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锡青铜是一种古老的铸造合金。现代锡青铜是在古代青铜的基础上发展起来的。为了缩小合金的结晶温度范围,改善铸造性能,在青铜中加入了锌。锌固溶于铜,不形成新相(锌的锡当量为0.5)。为了提高致密性,改善加工性能而加入了铅。铅不论在固体状态和液体状态均不溶于铜。铅以独立相存在于青铜中。青铜中加了锌铅并没有从根本上改变它的凝固特性,仍是按糊状凝固方式凝固的合金。现代锡青铜的常用牌号有以下几种:ZQSn5-5-5,ZQSn6-6-3,ZQSn3-12-5及ZQSn10-1。 1.凝固方式从铜——锡平衡图(铸态)可以看出(图1),锡青铜结晶温度范围很宽。在砂型铸造
Tin bronze is an ancient cast alloy. Modern tin bronze was developed on the basis of ancient bronze. In order to reduce the crystallization temperature range of the alloy and improve casting performance, zinc is added to the bronze. Zinc solid solution in copper, do not form a new phase (tin tin equivalent of 0.5). In order to improve the density, improve the processing performance and added lead. Lead is insoluble in copper both in the solid state and in the liquid state. Lead exists in bronze as an independent phase. Zinc and lead added to the bronze does not fundamentally change its solidification properties, is still solidified by paste-like solidification alloy. Common brands of modern bronze are the following: ZQSn5-5-5, ZQSn6-6-3, ZQSn3-12-5 and ZQSn10-1. 1. Solidification Method As can be seen from the copper-tin balance diagram (Fig. 1), the tin bronze crystallization temperature range is very wide. Casting in sand mold