Properties of the surface of a titanium alloy engine valve

Details Properties of the surface of a titanium alloy engine valve Properties of the surface of a titanium alloy engine valve

1995-11-30

1996-08-06

Gorgos, Kathryn

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating contains embedded solid material

205131, 205151, 205181, 205224, C25D 1500

Patent

active

055430295

ABSTRACT:
There is provided a new method of improving properties of the surface of an internal combustion engine valve made from titanium alloy, which comprises; the steps of (a) forming a surface undercoat layer of nickel on a surface of the engine valve; (b) heating the resulting nickel undercoated valve in vacuum or in an atmosphere of inert gas, at the temperature of 450.degree. C. to 600.degree. C., for one to four hours; (c) forming further a three component coat layer comprising nickel, phosphorus and particles of material selected from the group consisting of silicone carbide, silicone nitride, boron nitride, and the combination thereof, on the surface of the nickel undercoat layer; and (d) heating the resulting coat layer formed on the nickel undercoat layer, at the temperature of 350.degree. C. to 550.degree. C., for one to four hours, so as to make the particles of ceramic material uniformly and homogeneously dispersed in said coat layer.

REFERENCES:
patent: 4122817 (1978-10-01), Matlock
patent: 4902388 (1990-02-01), Fornwalt
patent: 5078837 (1992-01-01), Descamp
patent: 5116430 (1992-05-01), Hirai et al.

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