简介概要

玻璃净化剂组分对Cu50Ni50合金熔体过冷度稳定性的影响①

来源期刊:中国有色金属学报2000年第1期

论文作者:郭学锋 杨根仓

文章页码:77 - 80

关键词:玻璃净化剂; Cu-Ni合金;深过冷;物理净化;化学净化

Key words:glass denucleating agent; Cu-Ni alloy melts; high undercooling; physical purification; physicochemical purification

摘    要:在高真空下,研究了净化剂B2O3, 79%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%Na2B7O4对Cu50Ni50合金熔体在循环过热过程中的过冷度及其稳定性的影响。结果表明, B2O3的净化过程为纯物理净化,合金熔体在循环过热过程中不能获得稳定的深过冷; Na-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熔体与净化剂分离,使合金熔体表面氧化,导致合金熔体同样不能获得稳定深过冷; 50%Na-Ca-Al-B-Si+50%Na2B7O4玻璃的净化过程为物理-化学复合净化,该净化剂粘度适中,合金熔体在循环过热过程中可以获得稳定深过冷。

Abstract: The undercooling and its stability of Cu50Ni50 alloy melts were investigated in vacuo using different glass slags, B2O3, 79% SiO2+12.5B2O3+2.2 %Al2O3+0.6% CaO+5.7%Na2O(simplified as Na-Ca-Al-B-Si), and 50% Na-Ca-Al-B-Si+50%Na2B7O4. The results showed that different glass slag has different denucleating mechanism. The purification of B2O3 glass is only a physical process. The alloy melts can not obtain stable undercooling during superheating-cooling cycle. Taking 79%SiO2+12.5% B2O3+2.2%Al2O3+0.6% CaO+5.7%Na2O 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%Na2B7O4 molten glass because of its appropriate viscosity.



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