METHOD FOR DEOXIDIZING Ti-Al ALLOY

Abstract

A method for deoxidizing a Ti—Al alloy includes melting and holding a Ti—Al alloy containing 40 mass % or more of Al by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa or more, thereby decreasing an oxygen content in the Ti—Al alloy. The Ti—Al alloy is manufactured using an alloy material composed of a titanium material and an aluminum material. The alloy material contains oxygen in a total amount of 0.1 mass % or more.

1 . A method for deoxidizing a Ti—Al alloy, the method comprising 
       melting and holding a Ti—Al alloy containing 40 mass % or more of Al and 0.1 mass % or more of oxygen by a melting method using a water-cooled copper vessel in an atmosphere of 1.33 Pa or more, thereby decreasing an oxygen content in the Ti—Al alloy. 
     
     
         2 . The method according to  claim 1 , wherein a CaO—CaF 2  flux prepared by blending from 35 to 95 mass % of calcium fluoride with calcium oxide is added before or during the melting of the Ti—Al alloy. 
     
     
         3 . The method according to  claim 1 , wherein the melting method using the water-cooled copper vessel is any one of an arc melting method, a plasma arc melting method, and an induction melting method. 
     
     
         4 . The method for deoxidizing a Ti—Al alloy according to  claim 2 , wherein the melting method using the water-cooled copper vessel is any one of an arc melting method, a plasma arc melting method, and an induction melting method.