Adherently sprayed valve seats

Details Adherently sprayed valve seats Adherently sprayed valve seats

F - Mech Eng,Light,Heat,Weapons

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F01L 3/04 (2006.01) B23H 9/00 (2006.01) C23C 4/00 (2006.01) C23C 4/02 (2006.01) C23C 4/06 (2006.01) F01L 3/22 (2006.01) F02F 1/24 (2006.01) F02F 1/42 (2006.01)

Patent

CA 2221229

A method of defining valve seats on valve seat supports of an internal combustion engine head. The method includes steps of; (a) roughening the exposed surface of the valve seat support to a finish of 10-50 µm RA; (b) thermally spraying a stream of composite particles onto the roughened support surface, using gaseous propellants with sufficient heat and force to produce a dense adherent composite coating of metal and metal oxide particles and to a thickness no greater than 1-1.5 mm; and (c) finish machining if necessary, the sprayed coating to define the valve seat surface. The composite coated product consists of a metal/metal oxide mixture that possesses one or more of the following characteristics: a surface porosity of 2-5%, a density of 6.5-8 grams/cc, a Vickers hardness of about 280 kg/mm2 at 450°C, high wear resistance and high corrosion resistance.

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