Method of making adherently sprayed valve seats

Details Method of making adherently sprayed valve seats Method of making adherently sprayed valve seats

1996-11-14

2000-01-25

Bareford, Katherine A.

Coating processes

Spray coating utilizing flame or plasma heat

Continuous feed solid coating material

427453, 427455, 427456, 219 6917, C23C 402, C23C 416

Patent

active

060175915

ABSTRACT:
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 .mu.m 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/mm.sup.2 at 450.degree. C., high wear resistance and high corrosion resistance.

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