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一般耐高压的铀合金鑄件,往往在试区以後发现渗漏,造成很大的浪费,并且严重的影响到各个工厂的鑄銅生产任务的完成。为了减少和補救铜合金多孔性渗漏的缺点,必须对产生多孔性的缘因有所认识。 (一)铜合金多孔性的来源 (1)铜合金在浇錴凝固时,熔点高的金属(铜)先开始凝固,彦生结晶的核心。温度继续冷却,凝固的固鑄量增多,并且沿原来的核心而长大。因为冷却速度远远地超过了它的平衡条件,也就是说高熔点的铜(溶剂)和低熔点的金属(溶质)没有充分的时间来进行互相扩散,结晶造成结晶中心的成份熔点最高,愈向外熔点愈低,成为成份不均匀的树枝组织;卽每一枝干的断面,其中心熔点最高,愈向外层熔点愈低,一层一层好像树木的年
Generally high pressure uranium alloy castings, leaks often found in the test area, resulting in a great waste, and a serious impact on the completion of each factory copper production tasks. In order to reduce and remedy the shortcomings of porous copper alloy leakage, we must understand the cause of porosity. (A) the source of copper alloy porosity (1) copper alloy pouring 錴 solidification, the high melting point of the metal (copper) began to solidify, Yansheng crystallization of the core. The temperature continues to cool, the amount of solidified cast increases, and grows along the original core. Because the cooling rate far exceeds its equilibrium conditions, that is, high melting point copper (solvent) and low melting point metal (solute) do not have enough time to diffuse each other, the crystallization caused by crystallization of the highest melting point components, the more The lower the outward melting point, become the uneven composition of the branches; 卽 each branch of the cross-section, the center of the highest melting point, the lower the melting point of the outer layer, one layer of trees like the year