The development of two exhaust valves for internal combustion engine, with increased performance compared to the actually used ones is presented. Some problems due to manufacturing processes still have to be solved, but the proposals present interesting perspectives of applications. One type of valve is a compound one, manufactured using a low density (Fe-based intermetallic) alloy for the stem and a heat and corrosion resistant (commercial) Ni-based alloy for the head, welded together by means of a friction technique: the advantage of a reduction of weight of a moving component in the engine is thus obtained. Another type of valve is an integral one, manufactured by means of the investment casting technology, using commercial superalloys with very high performance (high oxidation and mechanical resistance) at elevated temperature: the characteristics of the materials used allow to avoid, in most cases, both the expensive inserting of sodium into a cavity obtained into the valve and the application of a hard coating on the sealing face of the valve. Mechanical and oxidation tests at high temperature have been carried out on specimens obtained from both standard and proposed components.
Manufacturing of an exhaust valve for internal combustion engine with increased performances
Die Herstellung eines Auslaßventils für Verbrennungsmotore mit steigenden Motorleistungen
1994
8 Seiten, 3 Bilder, 7 Tabellen, 2 Quellen
Aufsatz (Konferenz)
Englisch
Manufacturing of an Exhaust Valve for Internal Combustion Engine with Increased Performances
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