Patent ID: 7241416

Claim:
A process for axially bonding the hub ( 109 ) of a titanium aluminide (TiAl) turbine rotor ( 103 ) to a steel shaft ( 107 ) of a rotor shaft assembly ( 101 ) of a type used in a turbocharger for rotating about its axis ( 111 ) to drive a compressor, said process comprising: (a) axially mounting a compact ( 207 ) of said shaft ( 107 ), comprising a steel powder admixed with a binder, to the hub ( 209 ) of a compact ( 203 ) of said rotor ( 103 ), comprising a TiAl powder admixed with a binder, with a bonding material ( 211 ) comprising a binder admixed with fine metallic powder disposed between said proximal end of said shaft compact ( 207 ) and said hub ( 209 ) to form a mounted compact ( 201 ), and (b) debinding and sintering said mounted compact ( 201 ), whereby said rotor ( 103 ) and said shaft ( 107 ) are bonded to form said rotor shaft assembly ( 101 ).