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影响青铜铸件质量的原因之一,是由于铜合金内存有夹杂物.这些夹杂物,大都是由于合金中各元素及其他杂质氧化而生成.氧化铝、氧化锡、氧化矽和氧化铅等,都不能熔解于铜合金熔液内,而且这些氧化物的热膨胀系数也和铜合金的热膨胀系数不同,因此当铜合金冷却凝固时,在铸件中就形成了微细的小孔.这样不仅降低了铜合金的机械强度,同时也破坏了铸件的精密性.
One of the reasons that influence the quality of bronze castings is due to the inclusions existing in the copper alloy, which are mostly formed by the oxidation of various elements and other impurities in the alloy, such as alumina, tin oxide, silicon oxide and lead oxide Can not be melted in the molten copper alloy, and the thermal expansion coefficient of these oxides and copper alloy thermal expansion coefficient is different, so when the copper alloy cooling and solidification, the formation of fine castings in the hole.This not only reduces the copper alloy The mechanical strength, but also undermined the precision casting.