镍基合金的提纯工艺

采用膜电解和化学净化方法分离镍基合金中的杂质元素,提纯金属镍。实验分别研究了除铁、铜、钴工艺条件以及电流密度、电解温度对膜电解过程的影响。     

镍基合金渗铝机理的探讨

以Ni基合金为例，探讨了金属渗铝的形成机制，认为渗铝过程由四个步骤组成，主要受固态扩散控制，影响扩散速度的决定因素是渗铝温度，其次是渗铝时间，另外，渗铝温度的变化对不同活化能的相生成速度也不同。     

铸造镍基合金热处理工艺对组织与性能的影响

本文采用了金相显微镜、Ｘ－射线衍射、电子探针和透射电子显微镜相结合的方法，研究了热处理工艺对铸造镍基合金组织的形态、成分、结构及机械性能与切削加工性能的影响。研究结果表明，该合金在９５０～１１５０℃范围内，有Ｐ相、μ相、Ｍ６Ｃ及少量σ相析出，经１２５０℃×１ｈ固溶处理后，具有最佳的综合机械性能和满意的切削加工性能。     

镍基合金管加工破裂分析研究

镍基合金管加工破裂分析研究王志英（北京有色金属研究总院１０００８８）Ｎｉ－Ｍｏ－Ｃｒ－Ｆｅ－Ｗ合金是一种具有特殊性能和用途的合金，产品成本昂贵，提高成品率是非常重要的，但在研制中常出现旋裂现象，从而影响产品的质量和成品率。查明旋裂的原因是改进工艺，提...     

电沉积镍基合金的研究进展

从电沉积的工艺条件、电沉积机理以及电沉积层的性能和应用等几个方面，概述了ＮｉＣｏ、ＮｉＦｅ、ＮｉＭｏ、ＮｉＰ等四种常见电沉积镍基合金的研究与开发现状。     

从各种含镍原料中提取电解镍

本文讨论了从各种含镍矿物原料和废料中生产电解镍的主要工艺过程，并简要介绍了某些工艺进展和电解提镍的新方法。     

G3镍基合金钝化膜的耐蚀性研究

利用极化曲线和电容测量法(Mott-Schottky曲线),研究了G3镍基合金油管材料在室温空气中以及130℃和205℃同时含H2S和Cl-的腐蚀介质中浸泡720 h所形成的3种钝化膜的电化学行为和半导体性质.结果表明:在室温空气中和130℃腐蚀介质中形成的钝化膜都具有良好的耐蚀性,而在205℃腐蚀介质中形成的钝化膜耐蚀性下降;前者具有双极性n-p型半导体特征,而后者为n型半导体,且由于掺杂浓度增加,耐蚀性能下降.     

Stability of single crystal sapphire in nickel and nickel-alloy matrices

The object of this investigation was to study the chemical interaction between single-crystal sapphire filaments and nickel and nickel alloy matrices, and to determine the effect of these reactions on filament strength. It was found that the reaction between pure nickel and sapphire in an inert atmosphere resulted in pitting of the sapphire during heat treatment, and in the formation of nickel spinel in an oxidizing atmosphere. The presence of 18 pct Cr in the nickel markedly decreased the severity of attack in both atmospheres, and in an oxidizing atmosphere a reaction product of NiO and NiAl₂O₄ was formed at the sapphire Jmetal interface. For the case of a Udimet-700 matrix, all pressing conditions resulted in severe rod fragmentation.     

Influence of the composition of high-temperature nickel-alloy electrodes on the ingot composition in vacuum arc remelting

Statistical analysis of the chemical composition of high-temperature VZh159 nickel alloy in vacuum-induction melting and vacuum arc remelting yields regression equations that may be used to predict the metal composition in the ingots obtained by vacuum arc remelting as a function of the components in the consumable electrodes. The variation in oxygen, carbon, nitrogen, sulfur, and phosphorus concentrations in remelting is determined. The results are used in the design of production processes for high-temperature nickel-alloy ingots at PAO Ruspolimet.     

Purification of gadolinium by electrorefining

The electropurification of crude gadolinium, as an alternate method to the distillation process currently used, was studied using a LiCl−LiF−GdF₃ electrolyte. The best results were obtained with a 77.6 wt pct LiCl, 11.2 wt pct LiF, 11.2 wt pct GdF₃ electrolyte at 700°C. It was shown that the purity of the deposit was strongly dependent on the purity of the electrolyte and the temperature. The purest deposit of Gd was obtained when the LiCl and LiF were purified by distillation and high purity GdF₃ was used. The analyses LiCl and LiF were purified by distillation and high purity GdF₃ was used. The analyses showed this purest gadolinium is still less pure than the gadolinium prepared by the distillation process. The effect of various methods used to remove the adhering electrolyte salts and to consolidate the deposited dendrites was studied. Removal of the adhering salts by distillation followed by arc and electron beam melting of the dendrites gave the purest Gd. The analyses of the metal prepared under the various conditions are given. HIROSHI NAGAI, formerly a Post-Doctoral Associate, Ames Laboratory-DOE. Iowa State University, Ames IA 50011.     

硫酸镍电解液净化除杂工艺研究

对硫酸镍电解液的萃取净化除杂进行了系统的研究。实验采用M5640对铜离子进行除杂,实验条件为:pH值为3.0,相比为1∶1,萃取剂体积浓度为15%,振荡时间5min,在此实验条件下铜离子的萃取率大于99.83%,其含量小于0.1mg·mL-1,已达到5N镍电解液标准。去除铜离子之后,采用P507对电解液进行除杂,在实验条件pH为4.0,相比为1∶1,萃取剂体积浓度为15%,振荡时间5min下,二价铁离子、锌离子、铅离子的萃取率分别为:99.93%,99.75%,84.01%,其含量分别为:0.10,0.21,0.30mg·mL-1,已达到5N镍电解液标准。在此之后再采用P507对电解液中钴离子进行去除,实验条件为:用氢氧化钠溶液均相制皂75%,提高待萃液当中钴离子的含量至4.19g.L-1,即Co/Ni为1/10。实验采取四级萃取,控制水相pH值在4～5之间。钴离子萃取率为74.92%,含量为14.88mg·mL-1,已达到5N镍电解液标准。