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High-performance α-Fe/Pr2Fe14B-type nanocomposite magnets fabricated by direct melt spinning杨白1,张蕾1,沈保根2,赵同云2,于荣海11. School of Materials Science and Engineering,Beihang University2. State Key...-Fe/Pr2Fe14B-type nanocomposite magnets based on the compositions of Pr8Fe86B6 microalloyed with Co, Nb and C were fabricated by direct melt spinning. The coercivity was greatly improved from 5.5 kOe......
Influence of melt superheating on microstructures of Mg-3.5Si-1Al alloys ZHA Min(查 敏), WANG Hui-yuan(王慧远), LIU Bo(刘 波), ZHAO Bing(赵 兵), LIANG Min-li(梁敏莉), LI Dong(李 栋), JIANG Qi-chuan(姜启川) Key...: The influence of melt superheating treatment on the microstructures of Mg-3.5Si-1Al alloys unmodified and modified with 0.2% Sr-Sb (mass fraction) was investigated. The results show that when the melt......
: A computational fluid dynamics (CFD) simulation was carried out with CFX4.3 to investigate the melt flow and temperature distributions in the settler of a flash furnace. Sixteen cases of one slag tap hole adopted with one matte tap hole (1-to-1) and one slag tap hole adopted with two matte tap holes (1-to-2) operation modes were modelled. The simulation results show that the melt flows are similar in both two......
Dependence of viscosity of Cu9In4 intermetallics melt on thermal historyCHENG Sujuan, WANG Zhonghua, BIAN Xiufang, and SUI Xuepu Industry Engineering Department, Dongying Vocational College, Dongying..., China摘 要:<正>The temperature dependence of the dynamic viscosity of Cu9In4 intermetallics melt has been investigated in five kinds of different heating......
防锈油膜在5% Na2SO4溶液中的半导体导电行为 徐乃欣1,钟庆东2,周国定2,印仁和3,郑金2 (1.中国科学院上海微系统及信息技术研究所,上海,200050;2.上海电力学院电化学研究室,国家电力公司热力设备腐蚀与防护,部级,重点实验室,上海,200090;3.上海大学化学系,上海,200436) 摘要:采用电位-电容法及Mott-Schottky分析技术研究了自腐蚀电位条件下防锈油膜在5% Na2SO4溶液中失效过程的导电机制转变行为.防锈油膜在5% Na2SO4溶液中的失效过程存在半导体导电特征,随着浸泡时间的延长,防锈油膜从浸泡初期的p型半导体转变为n型半导体,转变过程中,防锈油膜中出现两个空间电荷过渡层.随着浸泡时间的延长,防锈油膜中的空间电荷层厚度皆逐渐减小,载流子密度则逐渐增加,并且计算了不同转变时期防锈油膜中的电子给体(ND)和电子受体(NA)密度大小. 关键......
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Effect of melt convection on primary dendrite arm spacing in directionally solidified Pb-26%Bi hypo-peritectic alloys HU Xiao-wu, LI Shuang-ming, GAO Si-feng, LIU Lin, FU Heng-zhi State Key... phase in directionally solidified Pb-26%Bi (mass fraction) hypo-peritectic alloys was measured by considering the effect of melt convection in cylindrical samples with different diameters......
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(A1,Mn)3Ti-2V金属间化合物的热腐蚀研究 高克玮1,桥本健纪2,乔利杰1,褚武扬1,金光熙1,李金许1,齐慧滨1 (1.北京科技大学材料物理系,北京,100083;2.日本学术振兴会,东京 102-8471,日本) 摘要:研究了(Al,Mn)3Ti-2V和TiAl在900℃的(Na,K)2SO4以硬850℃的Na2SO4+NaCl熔盐中的热腐蚀行为.结果表明,(Al,Mn)3Ti-2V在(Na,K)2SO4中的耐蚀性很好,腐蚀产物膜很薄,外层是保护性的A12O3,内层是Al2O3+TiO2+TiS的混合膜.当熔盐中存在NaCl时,(Al,Mn)3Ti-2V的耐蚀性极差,腐蚀产物的厚度比在(Na,K)2SO4中大100多倍,且具有分层结构,最外层富MnO(含少量Al2O3和TiO2),第二层为Al2O3+少量TiS,第三层为TiO2+TiS,由于不能形成保护性的Al2O3层......
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