Abstract
A joining method of ceramic / metal shaft with high heat resistance has been developed. The joined assembly consists of ceramic shaft, cylindrical metal shaft and two kinds of brazing metals. The brazing metal which has low melting point fills in the vicinity of the open end of the clearance between the ceramic and the metal shafts, and the other one which has high melting points fills the bottom portion of the clearance. The cantilever beam flexural strength of the joint was 280 MPa at room temperature and the shear strength was about 7 MPa at 750°C. These mechanical properties, especially at elevated temperature are superior to other ordinal joining methods such as shrink fitting or active brazing method. This joining method can be applied to the joining of the ceramic turbine wheel to the metal shaft of the gas turbine which requires heat resistance up to 700°C.
