Coated silicon nitride cutting tools

Details Coated silicon nitride cutting tools Coated silicon nitride cutting tools

C - Chemistry, Metallurgy

04

B

117/240

C04B 35/58 (2006.01) B23B 27/14 (2006.01) C04B 35/584 (2006.01) C04B 41/52 (2006.01) C04B 41/89 (2006.01)

Patent

CA 1226772

COATED SILICON NITRIDE CUTTING TOOLS Abstract of the Disclosure Coated cutting tools and coated cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temper- ature, or workpiece hardness comprise a silicon nitride substrate body having at least one hard, intermediate adherent coating layer of a refractory material and an outer adherent coating layer. The intermediate adherent coating layer has a different chemical composition than the outer adherent coating layer. 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.

462774

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