Determination of isothermal section of Ag-Ti-Zr ternary system at 1 023 K

The isothermal section of Ag-Ti-Zr ternary system at 1023 K was determined by diffusion triple and electron probe microanalysis. The results indicate that four binary intermetallic phases of AgTi, AgTi2, AgZr and AgZr2 are found in Ag-Ti-Zr ternary system at 1 023 K. AgZr2 and AgTi2 form a continuous solid solution, namely Ag(Ti,Zr)2. Four three-phase regions: AgTi AgZr Ag, AgTi AgZr Ag (Ti, Zr)2, α-Zr β(Ti, Zr) Ag (Ti, Zr) 2 and α-Ti β(Ti, Zr) Ag (Ti, Zr)2 exist in the isothermal section. No ternary compound is observed.     

三元四元简单水盐体系相图的自动分析及绘制

通过分析水盐体系中自由度及相图中点与线的关系,研究了能够自动分析相图中点与线的算法.此算法能利用相图数据点上的液相离子组成和平衡固相分析出点的类型及点之间的连线关系.并基于此算法开发了相图绘制程序,此程序能够自动分析并绘制三元和四元简单体系的等温相图.     

三元体系Na_2CO_3-K_2CO_3-H_2O 298 K 相关系和溶液物化性质的研究

用等温溶解平衡法研究了三元体系Na2CO3-K2CO3-H2O 298K时的相平衡关系和平衡溶液的物化性质(密度、折光率、粘度、pH值).该三元体系为复杂三元体系,形成了一种新的复盐Na2CO3.K2CO3.H2O.用经验公式对平衡液相的密度、折光率进行了计算,计算值与实测值吻合得较好.     

R-Fe-Co赝三元系RFe2-RCo2变温截面的研究(R=Sm0.5Dy0.5)

采用光学金相显微镜、X射线衍射和差热分析技术研究了R－Fe-Co赝三元系RFe2-RCo2变温截面（R＝Sm0.5Dy0.5）。该截面由2个单相区、2个单相区、2个两相区与2个三个区组成。截面含有两个包晶反应：L＋2：7→1：3与L＋1：3→1：2．（Sm,Dy)(Fe,Co)2相的点阵常数随含Co量的增加而降低。     

F113、F114、F112三元体系的分离

通过间歇精馏实验，摸索了分离Ｆ１１３、Ｆ１１４、Ｆ１１２三元体系的过程参数。用Ｗｉｌｓｏｎ模型，ＰＲＯⅡ模拟软件，对该体系进行了模拟计算。计算结果与实验结果一致，说明Ｗｉｌｓｏｎ模型能较好地反映该三元体系的汽液平衡关系，这一结果为工业设计提供了依据。     

1600℃Mo-Si-C三元系组元化学势相图及其应用

收集并计算了Mo-Si-C三元系在1600℃下各组元化合物的热力学数据．利用Mo-Si-C三元系在该温度下的平衡相图以及收集计算的该三元系的热力学数据，计算了该三元系中各组元的化学势并作出了相应的化学势稳定性相图．讨论了热力学、物质平衡和动力学原则在固态置换反应原位合成复合材料中的应用．这些原则应用于MoSi2-SiC复合材料的原位合成．可以确定反应起始物的物种和成分．原位合成MoSi2-SiC复合材料的反应起始物为Mo2C和Si，利用Mo-Si-C三元系1600℃下的平衡相图和组元化学势稳定性相图分析了固态置换反应原位合成MoSi2-SiC复合材料可能的反应路径．     

Ti-Si-C三元系化学势稳定性相图及其应用

根据Ti-Si-C三元系在1200℃下各组元化合物的热力学数据和Ti-Si-C三元系在该温度下的平衡相图，计算了该三元系中各组元的化学势并作出了相应的化学势稳定性相图，结合平衡相图和热力学、动力学、物质平衡原则，应用于分析和预测固态置换反应原位合成Ti3SiC2-SiC复合材料反应路径中。     

恒压下邻、间、对硝基氯苯三元体系汽液平衡研究

用自行设计的平衡釜测定了邻、间、对硝基氯苯三元体系于100mmHg 柱恒压下的汽液平衡数据。根据热力学相平衡原理,计算出各组分液相活度系数,证明了该三元体系为完全理想系.另外又通过牛顿迭代法计算出平衡温度和汽相组成,计算结果和实测数据符合良好,能够满足工程设计的需要。     

Thermodynamic analysis of the Ti-Al-N system

Motivated by the application of (Ti, Al)N alloy compound in the coating layer, the ternary phase diagram of Ti-Al-N was analyzed by the calculation of the phase diagram (CALPHAD) technique. The isothermal sections of the Ti-Al-N ternary system were constructed and compared with the literature experimental results. The thermodynamic parameters of the Ti-Al-N ternary sys- tem and the related Ti-N and Al-N binary systems were adopted from literatures, whereas, those of the Ti-Al binary from the literatures were adjusted according to both the ternary and the binary phase equilibria. The consistency between the calculated results and the experimental data shows that considering the ternary thermodynamic relationship, the adjustments to the thermodynamic parameters of the related binaries are necessary.     

298K时KCl—K2CO3—K2B4O7—H2O相平衡及平衡液相物化性质的研究

采用等温溶解平衡法研究了298 K时KCl-K2CO3-K2B4O7-H2O体系的相平衡及平衡液相物化性质(密度、粘度、折光率、电导率、pH),该体系298 K等温溶解度图有3个相区KCl,K2CO33/2H2O,K2B4O7*4H2O,1个共饱点,3条单变量曲线,该体系属简单四元体系.由渗透系数及三元体系溶解度数据拟合了有关K2B4O7的Pitzer方程参数,并运用Pitzer方程对该四元体系溶解度进行理论计算,计算值与实验值基本吻合.     

输电线路平断面测量数字化系统的开发应用

随着对测绘仪器及道亨软件功能的广泛使用,运用VB结合AutoCAD及Excel的图形数据功能编写＂输电线路平断面测量数字化系统＂程序,通过反复试验和生产检验,该系统能满足生产需要.使用该系统可以实现输电线路平断面测量内外业数字一体化,极大地提高功效,减轻生产人员的劳动强度.     

Na+,Mg2+//SO42-,B4O72--H2O 交互四元体系288K时相平衡研究

采用等温溶解平衡法研究了288K时Na~+,Mg~(2+)//SO_4~(2-),B_4O_7~(2-)-H_2O四元交互体系的相平衡关系,测定该体系在288 K时平衡液相的溶解度和密度.依据实验测定的平衡溶解度数据及对应的平衡固相,绘制了该四元体系的平衡相图以及其密度-组成图.研究结果表明:交互四元体系Na~+,Mg~(2+)//SO_4~(2-),B_4O_7~(2-)-H_2O 288 K时的相平衡实验中,有复盐Na2SO_4·MgSO_4·4H_2O生成,平衡相图中有3个共饱点,7条单变量曲线,5个结晶区,对应的平衡固相分别为Na2B4O7·10H_2O,MgB4O7·9H_2O,Na2SO_4·10H_2O,MgSO_4·7H_2O和Na2SO_4·MgSO_4·4H_2O.     

沙尘天气模拟系统混合段长度计算

应用气固两相流理论计算了沙尘天气模拟系统颗粒自由悬浮速度和混合段长度,利用FLUENT对该系统气固两相流场进行了数值模拟,其中连续相、颗粒相分别采用k-ε湍流模型和离散相模型,相问作用采用随机跟踪模型.结果表明,连续相流场分布规律与理论设计吻合较好,颗粒相浓度场分布可达到试验设计要求.     

Experimental Investigation of Crystal Structure of Zr0.98NiGe2.94 and Phase Equilibria in Zr-Ni-Ge System

Zr0.98NiGe2.94的晶体结构与Zr-Ni-Ge体系相平衡关系的实验研究

王正阳^1,2,曾维敬^1,2,张鸿^1,2,刘华山^1,2

（1.中南大学 材料科学与工程学院, 长沙 410083;

2.中南大学 有色金属材料科学与工程教育部重点实验室,长沙 410083）

摘要：

本文采用粉末X射线衍射法和平衡合金取样法测定了化合物Zr0.98NiGe2.94的晶体结构以及Zr-Ni-Ge三元体系在973和1173 K下的相平衡关系。根据结构精修的结果,确定了化合物Zr0.98NiGe2.94属于正交晶系,其空间群为Pbcm (No.57)。此外,根据电子探针显微分析(EPMA)和X射线衍射(XRD)的结果,构建了Zr-Ni-Ge三元体系在973和1173 K的等温截面。在该体系中,除了已知化合物τ1(Zr6Ni16Ge7)、τ2(Zr0.98NiGe2.94)、τ3(Zr3Ni4Ge4)、τ4(ZrNiGe)和τ5(Zr2Ni0.54Ge0.46)外,首次发现了一个新的三元化合物τ6,其成分组成接近Zr39Ni18Ge43。同时确定了一个零变量反应Ni5Ge3+τ4↔τ1+τ3,反应温度在973 K ~ 1173 K之间。

关键词：Zr-Ni-Ge体系; 相图; 等温截面; 晶体结构; Zr0.98NiGe2.94

     

烧结机布料及机尾断面自动监测图象专家分析系统

研制了马钢第二烧结厂烧结机布料及机尾断面自动监测图象专家分析系统,简要介绍了该系统的应用及硬件和软件主要基本结构及设计方案.     

25℃K2SO4-(NH4)2SO4-H2O体系相平衡的研究

用等温法测定了25℃K2sO4-(NH4)2SO4-H2O四元体系相平衡的数据,并依据湿渣法与X射线衍射相结合的方法对平衡固相组成进行了鉴定,发现该三元体系相图存在5个结晶区,分别是硫酸钾、硫酸铵、和硫酸钾与硫酸铵固溶体3个纯固相的结晶区,硫酸钾和硫酸钾与硫酸铵固溶体两个固相共饱结晶区,及硫酸铵和硫酸钾与硫酸铵固溶体两个固相共饱结晶区.     

Universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong electrolyte aqueous solution and its application in the NaCl-KCI-H2O system

A universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong elec-trolyte aqueous solution has been developed based on the ion and molecule coexistence theory, and verified in the NaCl-KCl-H2Oternary system at 298.15 K, To compare the difference of the thermodynamic model in binary and ternary strong electrolyte aqueous solutions, the mass action concentrations of components in the NaCI-H20 binary strong electrolyte aqueous solution were also com-puted at 298.15K. A transformation coefficient was required to compare the calculated mass action concentration and reported activ-ity because they were obtained at different standard states and concentration units. The results show that the transformation coeffi-cients between calculated mass action concentrations and reported activities of the same components change in a very narrow range.The calculated mass action concentrations of components in the NaCl-H2O and NaCl-KCl-H2O systems are in good agreement with the reported activities. This indicates that the developed thermodynamic model can reflect the structural characteristics of solutions,and the mass action concentration also strictly follows the mass action law.     

Universal thermodynamic model of calculating the mass action concentrations of omponents in a ternary strong electrolyte aqueous solution and its application in the NaCl-KCl-H_2O system

A universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong elec-trolyte aqueous solution has been developed based on the ion and molecule coexistence theory,and verified in the NaCl-KCl-H2O ternary system at 298.15 K. To compare the difference of the thermodynamic model in binary and ternary strong electrolyte aqueous solutions,the mass action concentrations of components in the NaCl-H2O binary strong electrolyte aqueous solution were also com-puted at 29...     

[Bmim]Br-AlCl3-苯-n-十二烷基苯-CO2四元体系相平衡测定

以静态分析方法,在温度为40,60℃及压力为0~10.5MPa范围内,测定了CO2-苯-1-十二烷基苯-[Bmim]Br-AlCl3的相平衡数据,比较了[Bmim]Br-AlCl3、苯、1-十二烷基苯的分配因数(各组分在富离子液体相中的质量分数与富十二烷基相中的质量分数比值)随压力变化的规律.结果表明:加入可CO2促进苯、1-十二烷基苯在离子液体中的溶解;在40℃、8.0MPa及60℃、8.0~10.5MPa条件下,苯、n-十二烷基苯、[Bmim]Br-AlCl3的分配因数接近1.0;富离子液体相及富n-十二烷基相的互溶性最强,两相转变为均一相.加入CO2有利于将异相反应转变为均相反应.     

Universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong electrolyte aqueous solution and its application in the NaCl-KCl-H2O system

A universal thermodynamic model of calculating the mass action concentrations of components in a ternary strong electrolyte aqueous solution has been developed based on the ion and molecule coexistence theory, and verified in the NaCl-KCl-H₂O ternary system at 298.15 K. To compare the difference of the thermodynamic model in binary and ternary strong electrolyte aqueous solutions, the mass action concentrations of components in the NaCl-H₂O binary strong electrolyte aqueous solution were also computed at 298.15K. A transformation coefficient was required to compare the calculated mass action concentration and reported activity because they were obtained at different standard states and concentration units. The results show that the transformation coefficients between calculated mass action concentrations and reported activities of the same components change in a very narrow range. The calculated mass action concentrations of components in the NaCl-H₂O and NaCl-KCl-H₂O systems are in good agreement with the reported activities. This indicates that the developed thermodynamic model can reflect the structural characteristics of solutions, and the mass action concentration also strictly follows the mass action law.