CVD of Al.sub.2 O.sub.3 layers on cutting inserts

Details CVD of Al.sub.2 O.sub.3 layers on cutting inserts CVD of Al.sub.2 O.sub.3 layers on cutting inserts

1993-09-30

1996-08-06

King, Roy V.

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

4272552, 4272551, 4272481, 4271263, 51307, 51309, 428698, 428701, 428702, 428697, C23C 1600, B32B 900

Patent

active

055431763

ABSTRACT:
The present invention relates to a method for coating a cutting insert having at least one layer of a carbide, carbonitride, oxynitride, oxycarbide, oxycarbonitride or nitride of one metal selected form the groups IVB, VB or VIB of the Periodic Table, the method comprising subjecting the insert to chemical vapor deposition and coating the insert with an epitaxial kappa-Al.sub.2 O.sub.3 layer by the hydrolysis reaction of AlCl.sub.3, H.sub.2 and CO.sub.2, the hydrolysis reaction being carried out while maintaining the content of water vapor in the gas phase during nucleation of Al.sub.2 O.sub.3 at less than 5 ppm.

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