Lagerlegierung auf Al-Matrizen-Basis.

摘要

An aluminium alloy is prepared from an aluminium alloy powder having composition of: lubricating component Pb: 3 to 15 Wt%; Sn: less than or equal to 5 Wt%; hardening component Si: 1 to 12 Wt%; reinforcement component one or more selected among Cu, Cr, Mg, Mn, Zn, Fe: 0.2 to 5.0 Wt% and, remainder of aluminium as principal material or matrix; To the aluminium alloy powder set forth above, powder state Pb in 3 to 12 Wt% is added. With the mixture of the aluminium alloy power and Pb power, a billet is formed. For the billet, extrusion process is performed in a extrusion ratio greater than or equal to 40. In the extruded block, Si particle dispersed in the aluminium matrix is in a grain size smaller than or equal to 12 mu m. Furthermore, at least of half of added Pb power particle is dispersed on the sliding surface of the aluminium matrix to have greater than or equal to 0.74 of circularity coefficient which is derived from the following equation: circularity coefficient = 4Ö x (surface area of block)/(circumferential length) In case that the bearing metal is required substantially high wear-resistance, Pb phase and/or Pb alloy phase having 50 mu m of average grain size occupies greater than or equal to 85% of area ratio versus overall Pb phase and/or Pb alloy path.