Surface-coated cermet cutting tool with hard coating layer...

Details Surface-coated cermet cutting tool with hard coating layer... Surface-coated cermet cutting tool with hard coating layer...

2006-01-06

2008-10-28

Turner, Archene (Department: 1794)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C051S307000, C051S309000, C428S336000, C428S697000, C428S698000, C428S699000, C428S701000, C428S702000

Reexamination Certificate

active

07442433

ABSTRACT:
A surface-coated cermet cutting tool is formed by depositing on a surface of a tool substrate a hard-coating layer composed of the following layers (a) and (b):(a) the lower layer is composed of one or more layers of TiC, TiN, TiCN, TiCO, and TiCNO and has a total average layer thickness in the range of 3 to 20 μm, and (b) the upper layer is an aluminum oxide layer having an α-type crystal structure when chemically deposited and has an average layer thickness in the range of 1 to 15 μm. In the case of the upper layer, the reformed α-Al2O3layer shows distribution graphs of covalent lattice points of constituent atoms, which shows distribution ratios of individual ΣN+1 to total ΣN+1, having the highest peak at Σ3 and showing the distribution ratios of Σ3 to total ΣN+1 in the range of 60 to 80%.

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