Solid-state phase equilibria in the Gd–Co–Al ternary system at 1173 K

A portion of the isothermal section (1173 K) of the phase diagram of the Gd–Co–Al ternary system (up to 33.3 at.% Gd) were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersion spectroscopy (EDS) techniques. Fourteen single-phase regions (including solid solution regions of the binary compounds), twenty-five two-phase regions and twelve three-phase regions were found to exist at this isothermal section. In the GdCo₂–GdAl₂ system, the existence of the GdCo_0.74Al_1.26 phase is identified and it has a composition range of 30–45 at.% Al, the maximum solid solubility of Al in GdCo₂ is about 15 at.%, and Co in GdAl₂ is about 16 at.%. Besides, the maximum solid solubility of Al in Co, Gd₂Co₁₇ and GdCo₅ is about 6, 17 and 25 at.%, respectively, the maximum solid solubility of Gd in Co, CoAl is below 2 at.% and the solid solubility range is from 47 to 61 at.% Al in CoAl phase. In this work, no new ternary compounds were observed.     

基于梯形图方法的全气动装弹机械手设计

介绍了基于梯形图设计方法的全气动装弹机械手的设计,重点探讨了在设计中考虑气缸运行位置检测、手动及自动切换、急停处理等实用问题.采用两位三通阀扩充方法来解决单一行程阀多次切换分区条件的难题,利用梭阀实现手动和自动操作的配合,通过增加一个中继阀来实现急停处理.     

Phase diagram of R-Fe-Co pseudoternary system with R≤33.3%(mole fraction,R=Sm0.5Dy0.5)

1　ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｔｗｏｓｕｃｃｅｓｓｆｕｌｆａｍｉｌｉｅｓｏｆｒａｒｅ ｅａｒｔｈｃｏｂａｌｔｐｅｒｍａｎｅｎｔｍａｇｎｅｔｓｐｒｏｄｕｃｅｄｃｏｍｍｅｒｃｉａｌｌｙａｒｅＳｍＣｏ5ａｎｄＳｍ2 Ｃｏ17.ＴｈｅＳｍＣｏ5ｍａｇｎｅｔｓｈａｖｅｂ     

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 本文提出了一种基于直接冲击电压对电器绕组匝间绝缘的试验方法。用电压波形比较法，把冲击电压经高速切换，交替施加于被测绕阻两端和参考物绕组两端，通过观察电压衰减振荡波形的变化，便可检测被测绕组的匝间是否有异常。     

THERMODYNAMICS AND PHASE EQUILIBRIUM OF Cu－Y－O，Cu－Y－S，Cu－Y－O－S LIQUID SOLUTIONS

ＴＨＥＲＭＯＤＹＮＡＭＩＣＳＡＮＤＰＨＡＳＥＥＱＵＩＬＩＢＲＩＵＭＯＦＣｕ－Ｙ－Ｏ，Ｃｕ－Ｙ－Ｓ，Ｃｕ－Ｙ－Ｏ－ＳＬＩＱＵＩＤＳＯＬＵＴＩＯＮＳ￥Ｄｕ，Ｔｉｎｇ；Ｌｉ，Ｇｕｏｄｏｎｇ（ＣｅｎｔｒａｌＩｒｏｎａｎｄＳｔｅｅｌＲｅｓｅａｒｃｈｉｎｓｔｉｔ...     

YCl_3－AECl_2（AE＝Mg，Ca，Sr，Ba）二元相图的研究

用差热分析法测定了ＹＣｌ_３一ＳｒＣｌ_２体系二元相图，并用Ｘ时线衍射法验证了该二元体系中新相的生成。使用ＣＡＬＰＨＡＤ技术评估和优化了ＹＣｌ_３一ＡＥＣｌ_２（ＡＥ＝Ｍｇ，Ｃａ，Ｓｒ，Ｂａ）系列四个二元相图和热力学性质，取得了热力学性质和相图自相一致的结果。     

模拟宫腔液中铜腐蚀行为的研究

铜在模拟宫腔液中腐蚀后，溶液分析和表面膜阴极还原都证明，以离子形态进入溶液的铜在腐蚀总量中所占的比例随溶液ｐＨ而不同。ｐＨ７时约占三分之一。当ｐＨ降低，这个比例明显增大。模拟宫腔液中溶解氧对铜腐蚀的影响，由于促进溶解和有利成膜的两个相反的作用，在某个氧分压下腐蚀速度出现极大值，ｐＨ７和ｐＨ８时分别为０．１２ａｔｍ和０．６ａｔｍ。根据铜的自然腐蚀电位随介质ｐＨ的变化，应用Ｃｕ－Ｃｌ－Ｈ２Ｏ的电位－ｐ     

SOLUBILITY CHARACTERISTICS OF GaAs IN Bi AND THEIR PHASE DIAGRAM

A modified liquid phase epitaxy apparatus for semiconductor materials was used to measurethe solubility of GaAs in Bi.Two phase diagrams rich in Bi under H_2 and N_2 atmosphereswere obtained according to the results of measurement.A new phenomenon,in which theparameter Q value(quantity of GaAs dissolved in Bi in fixed time/saturation quantitu,ofGaAs in Bi)was different from each other at various temperatures and there existed a maxi-mum Q value at definite temperature,was observed.This phenomenon may be regarded as acommon feature of a simple binary metallic system which has the phase diagram similar tothat of Bi-GaAs.The difference observed from the dependence of Q values on temperature inboth H_2 and N_2 atmospheres was discussed.     

Thermodynamic analysis and assessment of the Ce–Ni system

An optimised set of thermodynamic parameters for the Ce–Ni system has been obtained using the CALPHAD approach. A thorough thermodynamic analysis of the system has been carried out using different calorimetric techniques and the data have been used in the assessment. The free energy of the liquid phase has been described as a function of temperature and composition using a Redlich–Kister polynomial. Solid compounds have been considered as stoichiometric with the exception of the Laves phases. The phase diagram and thermodynamic quantities calculated from assessed parameters agree well with experimental data.     

Nacl—Bacl2—Srcl2三元熔盐相图的计算

本文运用作者提出的从三个对应的二元系的热力学性质预示三元溶液的热力学性质的新对称几何模型,推导得到三元溶液中三个组元的偏摩尔热力学性质的数学表达式。进而将这一结果应用于NaCl-BaCl_2-SrCl_2三元熔盐相图的计算中,得到此三元系的液相析出面及若干等温截面。计算所得结果与实测结果偏差小于5℃,说明此模型在一些熔盐体系中有较好的适用性。