Insulator on spark plug electrode coated with zirconium and vana

Details Insulator on spark plug electrode coated with zirconium and vana Insulator on spark plug electrode coated with zirconium and vana

1979-05-30

1981-05-12

Segal, Robert

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

313141, H01T 1320

Patent

active

042674832

ABSTRACT:
A spark plug for an internal combustion engine comprises (a) an insulator surrounding a central electrode and (b) a housing having a grounded electrode and disposed on the periphery of the insulator. A taper-nose portion of the insulator, which is designed to be exposed to unburnt carbon in combustion gases of a combustion chamber, is modified to facilitate carbon removal from the taper-nose portion and to maintain excellent electrical insulation. The modification comprises a coating of a mixture of vanadium oxide and zirconium oxide in the form of a porous layer or a sponge-like porous layer having an irregularly-shaped structure with pores; it is fixed to the exposed surface of the taper-nose portion to improve the self-cleaning ability of the spark plug without decreasing the degree of electrical insulation provided by the insulator. The coating of the mixture having the porous structure is formed by applying a suspension of the mixture to the taper-nose portion of the spark plug and by drying the same in situ. The resulting coating is then heated further to obtain a more adherent coating of increased durability and better self-cleaning ability.

REFERENCES:
patent: 2899585 (1959-08-01), Dollenberg
patent: 3252034 (1966-05-01), Preist et al.
patent: 3365605 (1968-01-01), Linstedt

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