Cutting insert with a titanium oxycarbonitride coating and method for making the same
AssigneeKennametal Inc.
InventorsAlfred S. Gates, Jr., Zhigang Ban
Life of this patent
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Abstract
A method for making a coated cutting insert, as well as the coated cutting insert, includes a step of providing a substrate which has a surface, and depositing a CVD coating layer of titanium oxycarbonitride. The gaseous mixture from which the coating layer of titanium oxycarbonitride is deposited has a composition of nitrogen, methane hydrogen chloride, titanium tetrachloride, acetonitrile, carbon monoxide, and hydrogen. The coating layer of titanium oxycarbonitride comprises titanium oxycarbonitride whiskers having as measured in a two-dimensional plane view an average length greater than about 1.0 μm, an average width greater than about 0.2 μm, and an average aspect ratio greater than about 2.0.
Claims15
A coated cutting insert comprising:
- a substrate having a surface;
- a coating scheme on the surface of the substrate;
- the coating scheme including a coating layer of titanium oxycarbonitride wherein the titanium oxycarbonitride comprising titanium oxycarbonitride whiskers having as measured in a two-dimensional plane view an average length greater than about 1.0 μm, an average width greater than about 0.2 μm, and an average aspect ratio greater than about 2.0.
A coated cutting insert produced by the process comprising the steps of:
- providing a substrate with a surface;
- depositing by chemical vapor deposition a coating layer of titanium oxycarbonitride from a gaseous mixture comprising:
- nitrogen present in an amount between about 5 mol percent and about 40 mol percent,
- methane present in an amount between about 0.5 mol percent and about 8.0 mol percent,
- hydrogen chloride optionally present in an amount up to about 5.0 mol percent,
- titanium tetrachloride present in an amount between about 0.2 mol percent and about 3.0 mol percent,
- acetonitrile present in an amount between about 0.02 mol percent and about 0.15 mol percent,
- carbon monoxide present in an amount between about 0.4 mol percent and about 2.0 mol percent, and
- hydrogen present in an amount between about 41.85 mol percent and about 93.88 mol percent.
Dependencies are inferred from the claim text.