Development of a High-Performance TiAl Exhaust Valve

A new high-performance and lightweight TiAl intermetallic compound exhaust valve has been developed. The TiAl valve can improve power output and fuel economy by contributing higher engine speeds and a reduction in valvetrain friction. It was achieved by developing a Ti-33.5Al-0.5Si-1Nb-0.5Cr (mass%)...

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Bibliographic Details
Published in:SAE transactions 1996-01, Vol.105 (5), p.321-329
Main Authors: Maki, Kunio, Ehira, Atsushi, Sayashi, Mamoru, Sasaki, Toru, Noda, Toshiharu, Okabe, Michio, Isobe, Susumu
Format: Article
Language:English
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Summary:A new high-performance and lightweight TiAl intermetallic compound exhaust valve has been developed. The TiAl valve can improve power output and fuel economy by contributing higher engine speeds and a reduction in valvetrain friction. It was achieved by developing a Ti-33.5Al-0.5Si-1Nb-0.5Cr (mass%) intermetallic compound, a precision casting method for TiAl that provides a low-cost, high-quality process, and a plasma carburizing technique for assuring good wear resistance on the valve stem end, stem and face.
ISSN:0096-736X
2577-1531