Cu-Pb alloy bearing
AssigneeDaido Metal Company Ltd.
InventorsTadashi Tanaka, Masaaki Sakamoto, Koichi Yamamoto, Tsukimitsu Higuchi
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Abstract
A multi-layer bearing consists of a backing steel plate, a layer of Cu--Pb bearing alloy comprising, by weight, 1 to 20% of Ni and containing Pb-phase grains dispersed in the matrix, and an overlay of Pb alloy containing In. In in the overlay is diffused into the Pb-phase grains in the bearing alloy layer and forms a diffusion layer of high corrosion resistance in which In coexists with the Pb-phase grains, in an area of 30 to 200 .mu.m from the interface to the overlay. Even if the overlay is worn and the Cu--Pb bearing alloy layer is exposed, high corrosion resistance will be maintained.
Claims5
A multi-layer Cu--Pb corrosion resistant alloy bearing consisting of
- a backing steel plate optionally plated with Cu,
- a layer of Cu--Pb bearing alloy over the backing plate, said bearing alloy layer comprising a matrix with Pb phase grains therein, said alloy layer consisting of, by weight, 1 to 20% of Ni, 0.5 to 8% of Sn, 8 to 30% of Pb, up to 0.2% P, and balance of Cu and incidental impurities, and
- an overlay of Pb alloy containing In, wherein In in said overlay is diffused into the Pb-phase grains in the bearing alloy layer and forms a layer in which In coexists with the Pb-phase phase grains in a high concentration of 2-10 wt %, to a depth of between 30 to 200 .mu.m from the interface of the overlay and the bearing alloy layer.
A multi-layer Cu--Pb corrosion resistant alloy bearing consisting of:
- a backing steel plate optionally plated with Cu;
- a layer of Cu--Pb bearing alloy over the backing plate, said bearing alloy layer comprising a matrix having Pb-phase grains dispersed therein, wherein said bearing alloy consists essentially of, by weight, 2 to 20% of Ni, 0.5 to 8% of Sn, 8 to 30% of Pb, P in an amount up to 0.2%, and balance of Cu and incidental impurities, and
- an overlay of Pb alloy containing In, wherein In in said overlay is diffused into the Pb-phase grains in the bearing alloy layer and forms a layer in which In coexists with the Pb-phase grains in a concentration of 2-10 wt %, to a depth of between 30 to 200 .mu.m from the interface between the overlay and the bearing alloy layer.
A multi-layer Cu--Pb corrosion resistant alloy bearing consisting of:
- a backing steel plate optionally plated with Cu;
- a layer of Cu--Pb bearing alloy over the backing plate, said bearing alloy layer comprising a matrix having Pb-phase grains dispersed therein, wherein said bearing alloy essentially consists of, by weight, 10-20% of Ni, 0.5 to 8% of Sn, 8 to 30% of Pb, P in an amount up to 0.2%, and balance of Cu and incidental impurities, and
- an overlay of Pb alloy containing In, wherein In in said overlay is diffused into the Pb-phase grains in the bearing alloy layer and forms a layer in which In coexists with the Pb-phase grains, to a depth of between 30 to 200 .mu.m from the interface between the overlay and the bearing alloy layer.
Dependencies are inferred from the claim text.