Patent ID: 8449715

Claim:
An internal member of a plasma processing vessel, comprising: a base material, wherein the base material comprises at least one of stainless steel, Al, Al alloy, W, W alloy, Ti, Ti alloy, Mo, Mo alloy, carbon, oxide or non-oxide based sintered ceramic body, and carbonaceous material; and a film formed by thermal spraying of ceramic on a surface of the base material, wherein the film is formed of ceramic including at least one kind of element selected from the group consisting of B, Mg, Al, Si, Ca, Cr, Y, Zr, Ta, Ce and Nd, and at least a portion of the film is sealed by a sol-gel method to form a sealing-treated portion, wherein the sealing-treated portion is formed in a lower portion of the film to make a contact with the base material by using Y203, and wherein the sealing-treated portion is not formed in an upper portion of the film to suppress surface degradation of the film.