CRN coating film and sliding member
The present invention addresses the problem of providing a CrN coating film which has excellent peeling resistance such that peeling thereof starting at a crack is unlikely to occur even in a more severe lubrication environment. The problem is solved by a CrN coating film which has a preferred orientation of 200 as determined by XRD, and in which the X-ray diffraction intensity ratio of the (200) plane with respect to the (111) plane, (200)/(111), is 5.5 or higher, and the ratio of crystal grains of 1 μm or smaller is 85% or higher in a crystal grain size distribution measured by an EBSD analysis.
1. A CrN coating film, having a preferred orientation of 200 as determined by XRD,
wherein
an X-ray diffraction intensity ratio of a (200) plane with respect to a (111) plane, (200)/(111), is 5.5 or higher, and
a ratio of crystal grains of 1 μm or smaller is 85% or higher in a crystal grain size distribution measured by an EBSD analysis.
2. The CrN coating film according to claim 1 , having a micro-Vickers hardness of 800 HV to 1,300 HV.
3. The CrN coating film according to claim 1 , having a plastic work rate of 61% to 69% as measured using a Vickers indenter in accordance with ISO14577-1.
4. A sliding member, comprising a sliding surface coated with the CrN coating film according to claim 1 .
5. A sliding member, comprising a sliding surface coated with the CrN coating film according to claim 2 .
6. A sliding member, comprising a sliding surface coated with the CrN coating film according to claim 3 .