Ceramic composite valve for internal combustion engines and...

Details Ceramic composite valve for internal combustion engines and... Ceramic composite valve for internal combustion engines and...

F - Mech Eng,Light,Heat,Weapons

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25/135, 117/162,

F01L 3/02 (2006.01) C04B 35/80 (2006.01) C04B 35/84 (2006.01) F02F 7/00 (2006.01)

Patent

CA 2023985

ABSTRACT OF THE DISCLOSURE A ceramic composite valve for an internal combustion engine or the like is disclosed. The valve includes (a) an elongated valve stem shaped for insertion in the valve guide of an engine and comprising a ceramic sleeving which is packed with an axially aligned unidirectional cluster of ceramic reinforcing fibers; and (b) a ceramic bell shaped for mating with the valve seat of an engine and containing discontinuous ceramic fibers; one end of said sleeving being molded into the bell to form a valve-shaped structure; and said valve shaped structure being impregnated and rigidized with a matrix of carbon, other ceramic material, or both carbon and other ceramic material, and coated with a hard ceramic coating which is resistant to oxidation and wear. Also disclosed are various preform valves, and a method of making ceramic valves and preform valves.

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