Si.sub.3n.sub.4 composite cutting tool material and method...

Details Si.sub.3n.sub.4 composite cutting tool material and method... Si.sub.3n.sub.4 composite cutting tool material and method...

C - Chemistry, Metallurgy

04

B

261/1, 25/133, 2

C04B 35/58 (2006.01) B22F 7/06 (2006.01) C04B 35/78 (2006.01)

Patent

CA 1127189

ABSTRACT OF THE DISCLOSURE A cutting tool for cutting of cast iron is formed by blending a nitride powder and an oxide powder, and heating and shaping the mixture under controlled conditions. The nitride powder consists of substantially alpha phase silicon nitride having a cation impurity content no greater than 1% and the oxide powder is at least one of yttria, magnesium oxide and zirconium oxide and is devoid of spinel. The cutting tool exhibits a failure mode by wear and not by fracture or thermal cracking when used to cut cast iron.

326050

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