用电解铝液生产电工圆铝杆应注意的关键问题

根据电解铝液的特性及电工圆铝杆的质量要求,就利用电解铝液生产电工圆铝杆的工艺及产品性能控制方法进行了阐述。     

行业动态

南平铝业成功开发A8高强度电工圆铝杆本刊讯为了满足客户对电工圆铝杆强度越来越高的要求,南平铝业电解分厂铸造部依托多年电工圆铝杆生产的丰富经验,经过工艺参数合理调整,在连铸     

提高电工圆铝杆质量的途径

电工圆铝杆是生产铝导线的主要原材料,电工圆铝杆的质量直接影响铝导线的质量,提高电工圆铝杆的质量对节约能源,降低费用有着重要的意义。     

高导电率Al-RE-B电工圆铝杆工艺研究

对高导电率Al-RE-B电工圆铝杆生产工艺进行了系统研究,分析了RE、B合金元素、连铸连轧工艺对电工圆铝杆组织和性能的影响。     

w(Fe)/w(Si)值对电工圆铝杆电性能影响的研究

原铝杂质含量是决定电工圆铝杆电性能的关键因素。本文通过对六种不同方案生产的电工圆铝杆质量跟踪分析，得出了满足电工圆铝杆电性能要求的w(Fe)／w(Si)值。     

电工用铝硼化处理的工艺实践

原铝中的杂质元素Cr、Mn、V和Ti是影响电工圆铝杆电阻率的主要因素。在生产实践中,我们可以通过对电工用铝进行硼化处理来去除Cr、Mn、V和Ti,达到降低电工圆铝杆电阻率的目的。本文介绍在生产当中最常用的两种硼化处理方法:氟硼酸钾硼化处理法和铝硼中间合金硼化处理法,并对这两种方法进行了对比,指出应依据技术可行、经济合理的原则,选择合适的硼化方法和工艺参数。     

影响电工圆铝杆电性能的原因及解决措施

通过大量工艺探索，分析了电工圆铝杆电阻率超标的原因，并提出合理的硼化工艺，有效解决了电阻率超标问题。     

改善电工圆铝杆性能的熔体处理试验

探讨铝熔体处理对改善电工圆铝杆性能的作用。试验表明，采用高效排杂熔剂净化处理可明显提高电工圆铝杆的冶金质量，除杂率及气孔降低率分别提高22．3％和74．7％左右，削弱了冶金缺陷的有害作用；在此基础上对铝熔体进行晶粒细化及稀土变质处理，可有效提高电工圆铝杆的综合性能，满足高强电工圆铝杆的性能要求。     

L6—9.5mm电工圆铝杆工艺探讨

介绍L6-9.5mm电工圆铝杆的试制过程,探索出一套适合L6电工圆铝杆的生产工艺。     

电工圆铝杆生产工艺研究

根据电解铝液的固有特点，简要地从化学成份确定、铝液精炼、连铸连轧工艺参数的优选等方面进行分析，对电工圆铝杆分等级生产等方面有一定指导意义。     

人工时效前停放时间对7055铝合金挤压管显微组织与性能的影响

采用维氏硬度试验,室温拉伸试验,电导率测试,慢应变拉伸试验和透射电镜等方法,对人工时效前室温停放不同时间的7055铝合金管材的力学性能、电导率、耐应力腐蚀性能和微观组织进行了研究.结果表明:在人工时效前进行室温停放,7055铝合金的晶内会预先析出GP区,为后续人工时效中的η相和η'相的析出提供形核的核心,从而有效地提高合金的力学性能和电导率.人工时效前室温停放6.5 h,7055铝合金的抗拉强度达到最大值即677.9 MPa,电导率和延伸率分别为29.8 % IACS和14.9 %.继续延长室温停放时间,合金的抗拉强度降低,电导率不断增大.在室温停放48 h时,合金的抗拉强度达到649.7 MPa,延伸率为10.6 %,电导率为36.8 % IACS,此时合金的综合性能达到较优.      

无取向电工钢中酸溶铝含量对夹杂物的影响

 为提高无取向电工钢成品性能及优化生产,采用SEM-EDS等分析方法分别对比分析了无取向电工钢生产时,不同酸溶铝含量的生产工艺对钢中夹杂物的影响。研究表明,当钢中酸溶铝含量w(Als)为0.2%～0.4%时,精炼过程所生成的夹杂物为高熔点的Al2O3和球状的MgO-Al2O3类夹杂物;当钢中w(Als)小于0.005%时,精炼过程所生成的夹杂物主要为塑性硅铝锰酸盐类夹杂;各工位夹杂物平均数量呈递减的趋势,且w(Als)为02%～0.4%的高碱度渣系控制生成的夹杂物总量低于后者。     

铝电解中诸类导体的导电机理

在铝电解槽中存在着几类导体，它们的导电机理各不相同。电子是由阴极导入，经过电解质，最终由阳极导出，同时分别发生阳极反应和阴极反应，产生阳极产物CO2(气体)和阴极产品AL(液体)。新开发的惰性电极材料多数可能是电子导体。因为导电机理与铝电解节能有直接关系，所以值得研究。     

优化生产工艺 实现电解铝节能

电解铝综合电耗是电解生产中一个重要指标，其中铝成本的45％－50％，本文从改变传统的工艺操作，开展“三低一高”的技术创新和手，大幅度的提高了电流效率，降低了电解铝综合电耗，取得了较好的经济效益。     

DISPERSION-STRENGTHENED ALUMINIUM POWDER PRODUCTS FOR NUCLEAR APPLICATION

Abstract

The main properties of sintered aluminium products (SAP) of interest when consideringtheir application in nuclear technology are strength, elongation, corrosion-resistance, homogeneity, purity, compatibility with fuel, and resistance to irradiation damage. These properties are discussed briefly in connection with commercial products.

Sintered aluminium products consist of oxide particles finely dispersed in aluminium, normally subdivided into grains. The effect on tensile and creep properties of parameters such as size and volume fraction of the oxide particles and the grain size of the aluminium, is considered in relation to both commercial and experimental materials. Examination of low-oxide material in the as-extruded and in the recrystallized state shows that the oxide particles are mainly responsible for the high strength and low elongation found in sintered aluminium products at elevated temperatures. The matrix grain size contributes to the tensile strength, in reasonable agreement with the behaviour found in pure aluminium, whereas an effect on elongation has not been observed.     

电子束冷床炉熔炼制备高纯金属钒铸锭

电子束冷床炉熔炼是一种新兴的金属精炼方法。利用电子束冷床炉的高温真空精炼特性,以钒成分为82%钒铝合金为原料,制备了纯度在99.7%以上的金属钒铸锭。详细论述了电子束冷床炉在熔炼钒铝合金时各杂质元素的去除机理行为,认为熔炼时较大的电子束照射功率对一次铸锭中铝的挥发去除有较好效果,但这种熔炼工艺却会影响到铸锭的最终氧含量。分析认为,两次小功率熔炼是符合设备特点的制备高纯金属钒铸锭的最佳熔炼工艺。     

稀土对铝导线导电性能和力学性能的影响

本文研究了工业生产条件下，稀土铈、镧及混俣稀土对电工用铝导线导电性能和力学性能的影响。结果表明，稀土铈可显著提高强度，稀土镧可显著提高导电性。实验证明，稀土元素的添加量选择在０．２－０．３Ｗｔ％的最佳。     

DISPERSION-STRENGTHENED ALUMINIUM PRODUCTS MANUFACTURED BY POWDER BLENDING

Abstract

The microstructure of dispersion-strengthened aluminium products manufactured by powder blending has been examined by optical and transmission electron microscopy, and the mechanical properties have been determined at room temperature and at elevated temperatures by tensile- and creep-testing.

Powder variables, such as the size of the aluminium-powder particles and the size, volume concentration, and type of oxide (Al₂O₃, SiO₂, ZrO₂) used as the dispersed phase, have been investigated, together with manufacturing variables, such as temperature of the extrusion billet, reduction ratio in extrusion, and heat-treatment after extrusion. Major variables are the size of the aluminium particles and the oxide concentration, and generally it has been found that the strength increases and the elongation decreases for decreasing size of aluminium particles and increasing oxide concentration. The elongation measured after extended creep-testing is, however, practically the same for all products, of the order of 1-3%.

A subgrain structure is formed in the aluminium matrix during manufacturing. Subgrain-boundary-strengthening, which is effective at room temperature, is superimposed on oxide-strengthening; at elevated temperatures, oxide-strengthening only is of importance.

A model has been proposed that relates the flow stress (0.2% offset) to the size of aluminium particles and the oxide concentration, and good agreement with the experimental data has been found.     

Conversion of ionization measurements to radiation absorbed dose in non-water density material

The radiation absorbed dose to non-water equivalent materials of interest in radiotherapy is the dose to lung and the dose to bone. The measurement and calculation of dose to the lung has been of great interest and much effort has gone into the development of accurate lung dose calculation methods. The radiation absorbed dose to the bone is usually not calculated and most absorbed dose calculations have been done without correcting for the presence of bone. For the lower megavoltage photon beams this may be appropriate, however, as the energy of the photon beam increases, the region of electronic disequilibrium becomes larger and pair production which depends on the atomic number of the material becomes significant. Therefore the bone will produce greater perturbations of the dose distribution. The dose to lung-equivalent material is uniquely obtained from ionization measurements. However, in bone-equivalent materials two different calculations of absorbed dose are possible: the absorbed dose to soft tissue plastic (polystyrene) within bone-equivalent material and the dose to the bone-equivalent material itself. Both can be calculated from ionization measurements in phantoms. These two calculations result in significantly different doses in a heterogeneous phantom composed of polystyrene and aluminium (a bone substitute). The dose to a thin slab of polystyrene in aluminium is much higher than the dose to the aluminium itself at the same depth in the aluminium. Monte Carlo calculations confirm that the calculation of dose to polystyrene in aluminium can be accurately carried out using existing dosimetry protocols. However, the conversion of ionization measurements to absorbed dose to high atomic number materials cannot be accurately carried out with existing protocols and appropriate conversion factors need to be determined.     

电解铝多功能天车大梁开裂原因与对策

公司引进的四台电解多功能天车在使用中大梁频繁开裂,从多个角度分析了天车大梁开裂的原因,及彻底解决大梁开裂问题的对策。