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铝—铅合金是很有希望的发动机轴瓦材料,现在已采用连铸和粉末冶金工艺制成发动机钢背轴瓦。不管采用何种工艺,铝-铅(以下用Al-Pb)合金从冶金角度应有特殊的考虑,在合金凝固过程中,当第一次固相出现时,仅有1.5％的铅溶解于铝中,过量的铅呈液态微粒析出,沉淀于合金熔液中。这些析出的液态微粒由于密度不同,所以采用通常的铸造工艺不可能使它均匀地分布在铝基体中。目前采用于卧式连续铸造生产Al-Pb轴瓦合金铸成的毛坯是底部铅含量较高,而顶部铅
Aluminum-lead alloy is a promising engine bearing material and engineered steel backing bearings have now been manufactured using continuous casting and powder metallurgy. Regardless of the process used, special consideration should be given to the metallization of aluminum-lead alloys (Al-Pb alloys used below). During the solidification of the alloy, only 1.5% of the lead dissolved in the aluminum In the excess lead is liquid particles precipitation, precipitation in the alloy melt. Due to their different densities, these precipitated liquid particles can not be uniformly distributed in the aluminum matrix by the usual casting process. Currently used in horizontal continuous casting of Al-Pb bearing alloy cast billet is the bottom of the higher lead content, while the top of the lead