PURPOSE: To provide such a single crystal turbine blade as being free from high temperature strength reduction even if it is under existence of crystal grain boundary, being healthy, having hight reliability and improved productivity.
CONSTITUTION: After a single crystal turbine blade raw material is manufactured by means of precision cast, either one kind of C, B, Zr, and Hf for reinforcing grain boundary or a plurality of elements thereof is/are allowed to invade from the surface of a turbine blade by means of dispersion treatment and ion filling, and those elements are dispersed through dispersion treatment at a high temperature, or they are stuck on the surface by means of a physical evaporation method or an ion plating method, and after that, they are allowed to invade and to be dispersed by means of dispersion treatment. It is thus possible to reinforce crystal grain boundary and sub-boundary which are formed at the time of precision casting, or crystal grain boundary which is generated by means of heating treatment after that.
YAMAMOTO MASARU
IMAI KIYOSHI
Next Patent: ROTOR AND MOVING BLADE ASSEMBLY FOR GAS TURBINE ENGINE AND MULTIPLE LAYER COATED SHIM