铜包钢电话用户通信线的研制

介绍铜包钢芯线生产的设备研制和工艺研究,应用其设备和工艺能产生出合格的电话线。     

全塑市话电缆芯线挤出口模的设计与加工

<正> 在塑料应用领域中,聚烯烃挤出制品在八十年代被广泛应用。通讯市话电缆绝缘芯线由原来的绝缘纸被聚烯烃代替了。 随着全塑市话电缆的高速发展,对塑料性能的要求也越来越高,而目前应用最广泛的国产高压聚乙烯的绝缘等性能较进     

粉芯线材电弧喷涂研究和发展

国外开发的几种涂层虽具有耐磨性高、使用寿命长、性能稳定等优点,但由于喷涂材料价格昂贵、采用的设备成本高、工艺技术含量高等一系列因素,不适合我国国情,在国内得不到推广使用,粉芯线材电弧喷涂技术制备高温耐磨蚀涂层是目前材料研究热点之一,目前国内外研究机构对锅炉受热面管的涂层防护技术进行了大量实验研究和应用,并已取得了一定效果,这种方法操作简便、成本低、直接有效,可为社会创造十分可观的经济效益。     

用抗铜母粒改性电缆芯线包覆层

<正> 随着通讯事业的发展,对通讯电缆的质量要求越来越高,采用抗铜母粒可延长其使用寿命,确保通讯可靠性,还具有可观的经济效益和社会效益。     

0.36＋5×0.36ST钢丝帘线的开发

介绍0.36＋5×0.36ST钢丝帘线的结构和性能特征,并与0.365＋6×0.35HT钢丝帘线进行对比。结果表明,与0.365＋6×0.35HT钢丝帘线相比,0.36＋5×0.36ST钢丝帘线强度高、捻距大,橡胶渗透性能优异,可减少芯线刺出风险,减小轮胎质量。     

0.36+5*0.36ST钢丝帘线开发

介绍0.36+5*0.36ST钢丝帘线的结构特征和基本性能,并与0.365 6*0.35HT钢丝帘线性能 进行对比分析。与1635HT钢丝帘线对比,1536ST钢丝帘线在满足子午线轮胎强度要求的前提下,可以提 高钢丝橡胶渗透性能、减少芯线刺出风险、减小轮胎质量,提高燃油经济性。     

提高乙丙橡胶硬度对潜油电缆性能的影响

潜油电缆是连接地面与油田井下的纽带,它的性能直接影响着潜油电泵机组运行的寿命和整体效益。对比国内外潜油电缆的不同特点,找出差距,从而采取不同措施,才能不断改进和提高国内潜油电缆的质量,赶超世界先进水平。     

一种碳纤维发热线

本实用新型公开了属于技术领域内的一种碳纤维发热线,包括碳纤维芯线、碳纤维线绝缘层、金属导线,所述碳纤维线绝缘层包裹于碳纤维芯线外,碳纤维芯线的端部伸出碳纤维线绝缘层外,碳纤维芯线的端部设有由所述金属导线绕成的螺线管,金属导线的首端压在碳纤维芯线的首端与螺线管内壁之间,金属导线的尾端从螺线管的尾端伸出;所述螺线管首端的金属导线绕成一环形扣,所述环形扣呈圈状套置在碳纤维线绝缘层外。本实用新型使碳纤维芯线和金属导线之间能够良好连接,不易折断,使用可靠、寿命长。本实用新型可应用在需要将碳纤维线与金属导线相连接的场所。     

非等温包覆机头胶料流场挤出均匀性的研究

对非等温包覆机头胶料流场挤出均匀性进行研究。结果表明：非等温包覆机头胶料流场压力、温度和流动速度的模拟变化趋势与实际相似,模拟试验是分析包覆机头胶料流场的一种有效方法;确定了影响胶料包覆均匀性的包覆机头流道参数（进料口位置、进料口直径和芯线牵引速度）的相关变化规律,为包覆工艺及包覆机头流道参数的合理选择提供了理论依据;确定了包覆过程中芯线牵引速度与进料口胶料流量匹配性的评价方法。该研究为包覆工艺及包覆机头流道参数的确定提供了理论指导。     

废杂铜的回收与利用

介绍了我禺铜的需求及资源状况,提出了我国废杂铜回收利用的必要性。总结了国惠废杂铜的分类方法和废杂铜回收利用的现状以及废杂铜的回收处理方法,并针对国内废杂铜的回收利用情况提出了意见与建议,希望能够为我国废杂铜的回收利用提供参考。     

Copper removal during formation of corrosion resistant alkaline oxide coatings on Al–Cu–Mg alloys

The performance of corrosion resistant inorganic oxide coatings formed on Al–Cu–Mg alloys is often degraded by Cu enrichment that occurs during oxide formation. This is particularly true of coating processes conducted in basic solutions. A modification to an alkaline oxide coating process has been made that simultaneously eliminates Cu enrichment and forms a corrosion resistant coating. In this paper, the modified process is described and the resulting coating morphology, structure and composition are reported. Results from electrochemical and exposure corrosion tests show that useful gains in corrosion resistance are achieved. Cu removal during the modified process is rationalized using an argument based on the increase in Cu solubility that occurs in solutions with a pHgreater than the solubility minimum for Cu (9.8), and the effect of Cu complexing by carbonate.     

熔融铜渣回收铜及铜铁合金工艺研究

本文根据某炼铜熔融炉渣的矿物特性和选矿工艺特点,提出了一种"两步法"新工艺分别回收铜和铜铁合金,即低温阶段回收铜,高温阶段回收铜铁合金。该工艺对铜和铜铁合金提取比较充分,回收率均在90%以上。回收铜的品位可达99%,可直接送去火法精炼;产出的铜铁合金有害杂质少,可作为耐候钢的理想原料,其价值比纯铁高。此工艺用粉状或粒状非焦煤代替焦炭作还原剂,不用烧结,可以充分利用铜厂现有的设备,节省投资成本。该工艺简单易行,操作方便,有效实现了铜渣的资源化利用,具有良好的经济、社会和环境效益,是一种应用前景广阔的铜渣再利用工艺。     

Copper nucleation on titanium for thin film applications

Copper nucleation and growth on titanium substrates from concentrated acidic copper sulfate solutions was studied at 45 and 65C and high cathodic potentials. Electrochemical experiments allied to SEM examination were performed to characterize the mechanism of nucleation and its evolution with time. Particular emphasis was given to the influence of potential and agitation on the initial stages of nucleation and growth. Results indicated that most of copper nucleation on titanium from a 83g dm^–3 Cu²⁺ solution, at 65 C, is achieved in a matter of milliseconds. As expected, the initial stages of the copper nucleation and growth is strongly dependent of potential and temperature, and the influence of agitation is only evident at very high potentials. The calculated diffusion coefficients for Cu²⁺ at 45 and 65 C, under the experimental conditions, were found to be 9.16 × 10^–6 and 1.62 × 10^–5cm² s^–1, respectively.     

An Analysis of Contemporary Copper Recycling in China

Copper consumption increased very quickly in China in recent years, which could not be met by inland copper industry. In order to achieve a sustainable development of copper industry, an analysis of copper recycling in China was necessary. For the life cycle of copper products a copper-flow diagram with time factor was worked out and the contemporary copper recycling in China was analyzed, from which the following data were obtained. The average life cycle of copper products was 30 years. From 1998 to 2002, the use ratio of copper scraps in copper production, the use ratio of copper scraps in copper manufacture, the materials self-support ratio in copper production, and the materials self-support ratio in copper manufacture were 26.50%, 15.49%, 48.05% and 59.41%, respectively. The materials self-support ratios in copper production and manufacture declined year by year in recent years on the whole, and the latter dropped more quickly. The average index of copper ore and copper scrap from 1998 to 2002 were 0.8475 t/t and 0.0736 t/t, respectively; and copper resource efficiency was 1.1855 t/t. Some efforts should be paid to reduce copper ores consumption and promote copper scraps regeneration. Copper scraps were mostly imported from foreign countries because of shortage in recent years in China. Here the reasons related to copper scraps deficiency were also demonstrated. But we can forecast: when copper production was in a slow rise or in a steady state in China, the deficiency of copper scraps may be mitigated; when copper production was in a steady state for a very long time, copper scraps may become relatively abundant. According to the status of copper industry in China, the raw materials of copper production and manufacture have to depend on oversea markets heavily in recent years, and at the same time, the copper scraps using proportion and efficiency in copper industry should be improved.     

Comments on “The effect of ZnO in methanol synthesis catalysts on Cu dispersion and the specific activity” [by T. Fujitani and J. Nakamura]

Fujitani and Nakamura recently reported on the effect of ZnO on Cu/ZnO methanol synthesis catalysts (Catal. Lett. 56 (1998) 119). Having measured the methanol synthesis activity of a series of Cu/ZnO catalysts of different Cu/ZnO ratios, they reported a linear relationship between the copper metal area and the methanol yield (implying a fixed value of the copper specific activity) and paradoxically they also reported a volcano-type relationship between the copper specific activity in methanol synthesis and the ZnO content. This paradox is resolved by showing that their Cu/ZnO catalysts fall into two groups: (i) the low-surface-area copper catalysts which have a specific activity of 10 mg CH₃OH/m²-Cu h and (ii) the high-surface-area copper catalysts which have specific activity of 14.8 mg CH₃OH/m²-Cu h. These different specific activities derive from different surface morphologies of the copper in these catalysts. This revised version was published online in November 2006 with corrections to the Cover Date.     

液相空气氧化法制取硫酸铜工艺的研究

对液相空气氧化法制取硫酸铜的生产条件进行了研究。在实验基础上，提出了中酸度高温空气氧化法生产硫酸铜的新工艺。     

Electrochemical investigations of copper behaviour in different cupric complex solutions: Voltammetric study

The electrochemical behaviour of copper has been investigated in different cupric complex solutions by cyclic voltammetry. In pyridinic and picolinic solutions the reduction of cupric complex occurred in two stages leading to Cu(I) and Cu(0), respectively. The electrodeposited copper is oxidized in two steps leading to Cu(I) and Cu(II) as in ammoniacal cupric complex solutions. In glycine, alanine, sulfamic acid and ethylenediamine solutions, the cuprous complex is an intermediate in the cupric complex reduction but it is not detected during the oxidation of the electrodeposited copper in these solutions. In EDTA and triethanolamine solutions, the cuprous complex is not observed. The rate of copper etching was determined in pyridinic and ammoniacal cupric solutions and was shown to be faster in ammoniacal cupric solutions than in the pyridinic solutions.     

铜及铜合金钝化常见故障及控制措施

对铜及铜合金钝化制件的常见故障进行了总结,列出了制件原始状态差、操作不认真、后期保管不良3个方面的原因,制定了相应的控制措施.