高纯铝的研究进展

本文主要介绍了国内外生产高纯铝的企业、主要生产工艺及生产设备,对国内外高纯及超高纯铝的研究现状及进展情况进行了分析总结。     

高纯铝的研究进展

本文主要介绍了国内外生产高纯铝的企业、主要生产工艺及生产设备,对国内外高纯及超高纯铝的研究现状及进展情况进行了分析总结。     

高纯铝的研究进展

超高纯铝比原铝具有更好的导电性、延展性、反射性和抗腐蚀性,在电子工业及航空航天等领域有着广泛用途,目前国内只有极少数厂家能够生产纯度达 99.999%(质量分数）的高纯铝。主要介绍了国内外生产高纯铝的企业、主要生产工艺及生产设备,对国内外高纯及超高纯铝的研究现状及进展情况进行了分析总结。     

高纯铝生产与应用的研究及发展展望

分别介绍了高纯铝的基本定义、常见生产工艺、国内外生产企业及其性能指标和市场应用情况.三层液电解法和偏析法是国内外生产高纯铝广泛使用的工艺方法,对这两种工艺方法的基本原理进行了较为详细的描述和优劣比较.最后对高纯铝未来的市场前景提出了展望.     

高纯铝定向凝固提纯技术应用研究

高纯铝是目前最主要的电子新材料,通过定向凝固工艺获得的高纯铝具有纯度高、成本低的优势,该法目前被产业界广泛采用。简单介绍了定向凝固技术的原理,重点分析了国内外高纯铝定向凝固技术的新工艺、新方法,最后对高纯铝定向凝固技术存在的问题及发展趋势进行了分析总结。     

精铝及铝精炼

介绍了精铝的性质及用途,铝精炼的几种方法,包括三层液电解精炼法、偏析法和区域熔炼法等。     

退火工艺对阳极铝箔组织和性能的影响

利用金相显微分析、蚀坑腐蚀等方法研究了不同退火工艺对用偏析法提纯和三层液法提纯两种不同精铝原料配比生产的高压阳极铝箔再结晶组织及表面晶粒大小、取向、形貌及分布的影响.结果表明:再结晶组织主要由立方织构组成,偏析法提纯生产的阳极箔在300℃保温1 h完成再结晶,立方织构占有率趋于最大值,三层液法提纯的阳极箔在350℃保温...     

世界高纯铝的生产、市场与应用

本文较为详细地介绍了全世界(含中国)高纯铝的市场概况及应用场合。2003年底全世界高纯铝的生产能力约129kt/a,需求量约74kt。可生产高纯铝的国家:中国、日本、俄罗斯、美国、挪威、德国、法国等。2004年中国高纯铝的生产能力可达38kt/a。高纯铝的75%以上用于轧制电解电容器铝箔。5N级超纯铝的95%用于半导体器件,用作超导体的占5%。4N高纯铝的价格比99.7%重熔锭的高10000元/t),5N高纯铝的价格约比99.7%重熔锭的高62000元/t。     

高纯铝生产过程的氢含量控制

描述了ALPUR除气系统在高纯铝生产过程中除氢除杂效果;采用AISCAN^TM测氢装置对除气前后过程进行一系列测试;采用PODFA^TM和LIMCA^TM测试系统对除气系统的除杂能力进行测试。通过测试结果的分析,证明了ALPUR除气系统的高效性。     

The Surface Tension of Pure Aluminum and Aluminum Alloys

The surface tension of high purity and commercial purity aluminum in vacuo was determined using the sessile drop method and the results were found to compare favorably with published data. The effects of holding atmosphere, substrate, and “surface fracture” of the sessile drop on the measured surface tension values were investigated together with the effects of different solute elements commonly present in commercial aluminum alloys. The results obtained suggest that the nature of the surface oxide film formed on the droplets (affected by alloy composition and atmosphere) and the rupture of this film are the dominant factors influencing the surface tension values obtained. Changes in surface tension values of up to 60 pct were observed. The possible effect of this variable surface tension on practical casting processes, such as direct chill casting, is suggested.     

高纯铝倾动炉节能技术的探索与实践

主要介绍了高纯铝倾动式熔保炉燃烧系统改造的思路及节能原理,着重阐述了蓄热式燃烧技术在高纯铝熔保炉上的应用,并与原冷风烧嘴炉的使用情况进行了对比分析。     

Recrystallization in Commercially Pure Aluminum

Recrystallization behavior in commercial aluminum with a purity of 99.4 pct was studied by techniques such as high voltage electron microscopy, 100 kV transmission electron microscopy, and light microscopy. Sample parameters were the initial grain size (290 and 24 microns) and the degree of deformation (5 to 30 pct reduction in thickness by cold-rolling). It was found that the original grain boundary region is the preferred site for nucleation. A few intragranular nuclei were, however, also observed. The effectiveness of the nucleation sites is enhanced by the presence of intermetallic particles (FeAl₃), which start to become operative when the degree of deformation is raised from 15 to 30 pct. The temperature of nucleation and of recrystallization decreases when the degree of deformation is increased and the initial grain size is decreased. The recrystallized grain size follows the same trend and it is observed that the refinement of the recrystallized grain size caused by an increasing degree of deformation and decreasing initial grain size is enhanced by the FeAl₃ particles (when the degree of deformation is raised from 15 to 30 pct). Finally, the structural and kinetic observations are discussed and compared with results from an earlier study¹ covering the recrystallization behavior of commercial aluminum of the same purity deformed at higher degrees of deformation (50 to 90 pct reduction in thickness by cold-rolling).     

纤维增强铝基复合材料研究进展

介绍了纤维增强铝基复合材料的性能特点，主要制造工艺和应用现状。阐述了纤维增强铝基复合材料的研究进展。     

铝薄带快速铸轧技术研究

常规连续铸轧工艺存在铸轧速度低、生产率不高的问题.为此,华北铝业有限公司、中南大学和涿神公司合作开发研制了中国第一台超薄快速铸轧机,于2001年12月至2006年进行了多次工业试验,成功地生产出厚度为3.0 mm的铝箔毛料,最大铸轧速度达到4.7 m/min,产能提高了20%,并生产出合格的0.007mm铝箔.这些试验对今后的工业生产有一定指导意义.     

5052铝合金材料研究进展

介绍了国内外5052铝合金材料研究的最新成果,从合金的熔炼铸造、塑性加工及热处理等方面,综述了提高5652铝合金综合性能采用的方法和技术,并提出了合金研究的发展方向。     

稀土在铝和铝合金中应用的研究及进展

稀土元素作为微量元素加入铝及其合金中,不仅有细化晶粒的变质作用,还有净化熔体、减少气体含量及氧化夹杂的精炼效果,从而可显著改善和提高铝及其合金的综合性能.分析讨论了稀土在铝及铝合金中的作用,论述了稀土在铝及铝合金中的开发应用现状,展望了稀土铝合金的发展前景.     

Substrate Stimulated Orientation for Pure Aluminum

Oriented materials are of great importance, but their formation is rarely described. Here, nine Al/Al₂O₃ systems were designed to identify the dominant factors. Electron back-scattered diffraction indicates that the new Al crystal(s) with one or multiple orientation(s) can be stimulated by one single-crystal Al₂O₃ substrates. Synchrotron radiation diffraction shows that the preferred orientation(s) is/are determined based on the initial stage of the liquid–solid transition. The nonpreferred orientation can be suppressed through competition.

     

铝电解节能研究进展

本文对铝电解节能降耗、减少污染方面的研究进行综述,重点从惰性阳极、惰性阴极、电解槽侧壁、低温熔盐铝电解以及室温离子液体中铝电解的研究几个方面进行分析介绍,并且对未来铝电解生产节能进行了展望。