Coated body with nanocrystalline CVD coating for enhanced edge toughness and reduced friction
AssigneeSeco Tools AB
InventorsSakari Ruppi, Lennart Karlsson
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Abstract
An improved coated body having a nanocrystalline CVD coating of Ti(C,N,O) is disclosed. The coating is formed using the MTCVD process and including, as part of the gaseous mixture, CO, CO2 or mixtures thereof. The use of this dopant during the coating results in a much smaller, equiaxed grain size. The method of forming the body is also disclosed.
Claims21
A coated body having as a coating layer, a layer of Ti(C,N,O) having a grain size of 25 nm or less, wherein the Ti(C,N,O) has a ratio of O/Ti of from 0.10 to 0.40, a ratio of C/Ti of from 0.40 to 0.60 and a ratio of N/Ti of from 0.15 to 0.35.
The coated body of claim wherein the x-ray diffraction half-peak breadth for the coating layer is from 2.25 to 2.50 of that of a layer of Ti(C,N).
Dependencies are inferred from the claim text.