TiAI-BASED INTERMETALLIC SINTERED COMPACT AND METHOD FOR PRODUCING TiAI-BASED INTERMETALLIC SINTERED COMPACT

Abstract

A method for producing a TiAl-based intermetallic sintered compact includes sintering TiAl-based powder to produce a TiAl-based intermetallic sintered compact. The TiAl-based powder contains a TiAl-based intermetallic compound in which Ti and Al are bonded and an additional metal. The additional metal is Ni, or Ni and Fe.

1 . A method for producing a TiAl-based intermetallic sintered compact, comprising:
 sintering TiAl-based powder to produce a TiAl-based intermetallic sintered compact, the TiAl-based powder containing a TiAl-based intermetallic compound in which Ti and Al are bonded and an additional metal, wherein   the additional metal is Ni, or Ni and Fe.   
     
     
         2 . The method for producing a TiAl-based intermetallic sintered compact according to  claim 1 , the method comprising:
 mixing the TiAl-based powder with a binder to yield a mixture;   molding the mixture into a molded product with a metal-powder injection molder;   degreasing the molded product to produce a degreased product; and   sintering the degreased product to produce the TiAl-based intermetallic sintered compact.   
     
     
         3 . The method for producing a TiAl-based intermetallic sintered compact according to  claim 1 , wherein the TiAl-based powder has a Ni content of 0.01% by weight to 1% by weight. 
     
     
         4 . The method for producing a TiAl-based intermetallic sintered compact according to  claim 1 , wherein the TiAl-based powder has a total amount of Ni and Fe of 0.01% by weight to 2% by weight. 
     
     
         5 . The method for producing a TiAl-based intermetallic sintered compact according to  claim 1 , wherein the TiAl-based powder is formed by mixing a plurality of TiAl-based solid-solution powder particles containing the TiAl-based intermetallic compound and the additional metal. 
     
     
         6 . The method for producing a TiAl-based intermetallic sintered compact according to  claim 1 , wherein the TiAl-based powder is formed by mixing a plurality of TiAl-based powder particles and a plurality of additional metal powder particles, the TiAl-based powder particles being powder particles of the TiAl-based intermetallic compound, the additional metal powder particles containing the additional metal. 
     
     
         7 . A TiAl-based intermetallic sintered compact containing a TiAl-based intermetallic compound in which Ti and Al are bonded and an additional metal that is Ni, wherein
 a Ni content is 0.01% by weight to 1% by weight of total content.   
     
     
         8 . A TiAl-based intermetallic sintered compact containing a TiAl-based intermetallic compound in which Ti and Al are bonded and an additional metal that is Ni and Fe, wherein
 a total content of Ni and Fe is 0.01% by weight to 2% by weight of total content.   
     
     
         9 . The TiAl-based intermetallic sintered compact according to  claim 8 , wherein the TiAl-based intermetallic compound contains 20 to 80% by weight of Ti, 20 to 80% by weight of Al, and 0 to 30% by weight of mixed metal, and the mixed metal contains at least one of Nb, Cr, and Mn. 
     
     
         10 . The TiAl-based intermetallic sintered compact according to  claim 8 , wherein a plurality of TiAl-based sintered powder particles containing the TiAl-based intermetallic compound and the additional metal are bonded, and an additional metal phase that is a metal phase of the additional metal exists between the TiAl-based sintered powder particles adjacent to each other. 
     
     
         11 . The TiAl-based intermetallic sintered compact according to  claim 7 , wherein the TiAl-based intermetallic compound contains 20 to 80% by weight of Ti, 20 to 80% by weight of Al, and 0 to 30% by weight of mixed metal, and the mixed metal contains at least one of Nb, Cr, and Mn. 
     
     
         12 . The TiAl-based intermetallic sintered compact according to  claim 7 , wherein a plurality of TiAl-based sintered powder particles containing the TiAl-based intermetallic compound and the additional metal are bonded, and an additional metal phase that is a metal phase of the additional metal exists between the TiAl-based sintered powder particles adjacent to each other.