| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a manufacturing method of a TiAl-made turbine rotor which precisely matches the axes of a TiAl rotor impeller excellent in heat resistance and a shaft of a steel for structural use or a heat resistant steel and the joined strength of the shaft and the rotor impeller. SOLUTION: The manufacturing method of the TiAl-made turbine rotor is executed by forming the part to be joined, of the TiAl-made turbine impeller (a) to a projecting shape and the part to be joined, of the shaft (b) to a recessing shape and inserting brazing filler metal (d) to the TiAl-made turbine impeller (a) produced with a precision casting and the rotor shaft (b) composed of the steel for structural use or the martenstic heat resistant steel. The projecting part of the TiAl-made turbine impeller (a) and the recessing part the shaft (b) part are fitted and the pressure having >=0.01kgf/mm<2> and each yield stress or lower of the shaft (b) and the rotor impeller (a), is loaded on the interface between the brazing filler metal (d) and the material to be joined. Then, the brazing is executed while heating and holding the joining interface part to the liquidus temp. or higher of the brazing filler metal (d) and the liquidus temp. + within 100 deg.C with a high frequency induction heating under inert gas atmosphere.</p> |
