Cutting tool composed of silicon nitride

Details Cutting tool composed of silicon nitride Cutting tool composed of silicon nitride

1996-05-30

1997-09-16

Group, Karl

Compositions: ceramic

Ceramic compositions

Refractory

407119, C04B 35587

Patent

active

056680694

ABSTRACT:
A cutting tool composed of silicon nitride comprising chiefly a .beta.-silicon nitride crystal phase and containing a grain boundary phase of rare earth elements, silicon, aluminum, oxygen and nitrogen, wherein the cutting surface is constituted by at least a fired surface or a surface formed by removing and polishing the fired surface by an amount of not larger than 10 .mu.m, and has in the mirror surface thereof a micro-Vicker's hardness which is higher than that of the interior thereof and is not smaller than 16 GPa. The cutting tool has a cutting surface that can be easily worked enabling the cost of working to be decreased, and has a highly hard layer that is suited for cutting cast iron and the like materials featuring increased durability and extended cutting life.

REFERENCES:
patent: 4881950 (1989-11-01), Bhat et al.
patent: 5296008 (1994-03-01), Moriguchi et al.
patent: 5308561 (1994-05-01), Leimer et al.
patent: 5316586 (1994-05-01), Suzuki et al.
patent: 5432132 (1995-07-01), Dasgupta et al.
patent: 5525134 (1996-06-01), Mehrotra et al.

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