低频脉冲电流退火对CoFeSiB非晶薄带巨磁阻抗效应的影响

研究了经不同低频脉冲电流密度退火的Co66.3Fe3．7Si12B18非晶薄带的巨磁阻抗（GMI）效应。结果表明，在低频脉冲电流下，巨磁阻抗效应的大小与退火电流密度密切相关。非晶带的GMI变化率△Z／Z先随退火电流密度的增加而增强，当电流密度为104A／mm^2时，△Z／Z达到最大值53．8％，此后随电流密度增大，GMI变化率开始减小。对脉冲电流退火影响巨磁阻抗效应的机制作了定性分析。并分析了由脉冲电流退火在材料内感生的横向各向异性场凤对GMI效应的影响，发现HK有利于提高GMI效应的峰值，但同时存在一个临界值，当超过这个值时，GMI效应的峰值减弱。     

数控机床远程故障诊断技术研究

本文介绍了数控机床远程故障诊断系统的结构与功能,论述了系统的构成、实现方法以及所涉及的主要技术。     

焊接材料在空调行业的应用

针对目前空调行业冷凝器和蒸发器的材料使用以及其焊接现状入手,在降低成本、保证质量的前提下,提出对冷凝器和蒸发器材料的改换以及可行性的焊接方法,尤其对扩散焊接方法进行详细的论述.     

Poly(N-methylaniline) coatings on stainless steel by electropolymerization

Poly(N-methylaniline) (PNMA) coatings have been electropolymerized on 304 stainless steel alloy by potentiodynamic, galvanostatic and potentiostatic synthesis techniques from aqueous solutions of 0.1 M N-methylaniline (NMA) and 0.3 M oxalic acid. Characterization of PNMA coatings was carried out by cyclic voltammetry, UV-Vis and FTIR spectroscopy techniques. Corrosion behavior of PNMA coated stainless steel electrodes was investigated using linear anodic potentiodynamic polarization, Tafel test, chronoamperometry and electrochemical impedance spectroscopy (EIS) techniques in 0.5 M aqueous HCl solutions. Corrosion test results showed that PNMA coatings possessed protection to uncoated stainless steel against corrosion.     

电流密度对铝合金微等离子体氧化陶瓷膜抗热震性能的影响

用微等离子体氧化方法在LY12铝合金表面制备了一层氧化陶瓷膜，然后用加热一淬冷的方法进行抗热震试验，研究了电流密度对陶瓷膜抗热震性能的影响，并结合SEM、XRD等手段对试验现象和膜层的结合强度进行了分析。结果表明：随着电流密度的增加，陶瓷膜的抗热震性能降低。     

Operation optimization of concentrate burner in copper flash smelting furnace

The software that simulates the flow, temperature, concentration and the heat generation field in the Outkumpu flash smelting furnace, was developed by a numerical method of the particle-gas flow together with some chemical reaction models. Many typical operating conditions were chosen for simulation in order to obtain the effect of the distribution air, process air, central oxygen and the oil-burner position etc. The concepts about optimum op-eration, 3C(concentration of high temperature, high oxygen and laden concentrate particles), are concluded from these simulated results, which have been checked primarily by operational experiments.     

Copper hydrometallurgy-current status,preliminary economics,future direction and positioning versus smelting

The heap leaching of oxide copper ores with copper cathode recovery by solvent extraction and electrowinning is now well established as a low-cost method of copper recovery. This technology has recently been applied successfully to mixed oxide and chalcocite ores, notably in Chile at Cerro Colorado, Quebrada Blanca and Zaldivar.Currently, there are significant development efforts underway to try to extend heap leaching to chalcopyrite ores.The success of heap leaching/SX/EW has also led to a revival in the development of hydrometallurgical processes to recover copper from chalcopyrite and other copper concentrates. The current status of copper hydrometallurgy is reviewed and the most commercially attractive potential applications are explored. The advantages and disadvantages of the hydrometallurgical treatment of chalcopyrite concentrates and its preliminary economics are compared with those for the current best practices in copper smelting and refining.     

The Al–R–Mg (R=Gd, Dy, Ho) systems. Part I: experimental investigation

Key experiments were carried out on the three Al–R–Mg (R=Gd,Dy,Ho) systems and the results obtained used for the thermodynamic optimisation reported in a separate paper in this issue [Caccasmani G, De Negri S, Saccone A, Ferro R. Intermetallics this issue.]. The samples were characterized by differential thermal analysis (DTA), X-ray powder diffraction (XRD), light optical microscopy (LOM), scanning electron microscopy (SEM) and quantitative electron probe microanalysis (EPMA). The isothermal sections at 400 °C are all characterized by extended homogeneity regions at a constant rare earth content. The extension of the (Mg,Al)R solid solution, cP2-CsCl type, varies with the R atomic number. Ternary compounds (τ) of Al₂(R,Mg) stoichiometry (hexagonal Laves phases with MgNi₂-type structure) have been found to exist at 400 °C in all the systems. Their temperatures of formation were detected by DTA measurements.     

Ageing characteristics and microstructure of Al-4Mg-1.5Cu alloys containing silver and lithium

1　INTRODUCTIONTheroleoftraceelementsonageingofAlalloyshasbeenextensivelystudiedandhasbeenrecentlyre viewedbyPolmear ,RingerandPrabhuetal[14 ] .Itwasfoundthatthesmalladditionofsilvercanstimu lateenhancedagehardeningincertainAl Cu Mgal loys,andthiseffectisevidentforawiderangeofcompositionsselectedinthe (α +θ) ,(α +S)and (α+S +T ) phasefieldsoftheternary phasedia gram[57] .TheadditionofAgtoAl Cu MgalloyswithhighCutoMgratiosstimulatestheformationofanhexagonal shaped precipitate pha…     

萃取技术处理低品位铜矿的设计实践

介绍了溶剂萃取技术在铜冶金中的应用,依据半工业实验报告,设计并提供了处理低品位铜矿的萃取流程及工艺参数控制,并确定了其设备的大小。