Abstract: Disclosed is an aluminum base sintered material, in which said material comprises base powders 2 of an aluminum or an alloy thereof and numerous endless passages being formed by pores connected to each other, said pores intervening between said base powders 2 adjacent to each other, and in which said material is provided with bridging portions 3 for interconnecting said base powders 2 adjacent to each other, said bridging portions 3 having therein an eutectic structure with a hyper-eutectic compounds and with a containment of the eutectic element and the balance of aluminum.

Abstract: A stainless steel powder is mixed with at least a Ni--Mn and a Ni--Cr powder, and the powder mixture is formed by loose packing into a required configuration. The powder mixture is sintered in a non-oxidizing atmosphere at the melting point of the Ni--Mn powder or at a higher temperature thereby to obtain a porous body.

Abstract: In the manufacture of a bearing material containing an aluminum base alloy, one surface of a steel strip is washed and roughened; the aluminum base alloy is spread on the surface of the steel strip; and the aluminum base alloy and the steel strip are hot-rolled in the air to pressure-bond the former to the latter into a unitary structure. Prior to spreading the aluminum base alloy, an aluminum powder which well adheres to the steel strip may also be spread on the surface of the steel strip.