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; accepted 31 July 2020 Abstract: The effect of the amount of Sn on the formation of fcc phase in Ti-13Ta-xSn (x=3, 6, 9 and 12, at.%) alloys was studied. The alloys were synthesized by mechanical alloying using a planetary mill, jar and balls of stabilized yttrium. Using Rietveld refinement, it was found that the obtained fcc phase has crystallite size smaller than 10 nm and microstrain larger than......
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采用P507(HEH/EHP)从废FCC催化剂中回收稀土 何捍卫,孟佳 (中南大学 粉末冶金国家重点实验室,湖南 长沙,410083) 摘要:废FCC催化剂(废石油催化炼化催化剂)中含有2%以上的富La或富Ce稀土,用盐酸浸取后可得到含有稀土元素和非稀土杂质的氯化稀土溶液.研究用P507(2-乙基己基膦酸单-2-乙基己基酯,HEH/EHP)从盐酸介质中萃取稀土的工艺方法,考察萃取分离稀土的主要影响因素.试验结果表明:可以从P507-煤油-盐酸体系中有效地萃取出稀土元素,较好地实现稀土元素和非稀土杂质的分离,其较优工艺条件为:萃取剂浓度(P507体积分数)为60%,浸取液pH为2.5,萃取相比为2:1,萃取平衡时间为30 min;负载有机相直接用盐酸进行反萃得到氯化稀土溶液,反萃盐酸浓度为2.0 mol/L,反萃平衡时间为60 min.该方法工艺简单,解决了废FCC催化剂的处理问题......
文章编号: 1004-0609(2006)10-1778-09 fcc, hcp和bcc结构Au的原子状态及 物理性质随温度的变化关系 陶辉锦, 谢佑卿, 彭红建, 余方新, 刘锐锋, 李晓波 (中南大学 材料科学与工程学院, 长沙 410083) 摘 要: 结合纯金属单原子(OA)理论和Debye-Grüneisen模型, 采用CALPHAD方法确定的晶格稳定参数, 研究了SGTE 纯单质数据库中fcc, hcp和bcc 结构Au的原子状态, 原子势能, 原子动能, 原子体积, 体弹性模量和热膨胀系数等物理性质随温度的变化关系. 结果表明: OA理论得到的fcc-Au电子结构中的共价d电子数最少, 从而导致fcc-Au具有最大的单键半径以及最大的原子体积; 温度上升过程中, 3种结构的原子单键半径大小顺序为: fcc>bcc>hcp, 导致相应的原......
-induced phase transformation from a face-centered-cubic (fcc) phase to a hexagonal-close-packed (hcp) phase. The transformation was studied during monotonic loading, stress-controlled high-cycle.... Key words: cobalt-based superalloy; fcc phase; in-situ loading; neutron-diffraction; hcp phase 1 Introduction ULTIMET? alloy, a cobalt-based superalloy with a nominal composition given in Table 1[1......
binder phase is fcc type. At the cooling stage of the sintering process, the phase transition of η phase, i.e. M6C→M12C and the martensitic phase transition of the cobalt based solid solution binder phase... as the property characterization of DP cemented carbide[7-12]. As is known that martensitic phase transition of the cobalt based solid solution binder phase, i.e. fcc→hcp can take place during the cooling......
高岭土在FCC催化剂中的应用 王陆军1,刘钦甫1 (1.中国矿业大学(北京)资源与安全工程学院,北京,100083) 摘要:介绍了高岭土在FCC催化剂应用中作用原理,以及国内外发展概况.论述了高岭土在半合成和全白土型催化剂合成中其原料的理化性质,产地以及酸碱改性等对产品的影响,并试图找到影响产品催化裂化性能的内在原因. 关键词:高岭土; FCC催化剂; 原位晶化; [全文内容正在添加中] ......
: (a) [111] axis zone; (b) [011] axis zone; (c) [112] axis zone of this phase was determined by indexation of crystal plane, calculation and self-consistency analysis to be face-centered cubic (FCC... Phase structure of ZK60-1Er magnesium alloy compressed at 450 ?C WANG Zhong-jun(王忠军)1, YANG Qing-xiang(杨庆祥)2, QIAO Jun(乔 军)1 1. School of Materials Science and Metallurgy, University......
-Ag, Au-Dy and Ag-Dy. The equilibrium diagram of the Au-Ag binary system is an isomorphous phase diagram including the liquid, L, and the fcc continuous solid solution, Au(Ag). The very narrow liquidus... Fig.3 Lattice parameters of Au(Ag) vs composition of alloys Au50-x/2Ag50-x/2Dyx firmed that there is a single-phase region, Au(Ag) or Ag(Au), with a fcc structure along the Au-Ag binary......
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