Abstract: The invention concerns a self-lubricating sintered bearing of antimony bronze, and method for its production, the bearing containing dispersed phases (3, 4, 5) which are harder than the matrix (11), of the following composition (% by weight):Sb 1.5 to 4%Sn 5 to 10% with Sn/Sb=1.3 to 3.5Cu+other elements and impurities: balance,and that its dispersed phases each consist of a diffusion halo (9, 10) in a condition of continuity with the matrix (11), said halo (9, 10) surrounding a microporosity (6, 7, 8) and being of a ternary intermetallic composition (Cu, Sn, Sb).The invention also concerns the process for the production of the self-lubricating sintered bronze bearings.

Abstract: The invention relates to cylinder liners for internal combustion engines comprising a matrix based on aluminum alloys of high mechanical strength, obtained by powder metallurgy, and methods of producing them. The liners comprise a dispersion of grains of an added intermetallic compound, apart from the dispersion of such intermetallic compounds as may exist in the alloy, the added compound having a melting temperature of over 700.degree. C. The liners are obtained by extruding or sintering a mixture of powders. The liners of the invention may be used particularly in the automobile industry and in any kind of industry where liner-piston units of good compatibility must be obtained from aluminum alloys.