Joining Method with High Heat Resistance for Ceramic Rotors
A method of joining a ceramic shaft to a cylindrical metal shaft with high heat resistance has been developed, which is referred to as a multi-fulfilling fitting The multi-fulfilling fitting is a kind of shrink fitting with brazing filler metals. It features the use of two kinds of brazing metals with different melting points. At the first stage, the ceramic shaft and the cylindrical metal shaft were shrink-fitted by filling a brazing metal with a higher melting point in the bottom clearance between the cramic shaft and the metal shaft. The joining was completed to fill a brazing metal with a lower melting point in the upper portion of the clearance.
The flexural strength of the joining body was 330 MPa at room temperature and the slip resistance was 7 kN at 750°C. These mechanical properties, especially at elevated temperatures, are superior to those of other joining methods such as the conventional shrink fitting and the active brazing method.
The multi-fulfilling fitting can be applied to the joining of the cramic turbine wheel to the metal shaft of a gas turbine engine which requires heat resistance up to about 700°C.
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