Coated cutting insert

Details Coated cutting insert Coated cutting insert

1990-06-15

1991-12-10

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

428332, 428408, 428697, 428698, 428701, 428702, B32B 900

Patent

active

050716964

ABSTRACT:
The present invention relates to a body coated with at least one double layer Al.sub.2 O.sub.3 -TiC. Because the Al.sub.2 O.sub.3 -layer in contact with the TiC-layer consists of kappa-Al.sub.2 O.sub.3 or theta-Al.sub.2 O.sub.3 an improved adherence has been obtained.
A further improvement of the properties is obtained if the body after the coating is heat treated for 0.3-10 hours at 900.degree.-1100.degree. C. in protecting gas atmosphere at which initially nucleated kappa- or theta-Al.sub.2 O.sub.3 is transformed to fine grained alpha-Al.sub.2 O.sub.3.

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patent: 4239536 (1980-12-01), Yamamoto et al.
patent: 4357382 (1982-11-01), Lambert et al.
patent: 4474849 (1984-10-01), Fujimori et al.
patent: 4619866 (1986-10-01), Smith et al.
patent: 4714660 (1987-12-01), Gates, Jr.

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