镍(Ni)——金属在现代军事上的应用

<正> 1969年岁末,伦敦股票交易所发生了一场前所未有的大恐慌,事情是由镍的股票投资引起的。新闻报道说澳大利亚发现了一个大镍矿,消息传到伦敦,当即建立一个名叫波塞顿的股份公司,发行这个镍矿的股票。股票一上市,便成为交易所里最抢手的股票,价格猛涨。可是不久。有消息说该镍矿含量评估报告中小数点的位数点错了,把含镍量提高了10倍。这一下,波塞顿公司的     

镍对热镀锌耐蚀性的影响

对Q235和Q345两种材料表面热浸镀纯Zn和Zn－Ni合金，研究Ni对热镀锌耐蚀性的影响。采用中性盐雾试验对镀层耐蚀性测试，将纯Zn镀层和Zn-Ni合金镀层进行对比，并用电子天平称量试样重量变化。结果表明Zn－Ni合金镀层比纯Zn镀层更耐腐蚀。     

镀液中镍锌含量比对酸性液电镀Zn-Ni合金的影响

为了确定镀液中镍锌含量比对酸性液电镀Zn-Ni合金质量的影响.利用能谱仪、扫描电镜以及耐腐蚀实验等方法分析镀层的形貌和性能.结果表明:在镍锌含量比为0.75时镀层中镍含量为13%.效果较好:当镍锌含量比较低时很难施镀,得到的镀层形貌不好,在高于0.75时效果也不理想,在镍锌含量比为0.75时效果最好,镀层致密,颗粒细小均匀并且不易脱落;镀层有良好的耐腐蚀作用.     

高能球磨制备的纳米晶RANEY镍催化剂的结构特性

通过高能球磨制备的Ｒａｎｅｙ镍催化剂获得亚稳定态纳米晶ＮｉＡ１单相，经退火处理后获得Ｎｉ２Ａｌ３相，对催化极为有利。同时对高能球磨过程中的粒度变化及表面状态进行了探讨。高能球磨是生产高效Ｒａｎｅｙ镍催化剂的一种新的尝试。     

钛镍及其合金的激光热处理现状

本文综述了近期国内Ti－Ni及其合金的激光热处理研究现状,试验证明激光热处理可以改善Ti－Ni及其合合的耐磨性、抗蚀性、高温抗氧化性和热稳定性。     

电沉积工艺对锌镍合金镀层镍含量的影响

实验分析了锌镍合金电沉积过程中温度、导电盐、添加剂量和pH值等工艺参数对镀层镍含量的影响。着重考察了pH值与添加剂之间的相互作用及其匹配关系对镀层镍含量的影响。发现pH值在有无添加剂时对镀层镍含量的影响规律不同,并试用极化曲线分析其原因。     

Dissolution of Nickel in Copper Residue Generated from Nickel Matte Refining

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油酸对金属纳米镍、铜及铜镍复合粉体的分散性能影响

在对直流氢电弧蒸发法制备的金属纳米镍粉、铜粉及铜镍复合粉体的Zeta电位测量的基础上,采用油酸作为表面改性剂,系统研究了超声分散时间和油酸添加量对3种粉体在无水乙醇中分散性能的影响。研究结果表明,所制备金属纳米粉体表面均带有正电荷,油酸对3种粉体均具有较好的分散作用。     

Grain Boundary Diffusion of Nickel into Copper

A high resolution autoradiographic study of the diffusion of a nickel isotope (Ni⁶³) into copper in the temperature range of 650° to 925°C, with particular emphasis on grain boundary diffusion, has been made. The extent of grain boundary diffusion is a function of the grain boundary angle and the diffusion temperature. The ratios of the grain boundary diffusion coefficient to the lattice diffusion coefficient ranges from 10⁴ to 10⁵. The activation energy for grain boundary diffusion decreases with increasing grain boundary angle.     

提高杂铜中镍回收比率的研究

杂铜中多余的镍作为有害杂质在阳极炉彻底氧化造渣除去,以确保阳极铜在电解时获得满意的阴极铜;造成了大量的镍白白损失.能否将这部分镍在保证阴极铜质量的情况下合理地回收回来,成为本项目研究的焦点.     

提高杂铜中镍回收比率的研究

杂铜中多余的镍作为有害杂质在阳极炉彻底氧化造渣除去，以确保阳极铜在电解时获得满意的阴极铜；造成了大量的镍白白损失。能否将这部分镍在保证阴极铜质量的情况下合理地回收回来，成为本项目研究的焦点。     

Oxidation Potentials in Matte Smelting of Copper and Nickel

The oxidation potential, given as the base-ten logarithm of the oxygen partial pressure in bars and the temperature [log pO₂/T, °C], defines the state of oxidation of pyrometallurgical extraction and refining processes. This property varies from copper making, [?6/1150]; to lead/zinc smelting, [?10/1200]; to iron smelting, [?13/1600]. The current article extends the analysis to the smelting of copper and nickel/copper sulfide concentrates to produce mattes of the type Cu(Ni)FeS(O) and iron silicate slags, FeO_xSiO₂—with oxidation potentials of [?7.5/1250].     

Adhesion of Electroformed Copper and Nickel to Plastic Laminates

By electroforming a copper or nickel surface to give mechanical keying, its adhesion to epoxide laminates can be increased from a peel strength of 4 lb/in to 12 lb/in. By oxidation or chemical treatment of the metal surface an improvement in peel strength of about 1 lb/in is obtained.     

Oxidation Mechanisms of Copper and Nickel Coated Carbon Fibers

Differential-Thermal Analysis (DTA) and X-ray diffraction analysis were applied to determine the mechanisms of high-temperature oxidation of copper- and nickel-coated carbon fibers. Both kinds of coatings were deposited by electroless plating onto the fiber surface. The as-deposited copper film was crystalline, whereas the nickel coating consisted of an amorphous Ni–P alloy. Coated fibers were heated from room temperature to 900 °C in air at 10 °C min^?1. For the copper coating, the main oxidation product formed at low temperatures was Cu₂O, while at higher temperatures was CuO. The crystallization of Ni–P took place at 280–360 °C with the formation of Ni and Ni₃P. The final compounds were NiO, Ni₂P and Ni₃(PO₄)₂. After complete oxidation of the carbon fibers, copper and nickel-oxidized microtubes were obtained. Besides, while copper reduced the temperature of the fiber oxidation, nickel coatings increased the minimum temperature needed for this reaction.