Member covered with hard coating

摘要

A member covered with a hard coating according to the present invention has a hard coating which has excellent erosion resistance, a hardness (H) of 20 GPa or more as measured using a nano indenter and a ratio of the hardness (H) to a Young's modulus (E) (i.e., H/E) of 0.06 or more, and comprises Ti and/or Cr, Al and N, wherein the total amount of Ti and Cr relative to the total amount of elements other than non-metal elements in the coating is 0.1 to 0.6 inclusive in terms of atomic ratio and the amount of Al relative to the total amount of the elements other than the non-metal elements in the coating is 0.4 to 0.7 inclusive in terms of atomic ratio.

主权项

1. A member covered with a hard coating, comprising:
a substrate for any one selected from the group consisting of a steam turbine blade, a jet engine compressor blade, a compressor screw for gas or liquid compression, a turbo compressor impeller, and a fuel injection valve and a hard coating covering the substrate, wherein the hard coating has a hardness (H) of 20 GPa or more and a harness to Young's modulus ratio (H/E) of 0.06 or more, where the hardness and the Young's modulus are measured with a nano indenter, and the hard coating has a composition of (TiaCrbAlcSidBeYf)(CxNy), where a, b, c, d, e, f, x, and y represent atomic ratios and
0≦a≦0.6,0≦b≦0.6,0.4≦c≦0.7,0≦d≦0.15,0≦e≦0.1,0≦f≦0.05,0.1≦a+b≦0.6,a+b+c+d+e+f=1,0