Silicon nitride member, method for manufacturing the same,...

Details Silicon nitride member, method for manufacturing the same,... Silicon nitride member, method for manufacturing the same,...

2005-03-08

2005-03-08

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S697000, C428S298700, C428S699000, C428S701000, C427S419100, C427S419200, C427S419700, C501S097100

Reexamination Certificate

active

06863963

ABSTRACT:
A silicon nitride member, a method for manufacturing the silicon nitride member and a cutting tool are disclosed. A cutting tool1includes a substrate3formed through sintering of a silicon nitride material, and a hard film5composed of a plurality of hard-component layers. The cutting tool1is characterized in that: when the amount of a grain boundary phase as measured at a central portion (for example, the barycenter) of the substrate3is taken as 100% by volume, the amount of the grain boundary phase at a depth of 300 μm from the surface of the substrate3is 50% to 70% by volume; when the strength of the substrate3as measured before coating with the hard film5is taken as 100%, the hardness as measured after coating with the hard film5is 70% to 95%; and a change in weight of the substrate3associated with sintering is 1.5% to 3.5% by weight.

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