Mechanism for the Peritectic Reaction and Growth of Aligned Grains in YBa2Cu3O6+x

It is experimentally observed that the peritectic reaction, 211 + liquid → 123, can be driven essentially to completion in 1 h at an undercooling of only ∽30°C. The kinetic data, together with the observed microstructures, are inconsistent with the normal mechanism of the peritectic reaction. It is proposed that the mechanism of the reaction involves dissolution of 211 particles into the liquid and precipitation of solid 123. The aligned grain structure is explained through sympathetic nucleation of new 123 grains on existing grains.     

乙醇电氧化的研究进展

简要地叙述了国内外乙醇电催化氧化的研究进展，着重介绍不同电极材料对乙醇电氧化的影响及目前所提山的机理，并对其可能的研究方向提出了建议。     

超高纯铜的制备方法和应用

简要介绍了超高纯铜(UHPC)的几种精炼方法，以及它在工业方面的应用。并对超高纯铜的研究开发趋势及应用前景进行了展望。     

Proton and hydrogen formation by cyclohexyl benzene during overcharge of Li-ion batteries

This study provides experimental evidence for proton and hydrogen formation caused by the anodic electropolymerization of cyclohexyl benzene (CHB), which is a popular electrolyte additive for overcharge protection of lithium-ion batteries (LIBs). It is found that considerable H₂ evolution is observed in overcharged LiCoO₂/graphite cells, especially when CHB is included as an electrolyte additive. In order to confirm the proton generation during the CHB oxidation, Pt/Pt-rotating ring disc electrode (RRDE) measurements are performed in 1 M Li(C₂F₅SO₂)₂N ethylene carbonate/ethyl methyl carbonate (1/2, v/v) solutions with and without CHB. The cathodic ring current is intimately correlated to the anodic disc current, and the cathodic reaction at the ring is determined to be the reduction of the proton. The proton generation efficiency during the CHB oxidation is as high as 90%. Proton liberation is also observed during the anodic decomposition of the electrolyte solvents, although it occurs in a much less stoichiometric way compared with that during the CHB oxidation.     

黄埔发电厂#6发电机转冷水系统改造

黄埔发电厂#6发电机转冷水铜离子含量超标，通过对缺陷原因进行分析，针对二级水封的特性对溢出的转冷水进行回收并利用化学凝结水处理去除溶出的铜离子，通过控制转冷水的pH值最终减缓铜管的腐蚀.     

用于铜的化学机械抛光液的研究

文中介绍了一种以碱性抛光液对铜进行全局平面化的方法 ,讨论了以 Si O2 水溶胶为磨料的抛光液在Cu-CMP过程中的化学 (络合 )作用及反应机理 ,并给出了抛光液的配比及上机实验结果。结果表明 :该抛光液用于对带有阻挡层和介质层的铜抛光 ,达到了对铜层的高去除速率和高选择比 ,取得了较好的全局平面化效果     

APDT-00三极放电管全自动打印机的研制

介绍了新近研制的APTD - 0 0三极放电管全自动打印机的结构特点及整机设计的关键技术 ,阐述了自动上料机构、打印机构和控制电路的设计     

Change in Availability of Mineral and Raw Material Resources as a Result of Scientific and Technical Progress

The tendencies characterizing worsening of natural, mining and technical, as well as mining and geological conditions of deposit mining are analyzed for the last 100 years. The change in prices for mineral raw material is shown, and the influence exerted by scientific and technical progress in the sphere of mining and processing of copper-containing ores is established. An approach to the estimate of available mineral reserves and possibility of their involvement in mining is stated.     

Some aspects of the electrochemistry of the flotation of pyrrhotite

The iron sulfide mineral, pyrrhotite (Fe_(1–x)S), has long been known to be more difficult to recover by flotation from alkaline slurries than many other base metal sulfide minerals. This paper summarizes the results of an electrochemical study of the surface reactions that occur during the flotation of nickeliferous pyrrhotite in the recovery of nickel and the platinum group metals. Mixed potential measurements conducted with natural pyrrhotite electrodes in various stages of an operating flotation plant showed that the mineral potential is positive to the equilibrium potential of the xanthate/dixanthogen couple. Similar results were obtained during batch flotation experiments and in synthetic solutions in the laboratory. Cyclic voltammetric and potentiostatic current/time transient experiments were used to investigate the oxidation of pyrrhotite under various conditions. In addition, the reduction of oxygen, the reaction of copper ions and the oxidation of xanthate ions at the mineral surface were investigated. The formation of dixanthogen on pyrrhotite surfaces is thermodynamically favourable in plant flotation slurries. However the interaction with xanthate at pH values above 7 is inhibited by a surface species formed during the conditioning prior to xanthate addition. In acidic solutions copper ions react readily with pyrrhotite to form a species, possibly CuS that can be oxidized at potentials above 0.4 V. At pH 9 this species does not form and there is no electrochemical reaction between pyrrhotite and copper ions. The beneficial effects of copper ions to flotation performance appear to be related to an enhancement of the oxidation of xanthate.     

氨荒酸盐抑制铜在NaCl溶液中腐蚀的电化学研究

通过电化学极化曲线和失重实验,研究了氨荒酸盐对铜在氯化钠溶液中的缓蚀性能,并与相应胺的缓蚀性能进行了对比。结果表明:氨荒酸盐对铜具有较好的缓蚀性能。