Patent ID: 7824159

Claim:
A compressor for compressing air applied to a jet engine, the compressor comprising: a titanium compressor case composed of a titanium alloy; a compressor rotor arranged inside the compressor case, the compressor rotor including plural titanium rotor blades at even intervals and being rotatable around a case axial center of the titanium compressor case, wherein each of the titanium rotor blades includes a rotor blade main body composed of a titanium alloy, a deposition layer formed at a tip end portion of the rotor blade main body, the deposition layer being formed by using a first electrode composed of a first molded body molded from a powder of a cobalt-chromium alloy or a nickel alloy, or the first molded body processed with a heat treatment, generating pulsing electric discharges between the tip end portion of the rotor blade main body and the first electrode in an electrically insulating liquid or gas, and welding a material of the first electrode or a reacting substance of the material of the first electrode on the tip end portion of the blade main body by means of energy of the electric discharges, an abrasive coating having abrasiveness formed at a blade pressure side of the deposition layer, the abrasive coating being formed by using a second electrode composed of a second molded body molded from a mixed powder including a powder of a metal and a powder of a ceramic or the second electrode processed with a heat treatment, generating pulsing electric discharges between the blade pressure side of the deposition layer and the second electrode in an electrically insulating liquid or gas, and welding a material of the second electrode or a reacting substance of the material of the second electrode on the blade pressure side of the deposition layer by means of energy of the electric discharges, and fused portions respectively generated at a boundary between the deposition layer and the tip end portion of the rotor blade main body and at a boundary between the abrasive coating and the deposition layer, such that each of the fused portions includes a composition ratio grading in a thickness direction and the fused portions are 3 μm or more and 20 μm or less in thickness.