玻璃净化剂组分对Cu50Ni50合金熔体过冷度稳定性的影响

在高真空下，研究了净化剂Ｂ２Ｏ３，８９％ＳｉＯ２＋１２．５％Ｂ２Ｏ３＋２．２％Ａｌ２Ｏ３＋０．６％ＣａＯ＋５．７％Ｎａ２Ｏ（简写为Ｎａ－Ｃａ－Ａｌ－Ｂ－Ｓｉ）和５０％Ｎａ－Ｃａ－Ａｌ－Ｂ－Ｓｉ＋５０％ｎａ２Ｂ８Ｏ４对Ｃｕ５０Ｎｉ５０ｘ合金溶体在循环过热过程中的过冷度及其稳定Ｃａ－Ａｌ－Ｂ－Ｓｉ玻璃的净化过程为物理－化学复合净化，但由于该净化剂粘度大，在循环过热的冷却过程中因发生合金溶体与净化剂分离

Effect of glass composition on undercooling stability of Cu_(50)Ni_(50) alloy melts

The undercooling and its stability of Cu 50 Ni 50 alloy melts were investigated in vacuo using different glass slags, B 2O 3, 79% SiO 2 12.5 B 2O 3 2.2% Al 2O 3 0.6% CaO 5.7% Na 2O(simplified as Na Ca Al B Si), and 50% Na Ca Al B Si 50% Na 2B 7O 4. The results showed that different glass slag has different denucleating mechanism. The purification of B 2O 3 glass is only a physical process. The alloy melts can not obtain stable undercooling during superheating cooling cycle. Taking 79% SiO 2 12.5% B 2O 3 2.2% Al 2O 3 0.6% CaO 5.7% Na 2O as purifying agent, the denucleating mechanism is a comprehensively physicochemical process. Yet the stability of undercooling is still low because of the separation between melt and glass occurred during cooling process of superheating cooling cycle. Stable undercooling can be obtained by physicochemical denucleating processes of 50% Na Ca Al B Si 50% Na 2B 7O 4 molten glass because of its appropriate viscosity.