Surface treatment method and repair method
A method for forming a dense coating on a limited region of a subject body is disclosed. The method is composed of the steps of: applying one selected from the group of a compressed body of a powder of a metal and a sintered compressed body of a powder of a metal to a working electrode; executing discharge deposition to deposit a first coating from the working electrode on the subject body by applying the subject body as a workpiece of the discharge deposition; executing discharge deposition to deposit a second coating from the working electrode on the first coating by applying the subject body as a workpiece of the discharge deposition; and heating the subject body in one selected from the group of a vacuum, an air and an oxidizing atmosphere so as to densify the second coating or oxidizing the second coating at least in part to generate a solid lubricant substance.
1. A method for forming a coating on a limited site of a subject body, comprising:
applying one selected from the group of a compressed body of a powder of a metal and a sintered compressed body of a powder of a metal to a working electrode;
executing discharge deposition to deposit a first coating from the working electrode on the subject body by applying the subject body as a workpiece of the discharge deposition;
executing discharge deposition to deposit a second coating from the working electrode on the first coating by applying the subject body as a workpiece of the discharge deposition; and
heating the subject body in one selected from the group of a vacuum, an air and an oxidizing atmosphere so as to densify the second coating or oxidizing the second coating at least in part to generate a solid lubricant substance.
2. The method of claim 1 , further comprising:
filling a solid lubricant material in pores included in the coating before the step of heating.
3. The method of claim 2 , wherein the solid lubricant material consists essentially of one selected from the group of hBN, MoS 2 , BaZrO 3 and Cr 2 O 3 .
4. A component for a gas turbine engine, comprising the subject body of claim 1 .
5. A gas turbine engine comprising the component of claim 4 .
6. A method for producing a product repaired from a subject body including a defect, the method comprising;
removing a portion defining the defect of the subject body;
applying one selected from the group of a compressed body of a powder of a metal and a sintered compressed body of a powder of a metal to a working electrode;
executing discharge deposition to deposit a buildup from the working electrode on the subject body by applying the subject body as a workpiece of the discharge deposition; and
heating the subject body in one selected from the group of a vacuum, an air and an oxidizing atmosphere so as to densify the buildup or oxidizing the deposition at least in part to generate a solid lubricant substance.
7. The method of claim 6 , further comprising:
filling a solid lubricant material in pores included in the buildup before the step of heating.
8. The method of claim 7 , wherein the solid lubricant material consists essentially of one selected from the group of hBN, MoS 2 , BaZrO 3 and Cr 2 O 3 .
9. A component for a gas turbine engine, comprising the subject body of claim 6 .
10. A gas turbine engine comprising the component of claim 9 .