Oil seal ring for rotary piston engines - produced with lip formed by powder alloy melted on to ring surface for increased wear resistance

摘要

Process is such that the surface of the basic element, made from an Fe-base metallic material, is coated on the surface with a compressed alloy powder. This alloy comprises a eutectic P alloy with 4-7% P, 1-2.5 wt.% C, remainder Fe, or a eutectic Mo alloy with 10-25 wt.% Mo, 3-5 wt.% C, remainder Fe, or an alloy with 3-5 wt.% C, 2-10 wt.% Mo, 2-10 wt.% W, 5-20 wt.% Co, remainder Fe. The compressed powder is retained on the surface, heated under non-oxidising conditions for a maximum of 30 mins. at a temp. greater than alloy m.pt. and less than material surface m.pt., so that the alloy powder is molten. It is cooled to solidify as a coating which is machined to form most of the lip. Process yields wear-resistant and pore-free seal rings with flexibility to accommodate n uneven surface.