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本文系统的研究了碲(Te)对共晶、亚共晶及过共晶铝—硅合金的变质作用。其目的是:寻找一种新的变质剂以代替易衰退的钠(Na)及价格昂贵的锶(Sr)变质剂。研究结果指出:碲对上述合金中的共晶 Si 相均产生强烈的变质作用。对共晶 Al—Si 合金而言,加 Te 变质的金属型试棒的机械性能达到或超过加 Na 变质的水平,砂型试棒的机械性能与加 Na 变质相当;熔体的流动性与加 Na 一样.加 Te 变质时熔体保持8小时或经三次重熔后变质效果基本保持不变,用 Te 变质操作工艺简便,效果稳定、可靠、经济、没有烟雾、对坩埚无腐蚀作用。结论是:碲是 Al—Si 合金共晶 Si 相的一种性能优越的新型的长效变质剂。
In this paper, we systematically studied the metamorphism of eutectic, hypoeutectic and hypereutectic Al-Si alloys by tellurium (Te). Its purpose is to find a new modifier to replace easily decaying sodium (Na) and expensive Sr (Sr) modifiers. The results indicate that tellurium has a strong metamorphism on the eutectic Si phase in these alloys. For the eutectic Al-Si alloy, the mechanical properties of the test bars with Te metamorphism met or exceeded the level of Na metamorphism, the mechanical properties of the sand test bars were comparable to those of Na metamorphism; the melt flowability was similar to that of Na The same as in the case of Te with metamorphism, the melt remains for 8 hours or after 3 times of remelting, the metamorphic effect basically remains unchanged. The process of tempering with Te is simple, the effect is stable, reliable, economical, free of smoke and has no corrosive effect on the crucible. The conclusion is: tellurium is a new long-acting modifier of Al-Si alloy eutectic Si phase with superior performance.