Titania-alumina-yttria piston ring facing

Details Titania-alumina-yttria piston ring facing Titania-alumina-yttria piston ring facing

1979-09-12

1981-02-03

McCarthy, Helen M.

Seal for a joint or juncture

Seal between relatively movable parts

Relatively rotatable radially extending sealing face member

106 732, 106 7333, 106 734, 277235A, 427 34, 427423, 428472, C04B 3544, C04B 3546, F16J 922

Patent

active

042484405

ABSTRACT:
Disclosed is a coating for bearing faces of piston rings and a powder composition for plasma spray application of such coating. The plasma spray powder comprises 94%-98% by weight of aluminum oxide and titanium oxide and 2%-6% by weight of yttrium oxide. The inclusion of yttrium oxide in the aluminum oxide-titanium oxide coating composition reduces the tendency of the coating to blistering and spalling which resulting in coating loss during use of the ring. Intra-coating delamination is substantially reduced or eliminated.

REFERENCES:
patent: 3697091 (1972-10-01), Prasse et al.
patent: 3822338 (1974-07-01), Merker
patent: 4106782 (1978-08-01), Hyde et al.
patent: 4118240 (1978-10-01), Takabatake
patent: 4180622 (1979-12-01), Burkhard et al.
patent: 4181532 (1980-01-01), Woodhead
patent: 4194917 (1980-03-01), Sakemi et al.
Wilms, V. et al., "Plasma Spraying of Al.sub.2 O.sub.3 and Al.sub.2 O.sub.3 -Y.sub.2 O.sub.3 " Thin Solid Films-39-(1976), pp. 251-262.

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