Using a coated fuel injector and method of making

Details Using a coated fuel injector and method of making Using a coated fuel injector and method of making

1996-07-11

1998-07-21

Pianalto, Bernard

Coating processes

Direct application of electrical, magnetic, wave, or...

Ion plating or implantation

2041921, 427249, 4272552, 427331, 427346, 427355, 427399, 427523, 427527, 427528, 427530, 427534, 427535, 427569, 427578, 427585, C23C 1404

Patent

active

057832617

ABSTRACT:
A method of using an amorphous carbon-based coating to extend the operating life of a fuel injector having a needle operating within a valve body, the valve body, the valve and body having steel surfaces subject to repeated impact and sliding friction contact over the operating life of the injector. The method comprises (a) providing the steel surfaces of at least one of the needle and body with an ion implanted stabilized amorphous carbon-based coating in a thickness of 1-10 micrometers, the coating having low internal stresses and low coefficient of friction independent of humidity and being stabilized by the presence of up to 30% by weight of carbide forming material selected from the group of silicon, titanium and tungsten, and (b) repeatedly and rapidly actuating the fuel injector in time periods of 0.5-1.5 micro-seconds for a single acutations thereby subjecting the valve coated surfaces to substantially continuous sliding contact and needle impact forces of 70,000-200,000 psi, the actuation being carried out in the absence of lubricious fuel at the coated surfaces whereby wear is significantly reduced by atomic transfer of coating atoms to mating surfaces during impact or sliding contact.

REFERENCES:
patent: 4554208 (1985-11-01), MacIver et al.
Synthesis, Properties, and Applications of Superhard Amorphous Coatings Applications of Diamond Films and Related Materials: Third International Conf. 1995 pp. 691-702 & 703-710 (No month avail.).

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