Patent ID: 8039108

Claim:
A member resistant to erosion by cavitation in which the member contacts with fluid, comprising: a base material, wherein a surface of the base material is hardened; an intermediate film including at least one element selected from the group of Cr, Ti, W, Ni, Si, and Al, provided on a surface of the base material; a gradient film provided on a surface of the intermediate film; a first amorphous carbon film coating that comprises a plurality of columnar structures on a surface of the gradient film; and a second amorphous carbon film coating that comprises a plurality of granular structures deposited onto a surface of the first amorphous carbon film coating without orientation, wherein in the gradient film, the at least one element of the intermediate film is added to an amorphous carbon material so that a composition of the gradient film changes toward a composition of the at least one element constituting the intermediate film in a direction from the first amorphous carbon film coating to the intermediate film.