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Bnf Metals Technology Centre

Charles Grant Purnell

Henry Dickinson

Aluminium-silicon powder mixtures comprising a hypereutectic Al&#x2014;Si powder, a near eutectic Al&#x2014;Si powder, and a third powder which is aluminium or a hypoeutectic aluminium alloy containing alloying constituents other than silicon and less than 9 wt % silicon, with a sintering aid comprising a fourth, zinc-containing powder, are pressed and sintered to provide powder metallurgy products suitable for automotive component use in particular. The third powder in the composition permits such Al&#x2014;Si powder mixtures to be compressed to a density approaching that obtained by use of an annealed powder mixture, but without the annealing step.

Aluminium alloy products having a pre-sintered density of at least 90% theoretical, and methods of making such alloy products

A zinc/aluminum alloy feedstock containing 18-30% by weight Al, 0.003-0.2% by wt. Mg, 0.5-2.5% by wt. Cu, 0.02-0.5% by wt. Fe, 0-0.1% by wt. Si, Zn balance (including any impurities) is capable of achieving high plasticity at temperatures of 240.degree. C. or above after being subjected to a multistage heat treatment including an extrusion step.

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Wantage, United Kingdom

Charles Grant Purnell