| 摘要 |
PURPOSE:To manufacture the titled molded body having superior wear resistance and a low coefft. of thermal expansion by mixing atomized fine powder of a hypereutectic Al-Si alloy with metallic Si powder and/or Si3N4 powder which are coarser than the fine powder and by hot extruding the mixture. CONSTITUTION:Atomized powder of an alloy consisting of 12-35% Si, <=10% Cu, <=3% Mg and the balance essentially Al is mixed with 3-25% metallic Si powder and/or Si3N4 powder of 3-60mum average grain size, and the mixture is hot extruded in >=10 extrusion ratio. Thus, a wear-resistant extrusion-molded body of an Al-Si alloy is manufactured. The alloy consists of 12-35% Si, <=10% Cu, <=3% Mg and the balance essentially Al, and it has a structure contg. 3- 25% metallic Si grains and/or Si3N4 grains of 3-60mum average grain size dispersed in the matrix contg. distributed hyperfine proeutectic Si.
|
