Silicon nitride ceramic and cutting tool made thereof

Details Silicon nitride ceramic and cutting tool made thereof Silicon nitride ceramic and cutting tool made thereof

1995-01-12

1996-06-11

Group, Karl

Abrasive tool making process, material, or composition

With inorganic material

501 97, 501 98, C04B 35587, B24D 1700

Patent

active

055251340

ABSTRACT:
Provided is a silicon nitride based ceramic which is particularly useful for use as a cutting tool in the high speed chip forming machining of metallic materials. The ceramic is preferably composed of at least 85 volume percent (v/o) beta silicon nitride phase and less than about 5 v/o intergranular phase. The ceramic has greater than 0.2 weight percent (w/o) magnesia, greater than 0.2 w/o yttria, where the sum of magnesia and yttria is less than 5 w/o. The ceramic preferably has less than 0.2 v/o porosity.

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