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QIAO Zhiyu CAO Zhanmin Tanaka Toshihiro 《稀有金属(英文版)》2006,25(5):512-528
In this article, following a brief introduction concerning experimental measurements of surface and interfacial tensions, methods for calculating surface tension and surface segregation for binary, ternary, and multicomponent high-temperature melts based on Bulter's original treatment [ 1] and on available physical properties and thermodynamic data, especially excess Gibbs free energies of bulk phase and surface phase versus temperature obtained from thermodynamic databases using the calculation of phase diagram (CALPHAD) approach, with special attention to the model parameter β, have been described. In addition, the geometric models can be extended to predict surface tensions of multicom- ponent systems from those of sub-binary systems. For illustration, some calculated examples, including Pb-free soldering systems and phase-diagram evaluation of binary alloys in nanoparticle systems are given. On the basis of surface tensions of high-temperature melts, interracial tensions between liquid alloy and molten slag as well as molten slag and molten matter can be calculated using the Girifalco-Good equation [2]. Modifications are suggested in the Nishizawa's model [3] for estimation of interracial tension in liquid metal (A)/ceramics (MX) systems so that the calculations can be carried out based on the sublattice model and thermodynamic data, without deliberately differentiating the phase of MX at high temperature. Finally, the derivation of an approximate expression for predicting interfacial tension between the high-temperature multicomponent melts, employing Becker's model [4] in conjunction with Bulter's equation and inteffacial tension data of the simple systems is described, and some examples concerning pyrometallurgical systems are given for better understanding. 相似文献
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冷轧连退线张力控制模型优化策略 总被引:1,自引:0,他引:1
针对某钢厂冷轧连退机组生产钢卷规格变化时张力波动问题,提出了张力数学模型及优化算法,将前后带钢张力波动降到最低,保证了生产连续稳定进行。 相似文献
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对超低碳钢进行了标准单向拉伸和宽板单向拉伸预应变方式下的烘烤硬化处理,测试了不同预应变方式下的烘烤硬化(BH)值,用透射电镜分析了不同预应变试样内的位错密度,用Ansys软件模拟了不同预应变试样内的应变分布。结果表明,标准单向拉伸时,BH值随着预应变量的增加,先增加到最大值后又呈现下降的趋势;而宽板拉伸时,BH值随着预应变量的增加变化不大;在预应变量相同时,标准单向拉伸试样内的位错密度明显大于宽板拉伸时的位错密度;标准单向拉伸试样标距内的应变均匀且与实际外加应变相差较小,而宽板试样标距内的应变不均匀且与实际相差很大。 相似文献
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连续拉伸弯曲矫直机是近年来发展和应用的一种先进矫直设备。分析了某厂连续式拉伸弯曲矫直机延伸率达不到设计要求(30%)的原因。增加最大设计张力和无级变速箱传递的扭矩可解决这一问题。 相似文献
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倾斜式可调电极丝恒张力机构的研究 总被引:1,自引:0,他引:1
分析了高速走丝线切割机加工过程中电极丝张力对加工精度的影响,在此基础上开发了一种倾斜式可调恒张力机构,可直接恒定加工时的电极丝张力,减少电极丝的振动,提高加工质量,为实现多次切割创造了条件。 相似文献
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