Method of coating a body with an .alpha.-alumina coating

Details Method of coating a body with an .alpha.-alumina coating Method of coating a body with an .alpha.-alumina coating

1995-09-22

1997-08-05

Beck, Shrive

Coating processes

Coating by vapor, gas, or smoke

Mixture of vapors or gases utilized

4272557, C23C 1640

Patent

active

056540353

ABSTRACT:
A method of coating a body coated with refractory single- or multi-layers, wherein specific layers are characterized by a controlled microstructure and phase composition with crystal planes preferably grown in a preferential direction with respect to the surface of the coated body. The coating comprises one or several refractory layers of which at least one layer is a dense, fine-grained layer of .alpha.-Al.sub.2 O.sub.3 preferably textured in the (012) direction. The coated tool according to the present invention exhibits excellent surface finish and shows much improved wear and toughness properties compared to prior art objects when used for machining steel, cast iron and, particularly, when machining nodular cast iron.

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