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US 8,496,718 B2Granted
Silicon nitride cutting tool
AssigneeKYOCERA Corporation
InventorsTakashi Watanabe, Tatsuyuki Nakaoka, Takero Fukudome, Shuichi Tateno, Hiroshi Yoshimitsu
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Abstract
A silicon nitride cutting tool comprising a sintered product is disclosed. The sintered product comprises silicon nitride, at least one rare earth element compound, and a magnesium compound. The silicon nitride cutting tool further comprises a surface region and an inside region comprising the sintered product with varying content ratios of component compounds to provide enhanced wear and fracture resistance.
Claims11
A silicon nitride cutting tool comprising:
- a sintered product comprising silicon nitride, a rare earth compound containing at least one rare earth element, and a compound comprising magnesium;
- a surface region of the sintered product;
- and
- an inside region of the sintered product;
- wherein the ratio of the content of the at least one rare earth element in the surface region to the content of the at least one rare earth element in the inside region is at least about 95%, and the ratio of the content of the magnesium in the surface region to the content of the magnesium in the inside region is less than about 95%;
- and
- wherein the sintered product further comprises oxygen, wherein the ratio of the content of the oxygen in the surface region to the content of the oxygen in the inside region is at least about 85%.
4 more elements
Dependencies are inferred from the claim text.