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US 6,673,393 B2Granted
Oxide coated cutting tool
AssigneeSandvik AB
InventorBjörn Ljungberg
Life of this patent
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Abstract
A body is at least partially coated with one or more refractory layers of which at least one layer is of a finegrained κ-Al2O3. Said κ-Al2O3 layer has equiaxed grains with an average grain size of <0.5 μm. The Al2O3 layer also has at least one sublayer containing Al, Si and O. The finegrained κ-Al2O3 microstructure is obtained by periodically introducing a silicon halide, preferably SiCl4, during the Al2O3-process.
Claims5
A method of coating a body with at least one finegrained κ-Al2O3 layer, the method comprising:
- contacting the body with a reaction mixture comprising a hydrogen carrier gas, one or more halides of aluminium and a hydrolysing and/or oxidising agent at 800-1050 C;
- adding a sulphur agent to the reaction mixture to enhance the growth rate;
- and
- depositing a κ-Al2O3 layer comprising at least one silicon enriched sublayer by periodically introducing a silicon halide.
1 more element
Dependencies are inferred from the claim text.