Coated silicon nitride cutting tool and process for making

Details Coated silicon nitride cutting tool and process for making Coated silicon nitride cutting tool and process for making

C - Chemistry, Metallurgy

04

B

57/15

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

Patent

CA 1245463

D-84-6-008 ABSTRACT A coated ceramic silicon nitride cutting tool comprises a substrate having a major portion by volume silicon nitride, a coating of refractory material thereon, and an interfacial layer intermediate between the substrate and the layer of refractory material. The interfacial layer comprises a refractory metal chemically reacted to form a reaction bonded refractory metal nitride for enhancing the adherence of the layer of refractory metal material to the substrate. The interfacial layer is provided by reacting a refractory metal halide with the surface to form a reaction bonded refractory metal nitride. -23-

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