Method of regenerating stator vane of gas turbine and gas turbine
First Claim
1. A method of regenerating gas-turbine stator vane composed of base material and having cracks formed in the base material and oxidized layer formed at surface portion of the base material, the method comprising the steps of:
- grinding the oxidized layer and the cracks so that a part of the cracks remains thereby to form a ground portion;
filling an equivalent material and a brazing material into said ground portion thereby to form a filled portion, said equivalent material having an equality with said base material for the stator vane, and said brazing material having a melting point lower than that of said equivalent material;
heat treating said filled portion under pressurized inert gas atmosphere so as to melt the brazing material;
performing brazing treatment by diffusing the molten brazing material into the cracked portions.
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Accused Products
Abstract
A method of regenerating gas-turbine stator vane comprising the steps of: grinding the oxidized layer and the cracks 2 formed at surface portion so that a part of the cracks 2 remains; filling an equivalent material and a brazing material 4 into the ground portion, the equivalent material 3 having an equality with the base material 1 for the stator vane, and the brazing material 4 having a melting point lower than that of the equivalent material 3; heat treating the filled portion under pressurized inert gas atmosphere so as to melt the brazing material; performing brazing treatment by diffusing the molten brazing material into the cracked portions. According to the above method, the stator vane occurred with material deterioration and damages or the like due to operation of a gas turbine can be efficiently regenerated to provide a high quality without requiring to completely grinding and removing the cracks including a closed crack formed at surface of the stator vane.
33 Citations
16 Claims
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1. A method of regenerating gas-turbine stator vane composed of base material and having cracks formed in the base material and oxidized layer formed at surface portion of the base material, the method comprising the steps of:
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grinding the oxidized layer and the cracks so that a part of the cracks remains thereby to form a ground portion;
filling an equivalent material and a brazing material into said ground portion thereby to form a filled portion, said equivalent material having an equality with said base material for the stator vane, and said brazing material having a melting point lower than that of said equivalent material;
heat treating said filled portion under pressurized inert gas atmosphere so as to melt the brazing material;
performing brazing treatment by diffusing the molten brazing material into the cracked portions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification