材料期刊网

Gibbs Free Energy of Formation of 3Y_2O_3·5Al_2O_3

XU Xiuguang WANG Changzhen TU Ganfeng Northeast University of Technology , Shenyang , China.

材料科学技术（英）

Thermodynamic properties of 3Y_2O_3·5Al_2O_3 double compound have been determined with CaF_2 single crystal electrolyte galvanic cell at 1049 K to 1230 K.The galvanic cell used can be expressed as: Pt,O_2(g)丨Y_2O_3(s),YOF_((s))丨CaF_2丨YOF_((s)), 3Y_2O_3·5Al_2O_(3(s))丨Al_2O_(3(s))丨O_2(g),Pt, of which the cell reaction is; 3Y_2O_(3(s))+SAl_2O_(3(s))=3Y_2O_3·SAl_2O_(3(s)) The following result is obtained: A_fG°(3Y_2O_3·5Al_2O_3)=-939500+765.90T±710J/mol where,△fG°(3Y_2O_3·5Al_2O_3)is the free energy of formation of 3Y_2O_3·5Al_2O_3 from Y_2O_3 and Al_2O_3.

关键词: rare earth , null , null

University of Science and Technology Beijing

JIA Shizhen University of Science and Technology Beijing , China.

材料科学技术（英）

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Abstracts of papers from Journal of University of Science and Technology Beijing

稀有金属（英文版）

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Huazhong University of Science and Technology(H.U.S.T)

材料科学技术（英）

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Two-step magnetization in a spin-chain system on the triangular lattice: Wang-Landau simulation

Physical Review B

The Wang-Landau algorithm is used to study the thermodynamic and magnetic properties of triangular spin-chain system based on two-dimensional Ising model in order to understand the magnetic-order dynamics in Ca(3)Co(2)O(6) compound. The calculated results demonstrate that the equilibrium state of the rigid spins produces the two-step magnetization curve at low temperature even when the random-exchange term is considered. This work indicates that the four-step magnetization behavior observed experimentally must be due to the nonequilibrium magnetization.

关键词: calcium compounds;exchange interactions (electron);Ising model;magnetisation;thermodynamics;one-dimensional ca3co2o6;density-of-states;compound ca3co2o6;phase-diagram;proteins;crystal

退火条件对AgCuNi/TU1复合界面的影响

李佩 , 周世平 , 刘少斌 , 刘绍虎 , 陈丽华 , 王健

贵金属 doi:10.3969/j.issn.1004-0676.2010.03.003

采用轧制复合法制备AgCuNi/TU1复合带材,使用EDS能谱仪分析不同退火条件下复合界面元素的扩散情况,利用两端不受扩散影响的扩散偶模型和Arrenius关系计算退火温度在550～750℃下Ag在TU1中的扩散系数、扩散常数与扩散激活能.结果显示:退火温度在550～750℃之间,分钟级退火时间下(退火时间<5 min),AgCuNi/TU1复合界面主要发生表面原子扩散,且扩散系数和扩散常数在同一数量级,而扩散激活能有明显差别.

关键词: 金属材料 , 复合材料 , 扩散系数 , 扩散常数 , 扩散激活能

AgCuCe/TU1层状复合材料扩散退火工艺研究

乔勋 , 王健 , 周世平 , 贺晓燕 , 李林修

贵金属 doi:10.3969/j.issn.1004-0676.2009.02.002

用室温固相轧制复合法制备了AgCuCe/TU1层状复合材料,研究了不同扩散退火工艺对AgCuCe/TU1界面结合性能的影响,测定了复合材料复层和基体的硬度,观察了试样的界面微观组织.结果表明:600 ℃/0.5 h扩散退火可以改善界面结合状态和界面附近组织形貌,获得充分的再结晶组织和致密的界面结合状态;700 ℃/0.5 h扩散退火在界面处形成细晶区和孔洞;750 ℃/0.5 h扩散退火使AgCuCe/TU1在界面处形成氧化物夹杂,严重损害界面结合性能.

关键词: 金属材料 , 复合材料 , 扩散退火 , 界面 , 显微组织

欢迎投稿、订阅《Journal of Wuhan University of Technology-Materials Science Edition》

武汉理工大学学报-材料科学版(英文版)

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Titanium technology in the USA - an overview

D.Eylon , S.R.Seagle

材料科学技术（英）

The state of Ti research, development and industry is reviewed in this article. The fifty-year anniversary of Ti technology commercialization in the USA provides an opportunity for a historical perspective. Incorporation of "information-age" tools into alloy development, processing, and production invigorates the technology. Consolidation, diversification and globalization have been transforming the Ti industry in the recent years.

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CPB和TU对X70钢在含SO2酸性溶液中的缓蚀作用

何晓英 , 邓海英 , 李容

腐蚀科学与防护技术 doi:10.3969/j.issn.1002-6495.2005.04.007

采用交流阻抗法和极化曲线法研究了溴代十六烷基吡啶(CPB)和硫脲(TU)在复配前后对X70钢在H2SO3溶液中的缓蚀作用.研究发现:H2SO3的浓度为10 mmol/L、pH=3.7的HAc-NaAc缓冲体系中,溴代十六烷基吡啶(CPB)与硫脲(TU)的缓蚀率随着浓度的增加而增加,溴代十六烷基吡啶(CPB)的浓度达到5×10-6kg/L时的缓蚀性能最佳,而硫脲(TU)的浓度达到50×10-6kg/L时的缓蚀性能最佳.复配实验结果表明:当缓蚀剂的总浓度为25×10-6kg/L,溴代十六烷基吡啶(CPB)和硫脲(TU)复配质量浓度比为1:1时缓蚀效果最好.

关键词: 溴代十六烷基吡啶 , 硫脲 , 协同缓蚀 , X70钢 , 电化学阻抗谱