

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