| 摘要 |
The turbine rotor unit comprises a ceramic rotor 1, a ceramic shaft 2 integrally united with the ceramic rotor and a metal shaft provided with a cylindrical portion 3 in which the ceramic shaft 2 is fitted. To reduce heat transfer from the ceramic shaft to the metal shaft, and minimize leakage if the shaft is broken, there is a gap 9a between a substantial part of the inner peripheral surface of the cylindrical portion 3 near the end thereof closer to the ceramic rotor and the outer surface of the ceramic shaft. The turbine rotor unit is produced by arranging on one end of the metal shaft a cylindrical portion having an inner diameter at its open end larger than at its other end, inserting the ceramic shaft into the cylindrical portion, and fixing the ceramic shaft to the cylindrical portion at its small diameter portion. |
