高强高导铜合金的研究现状及发展趋势

综述了高强高导铜合金的研究现状,系统阐述了合金化法和复合材料法制备高强高导铜合金的方法和机理;介绍了高强高导铜合金领域的研究热点和重点问题,即快速凝固法制备高强高导铜合金及稀土等微合金化元素在高强高导铜合金中的应用,分析了高强高导铜合金的发展趋势,指出沉淀强化和复合强化是提高材料强度并保持其良好导电性能的有效途径,并结合我国的资源特点,提出了推动该材料产业化应用的方向.     

高速电气化铁路用铜合金接触线的研究进展

对铜合金接触线的性能特点、国内外的研究和开发应用进行了综述,介绍了作者近期在新型高强高导接触线方面研究的新成果,阐述了高强高导铜合金接触线的发展方向.     

探索高强高导铜合金最佳成分的尝试

通过对一系列强度≥500MPa、导电率≥70％IACS的铜合金框架材料的化学成分、组织和性能分析,指出适当的强化相组合是获得高强高导材料的有效途径,提出用综合影响因数（Ke）来表示强化相形成元素缃入对材料强度和导电率影响的新观点,通过研究表明在铜合金材料中出现的强化相按其对强度及导电率的综合影响效果排队次序依次为：Cu3Zr、Cr、ComPn、Fe2P、Fe、2Ti和MgmPn。     

高强高导铜合金的研究状况

高强高导电铜合金是一类具有优良综合性能的功能材料和结构材料,被广泛应用于电子、机械等领域,本文阐述了高强高导铜合金的研究现状,系统介绍了此类合金的强化机理、制备方法及组织和性能特点,并且分析了稀土的作用机制及对该类铜合金性能的影响,最后展望了该类合金的发展前景。     

引线框架材料的研究发展现状

引线框架材料是半导体元器件和集成电路封装的主要材料之一,其主要功能为电路连接、散热、机械支撑等作用.随着IC向高密度、小型化、低成本方向的发展,对引线框架材料提出了高强度、高导电、高导热等多方面性能上的要求.由于拥有良好的导热性能,铜合金已成为主要的引线框架材料.对电子封装引线框架材料的性能要求、设计理论以及国内外研究发展现状等进行了综述.     

高强高导铜合金设计思路及其应用

综述了高强高导铜合金的设计思路，分析了不同高强高导铜合金的强化机制和导电机制，并指出了高强高导铜合金的发展动向。     

高强高导铜合金研究进展

高强高铜合金是一类具有发展潜力的功能材料。评述了几种新发展起来的高强高导铜合金的制备技术，并对其存在问题及发展趋势进行了评论。分析指出快速凝固已成为进一步改善合金化法制备高强高导铜合金综合性能的有效手段；机械合金化、定向凝固和塑性变形等复合强化方法代表着今后高强高导铜合金的发展方向，但其工艺较为复杂，生产成本较高，有待进一步研究开发。     

高强高导铜合金的研究概述EI

高强高导铜合金是一类很有应用潜力的功能材料，近年来研究和开发应用高强高导铜基合金取得了显著成效。本文叙述了开发和研究高强高导铜合金的基本原理及制备方法，并对国内外高强高导铜合金的研究和开发应用现状进行了综述，同时，阐述了高强高导铜合金的发展方向及应用前景。     

微量Zr对Cu-Ag合金力学性能的影响

采用真空熔炼的方法制备了一种新型的高强高导兼顾的铜合金材料Cu-Ag-Zr合金。利用显微硬度测试、金相和透射电镜分析等方法，研究了微量zr对Cu．Ag合金力学性能的影响．结果表明，微量Zr的加入，能显著提高Cu-Ag合金的显微硬度和再结晶温度，使Cu-Ag合金的再结晶软化温度提高200℃以上，Cu-Ag-Zr合金经550℃退火2h后，其显微硬度仍保持为128Hv，能够满足高强高导铜合金高温性能的要求；微量Zr对Cu-Ag合金的强化主要通过使该合金中形成细小、弥散分布的析出相来实现的。     

IC引线框架用Cu-Cr-Zr系材料的研究现状与发展

从合金设计、制备方法、热处理和加工工艺4个方面介绍了国内外引线框架用Cu-CR-ZR系铜合金的研究、生产和应用的现状,以及获得高强度、高电导Cu-CR-Zr系铜合金的基本原理与方法.指出我国高强高导铜合金材料制备的基础研究还有待提高,高精度板带加工技术还比较落后,自动化、规模化生产还比较薄弱.只有开发出具有自主知识产格的技术和产品,才能实现我国高强高导材料发展的历史性飞跃.     

快速凝固高强高导铜合金的研究现状及展望

本文综述了快速凝固高强度高导电率铜合金的研究现状 ,并对将来的发展趋势作了展望。指出 ,快速凝固铜合金的凝固过程对合金的最终显微组织结构起重要作用 ,因而 ,对其进行深入细致的研究具有重要意义。     

快速凝固高强高导铜合金的研究现状及展望

本文综述了快速凝固高强度高导电率铜合金的研究现状 ,并对将来的发展趋势作了展望。指出 ,快速凝固铜合金的凝固过程对合金的最终显微组织结构起重要作用 ,因而 ,对其进行深入细致的研究具有重要意义。     

热交换器用高耐蚀铜合金的研究进展

综述了国内外热交换器用高耐蚀铜合金的研究进展,并对各种耐蚀铜合金的耐蚀性能和适用水质进行了比较,指出了热交换器管材的发展趋势.     

Precipitation hardening of Cu-Fe-Cr alloys part I Mechanical and electrical properties

This research is part of a project whose scope was to investigate the engineering properties of new non-commercial alloy formulations based on the Cu rich corner of the Cu-Fe-Cr ternary system with the primary aim of exploring the development of a new cost-effective high-strength, high-conductivity copper alloy. The literature indicated that Cu rich Cu-Cr and Cu-Fe alloys have been thoroughly investigated. A number of commercial alloys have been developed and these are used for a variety of applications requiring combinations of high-strength, high-conductivity and resistance to softening. Little evidence was found in the literature that the Cu rich corner of the Cu-Fe-Cr system had previously been investigated for the purpose of developing high-strength, high-conductivity copper alloys resistant to softening. The aim of these present investigations was to explore the possibility that new alloys could be developed that combined the properties of both sets of alloys, ie large precipitation hardening response combined with the ability to stabilise cold worked microstructures to high temperatures while at the same maintain high electrical conductivity. To assess thefeasibility of this goal the following alloys were chosen for investigation: Cu-0.7wt%Cr-0.3wt%Fe, Cu-0.7wt%Cr-0.8wt%Fe, Cu-0.7wt%Cr-2.0wt%Fe. This paper reports on the mechanical property investigation which indicated that the Cu-0.7wt%Cr-0.3wt%Fe, and Cu-0.7wt%Cr-2.0wt%Fe alloys were worthy of further investigation.     

高强高导Cu-Cr-Zr系合金纳米析出相及其作用机理的研究进展

Cu-Cr-Zr系合金是目前高强高导电铜合金研究的热点,其优异的性能与其纳米析出相密切相关.综述了不同合金体系纳米析出相的晶体结构,总结了合金中各合金元素的作用机理和微量稀土元素的作用,指出了当前研究中存在的问题,并展望了其今后的发展.     

Investigation and analysis of arc ablation on WCu electrical contact materials

In this paper, arc ablation behavior of tungsten–copper (WCu) alloy contacts was investigated by the measurement of weight-loss, or erosion rate, and microstructures of tungsten–copper alloy contacts were examined by using scanning electron microscopy after electrical breakdown process. Experimental results showed that the arc erosion process started at the tiny sharp edges, then the arc spreaded on the second phases, or copper phase on the surface. Because of electrons/ions bombardment, the rapid evaporation and sputtering of liquid copper droplets were serious. As a result, an even contact surface became rugged, and tungsten skeleton remained because of being less eroded. With the increase of applied breakdown voltage, the ablation of tungsten–copper alloy became more significant. The WCu alloys with a higher content of copper showed more severe erosion rate as compared with that with a higher tungsten content under the same erosion conditions. Furthermore, when the number of breakdown is less, WCu alloys with a high copper content are easier for erosion for the conditions of fewer numbers of breakdowns. Whereas, WCu alloys with a high content of tungsten are easier for ablation for the conditions with many times of arc breakdown.     

Effect of Ammonia and Sulphide Environment on 90/10 and 70/30 Cupronickel Alloy

Copper nickel alloys 90/10 and 70/30 are used extensively in saltwater systems operating on marine platforms and offer high corrosion and biofouling resistance. However, systems using these materials were reported to fail prematurely. Preliminary investigations revealed pollution of harbor waters with tangible levels of ammonia and sulphides which was reported to be the primary cause of failure. The present author(s) have performed laboratory and field investigations to identify the stress-material-environment interaction of the copper nickel alloys extensively in use on seawater system of marine platforms. Results obtained point to the fact that polluted seawaters can affect the material properties of the alloy leading to premature failure(s) of systems at stresses well below the designed stress. The paper presents the correlation of the results of the laboratory and field tests of 90/10 and 70/30 copper–nickel alloys in seawaters polluted with ammonia and sulphide pollutants.     

Cast aluminium alloy composites containing copper-coated ground mica particles

An electroless method of coating copper on ground mica particles using copper sulphate solution is described. The effects of time of sensitization, PdCl₂ concentration and time of stirring the activated particles in electroless solution, on the extent of copper coating on mica particles are reported. Using this method it is possible to deposit up to about 35 wt% copper on mica particles. A process for making cast aluminium alloy-mica particle composite alloys using these coated particles is also described. The process involves stirring the copper-coated mica particles into liquid alloys using an impeller, and casting the melts containing suspended mica particles in suitable permanent moulds. Coating of copper on mica particles makes possible the dispersion of ground mica particles in molten aluminium alloys with high recoveries which is otherwise difficult, even when magnesium is added to the surface of the melts. Copper coating on ground mica particles masks the basal planes, and apparently increases their wettability with aluminium alloy melts. Recoveries of ground mica particles in composite castings made using copper-coated mica particles are as high as 80%, which is three times higher than the corresponding recoveries in the castings made using uncoated particles. The mechanical properties of cast aluminium mica composites made using copper-coated ground mica powders are adequate for a variety of bearing and antifriction applications.