Coated hard alloy tool

Details Coated hard alloy tool Coated hard alloy tool

1995-04-24

1997-01-28

Howell, Daniel W.

Cutters, for shaping

Comprising tool of specific chemical composition

407120, 408144, 408145, B23B 2714

Patent

active

055972721

ABSTRACT:
An improved coated hard alloy tool having a substrate made of a hard alloy, and a multi-layer ceramic coating film provided on the surface of the substrate, the coating film including at least one oxide layer. The top several layers of the coating film are missing partially or completely in an area where the tool is brought into frictional contact with a workpiece. At least one oxide layer (such as Al.sub.2 O.sub.3 layer) is included in the missing layers. This increases wear resistance of the coated hard alloy tool.

REFERENCES:
patent: 4643620 (1987-02-01), Fujii et al.
patent: 4720437 (1988-01-01), Chudo et al.
patent: 4755399 (1988-07-01), Fujii et al.
patent: 4966501 (1990-10-01), Nomura et al.
patent: 4984940 (1991-01-01), Bryant et al.
patent: 5250367 (1993-10-01), Santhanam et al.
patent: 5431072 (1995-07-01), Christoffel

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