Due to the low density and high temperature strength gamma-titanium aluminide is an excellent candidate for automotive exhaust valve applications. Lighter weight valvetrain components allow either improved performance or reduction of valve spring loads that reduce noise and friction, thereby improving fuel economy. The cost of TiAl-valves must, of course, be competitive. Existing production routes developed for aircraft industry applications are very complex and expensive and hence not appropriate for an economic mass production of TiAl-valves. For this reason, a joint project carried by three research institutes and five industrial companies along the manufacturing chain has developed a new manufacturing process under the MaTech program established by the German Federal Ministry for Research and Technology. The cost saving process consist of melting and alloying using a cold crucible furnace and centrifugal casting in a preheated permanent mold in a single step. The status of the development and the first results obtained in a pilot plant are presented.
Low cost production of TiAl automotive valves using cold wall induction melting and permanent mold centrifugal casting
1997
11 Seiten, 7 Quellen
Aufsatz (Konferenz)
Englisch
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