Cutting tool

Details Cutting tool Cutting tool

2005-09-06

2005-09-06

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

C407S119000, C051S307000, C051S309000, C428S325000, C428S697000, C428S698000, C428S699000

Reexamination Certificate

active

06939607

ABSTRACT:
A ceramic cutting tool including a ceramic base member4of a tool main body1which is formed of a composite ceramic which contains a hard phase dispersed within an alumina matrix phase. The hard phase contains, as a predominant component, one or more elements selected from hard-phase-forming metal elements M in the form of at least one of a carbide, nitride, or boride, or in the form of a solid solution of at least two selected from the carbide, nitride and boride. The hard-phase-forming metal elements M include Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and Si. The surface of the ceramic base member4is covered with a coating layer1f, which contains titanium carbonitride or titanium nitride as a predominant component. The coating layer1fhas an average crystal-grain size of 0.1 to 0.5 μm as observed on the surface, and an average thickness of 0.5 to 2 μm. The coating layer4fis formed by a CVD at a low to medium temperature range of 750 to 900° C. The ceramic cutting tool can be fabricated at low cost and can secure stable cutting performance over a long period even when the tool is used under severe cutting conditions under which large thermal and mechanical loads act on the tool.

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European Search Report for EP 01 12 0751 dated Jan. 14, 2002.

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