共查询到20条相似文献,搜索用时 78 毫秒
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简要介绍了用外吸气法,真空法和 电迁移法除去难熔金属晶隙内氧、氮、氢和碳一类杂质的固态精炼提纯方法,并对热迁移法除杂的可行性进行了讨论。 相似文献
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国外高纯难熔金属的现状 总被引:5,自引:0,他引:5
高纯难熔金属的研制是国外极为重视的课题之一,其内容包括微量和超微量元素的作用、提纯方法、工艺和设备、防止加工处理过程中的污染、微量和超微量元素的分析以及在高技术领域中的应用。本文对国外高纯难熔金属的应用、要求、研究、生产和分析等问题进行了综合论述。 相似文献
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粉末注射模法(PIM)是目前旨在改善难熔金属制品挠性而迅速发展的一项技术。这是美国宾夕法尼亚州州立大学的RandGerman教授在第14届国际普兰西会议上就非传统粉末成形方法专题讨论时的发言。German教授概述了PIM方法及其应用现状,着重介绍了注... 相似文献
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介绍了近年来铁水预处理用耐火材料的发展现状和国内外的最新研究成果,分析了铁水预处理容器中脱Si、脱P、脱S工艺间的相互关系以及不同处理剂对内衬材料的主要侵蚀反应,提出了改进铁水预处理耐火材料的建议,并展望其未来的发展方向. 相似文献
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机械合金化制备金属难熔化合物 总被引:2,自引:0,他引:2
在介绍机械合金化特点的同时,重点研究和讨论了机械合金化制备金属难熔化合物的过程及机理,并认为机械合金化是制备难熔化合物及其材料的一种行之有效的方法。 相似文献
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Recrystallization of Single Crystal Nickel-Based Superalloy 总被引:1,自引:0,他引:1
A series of experiments of investigating the recrystallization of single crystal DD3 superalloy were carried out. The threshold temperature for recrystallization and the effect of annealing temperature on recrystaUization were studied. The results show that the threshold temperature for recrystallization of the shot-peened DD3 samples is be-tween 1 000 ℃ and 1 050℃ under the condition of annealing for 2 h, and the recrystallization depth increases with the rise of the annealing temperature. Below 1 150 ℃, the recrystallization depth increases slowly with the tempera-ture climbing, while above 1 150 ℃, the recrystallization depth increases quickly with the rise of the temperature. The solution of the γ' phase is a critical factor of the recrystallization behavior of DD3 superalloy. In addition, the ki-netics and microstructural evolution of recrystallization at 1 200 ℃ were also studied. It is found that the recrystalli-zation progresses rapidly at 1 200℃ through the growth of fully developed recrystallized grains, and the recrystalli-zation process on the shot-peened surface is similar to that of wrought materials, including nucleation of reerystalliza-tion, growth of new grains into the matrix, and growth of new grains by swallowing up each other. 相似文献
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热镀Galfan合金的现状与发展 总被引:6,自引:0,他引:6
热镀是全世界使用的最广泛的、最基本的防腐方式之一,普遍用作金属制品的表面处理。而Galfan合金作为一种新型的防腐镀层,具有优良的性能必将取代现有的纯镀锌层。主要介绍了Galfan合金镀层的特点,现状与发展。 相似文献
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Recrystallization of a Single Crystal Nickel-Base Superalloy 总被引:2,自引:0,他引:2
A series of experiments of investigating the recrystallization of single crystal DD3 superalloy were carried out. The threshold temperature for recrystallization and the effect of annealing temperature on recrystallization were studied. The results show that the threshold temperature for recrystallization of the shot peened DD3 samples is between 1 000 ℃ and 1 050 ℃ under the condition of annealing for 2 h, and the recrystallization depth increases with the rise of the annealing temperature. Below 1 150 ℃, the recrystallization depth increases slowly with the temperature climbing, while above 1 150 ℃, the recrystallization depth increases quickly with the rise of the temperature. The solution of the γ′ phase is a critical factor of the recrystallization behavior of DD3 superalloy. In addition, the kinetics and microstructural evolution of recrystallization at 1 200 ℃ were also studied. It is found that the recrystallization progresses rapidly at 1 200 ℃ through the growth of fully developed recrystallized grains, and the recrystallization process on the shot peened surface is similar to that of wrought materials, including nucleation of recrystallization, growth of new grains into the matrix, and growth of new grains by swallowing up each other. 相似文献
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介绍了熔盐电脱氧法制备难熔金属及合金的基本原理和工艺,分析了熔盐电脱氧法的优势及目前存在的主要问题,归纳了采用熔盐电脱氧法制备难熔金属及合金的研究进展,指出了该制备工艺的发展趋势,并对其推广应用和实现大规模工业化前景等进行了讨论. 相似文献