Self-lubricating and wear resistant valve/valve guide combinatio

Details Self-lubricating and wear resistant valve/valve guide combinatio Self-lubricating and wear resistant valve/valve guide combinatio

1996-08-28

1998-10-13

Ferensic, Denise L.

Fluid handling

Processes

251368, 251355, E03B 100

Patent

active

058197745

ABSTRACT:
A self-lubricating and wear resistant valve/valve guide combination for an engine includes a self-lubricating coating deposited on one of (a) the inner surface of the valve guide, or (b) the outer surface of the valve stem. A wear-resistant coating deposited on one of (a) the outer surface of the valve stem when the self-lubricating coating is deposited on the inner surface of the valve guide, or (b) the inner surface of the valve guide when the self-lubricating coating is deposited on the outer surface of the valve stem. The self-lubricating coating has a composition, by weight, consisting essentially of, (a) a first component, comprising, a metal-bonded chromium carbide in the range of about 60% to about 80%, (b) a second component, comprising, a soft noble metal in the range of about 1% to about 20%, and (c) a third component, comprising, a metal fluoride eutectic in the range of about 5 to about 20%. The wear-resistant coating has a composition, by weight, consisting essentially of, (a) chromium in the range of about 20% to about 30%, (b) nickel in the range of about 5% to about 15%, (c) tungsten in the range of about 1% to about 10%, and (d) cobalt in the range of about 50% to about 74%.

REFERENCES:
patent: 4546737 (1985-10-01), Kazuoka et al.
patent: 4597367 (1986-07-01), Hayashi
patent: 4763876 (1988-08-01), Oda et al.
patent: 4787736 (1988-11-01), Mori et al.
patent: 5069422 (1991-12-01), Kawamura
patent: 5517956 (1996-05-01), Jette et al.

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