Surface coated cutting tool

Details Surface coated cutting tool Surface coated cutting tool

1994-06-21

1996-08-13

Turner, Archene

Stock material or miscellaneous articles

Composite

Of inorganic material

428698, 428702, 51307, 51309, G32B 1504

Patent

active

055454909

ABSTRACT:
A cutting tool whose surface is coated with a composite hard layer formed by chemical vapor deposition and having excellent wear resistance and chipping resistance. The cutting tool contains a substrate whose surface is coated with a composite hard layer containing an inner layer including one or more layers of titanium carbide, titanium nitride, titanium carbonitride, titanium carboxide, and titanium oxicarbonitride, and an outer layer including at least one alumina layer. The alumina layer contains K-type alumina such that an X-ray intensity ratio I.sub.A /I.sub.B of two specific crystal faces A and B in X-ray diffraction is not smaller than 2, where the A-face and B-face denote faces of K-type alumina defined as those whose interfacial distances are 2.79.ANG. and 2.57.ANG. in ASTM4-0878, and I.sub.A and I.sub.B denote X-ray intensity of the faces A and B in X-ray diffraction.

REFERENCES:
patent: 4180400 (1979-12-01), Smith et al.
patent: 4463062 (1984-07-01), Hale
patent: 4629661 (1986-12-01), Hillert et al.
patent: 4749630 (1988-06-01), Konig et al.
patent: 4984940 (1991-01-01), Bryant et al.
Vuorinen et al "Characterization of .alpha.Al.sub.2 O.sub.3, and .alpha.-.kappa. Al.sub.2 O.sub.3 Multioxide Coatings on Cemented Carbides" Thin Solid Films, 193/194 (1990) pp. 536-546.
Chatfield "Characterization of the Interfaces in Chemical Vapour Deposited Coatings on Cemented Carbides" RM & HM Sep. 1990 pp. 132-138.

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