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US 8,507,082 B2Granted
CVD coated polycrystalline c-BN cutting tools
AssigneeKennametal Inc.
InventorsZhigang Ban, Yixiong Liu
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Abstract
In one aspect, the present invention provides coated cutting tools comprising a PcBN substrate wherein a layer of single phase α-alumina is deposited by chemical vapor deposition directly on one or more surfaces of the substrate.
Claims20
A coated cutting tool comprising:
- a substrate comprising greater than 80% weight percent polycrystalline cubic boron nitride (PcBN);
- and
- a coating adhered to the substrate, the coating comprising a layer of single phase α-Al2O3 deposited by chemical vapor deposition directly on a surface of the substrate, wherein the coating has a critical load (Lc) of greater than 65 N.
A coated cutting tool comprising:
- a substrate comprising greater than 80% weight percent polycrystalline cubic boron nitride (PcBN);
- and
- a coating adhered to the substrate, the coating comprising a layer of single phase α-Al2O3 deposited by chemical vapor deposition directly on a surface of the substrate, wherein grains at the surface of the single phase α-Al2O3 have an aspect ratio of at least 5 in a plane parallel to the surface.
Dependencies are inferred from the claim text.