共查询到19条相似文献,搜索用时 156 毫秒
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隔离开关设备是电网中一种重要的开关类设备,大量的敞开式隔离开关在户外装用,受环境因素影响较大。为了增大通流能力、减小回路电阻,通常对隔离开关导电杆、动静触头表面进行镀银处理。通过对近年来隔离开关设备现场运行情况进行统计分析,发现隔离开关动静触头镀银层磨损、脱落情况频发,造成回路电阻增大、隔离开关出现发热缺陷。本文针对隔离开关动静触头的三种镀银方式:普通镀银、镀硬银、石墨镀银,分别进行了大量机械操作试验,分时分阶段地观察镀银层磨损情况、测量镀银层厚度及回路电阻,通过试验结果分析论证三种镀银方式的厚度、硬度及抗磨损等性能。 相似文献
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熔渗法AgW(75)触头材料研究 总被引:2,自引:0,他引:2
电触头作为电器设备的关键元件之一,既是载流体,又是机械零部件,要求具有良好的导电导热性、耐电孤烧损、抗熔焊、低而稳定的接触电阻、有一定的强度和易于机械加工等。本研究采用粉末冶金熔渗技术制备AgW(75)电触头材料,对其进行复压、复烧,并测量了其力学物理性能和显微组织。结果表明,粉末冶金熔渗技术与复压复烧相结合制备的AgW(75)触头材料的相对密度高,硬度达到国家标准要求,但材料收缩性大。 相似文献
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<正> 奶形触头是SN10系列断路器的主要零部件,为了保证导电性能和良好的电接触,一般表面复盖采用镀银,但该零件在镀银过程中却常有“针孔”出现:即在镀层上有些微小的凹孔或点状穴。针孔影响银层与基体的结合力,影响外观质量和其表面粗糙度。为了防止、消除针孔,提队镀银质量,我们 相似文献
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反应合成AgSnO2电接触材料的组织与性能研究 总被引:9,自引:1,他引:9
采用反应合成技术和传统粉末冶金技术制备银氧化锡(AgSnO2)电接触材料。利用千瓦CO2激光器模仿电弧作用在试样表面产生局部熔化,对AgSnO2块体材料进行抗熔蚀性测试。对AgSnO:块体材料进行电导率测试和X射线衍射分析,对块体材料及冷拉拔的AgSnO2线材进行显微组织分析(扫描电镜、透射电镜)。研究结果表明,采用反应合成技术可以在银基体中合成尺寸细小、界面新鲜的SnO2颗粒,所制备的AgSnO2电接触材料中,微米级的SnO2颗粒系由纳米级的SnO2颗粒聚集而成I反应合成法制备的AgSnOz电接触材料较传统粉末冶金法制备的AgSnO2电接触材料具有更高的导电性和抗熔蚀性;该方法制备的AgSnO2电接触材料由于改变了Ag、SnO2的结合状态使材料的加工性能、导电性能和抗熔蚀性同时得到改善和提高。 相似文献
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通过物理添加方式向锌镍电池正极活性物质氢氧化镍[Ni(OH)_2]中混入银粉、铜粉和钴粉等金属粉末。用极化曲线、电化学性能测试和SEM分析对试样进行研究。银粉对镍电极性能的提升作用好于铜粉;银粉和钴粉能提高电极的耐腐蚀性能,且添加钴粉的镍电极在6 mol/L KOH+10 g/L LiOH溶液中的缓蚀效率最高,铜粉会加速电极腐蚀。综合考虑,添加钴粉的镍电极性能最优,适宜的添加量为5%。该电极以0.2 C充放电(充电6 h,放电至1.2 V),前30次循环的循环保持率为89%,最大放电比容量为247.7 mAh/g。 相似文献
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WC/Cu大电流滑动电接触材料的研究 总被引:2,自引:0,他引:2
为了提高电接触材料的导电、导热等性能,笔者采用粉末冶金溶渗技术制备出WC/Cu滑动电接触材料,并对其显微组织和性能进行了系统研究。结果表明:WC60~90/Cu滑动电接触材料随着WC含量的增加,材料的密度由11.508 g/cm3增加到13.305 g/cm3,硬度由HB187增加到HB477,导电率由14.6 m/(Ω.mm2)下降到10.6 m/(Ω.mm2)。耐磨性随着WC含量的增加显著提高,但高Cu含量的孕育期较长。磨损机制以磨粒磨损和表面接触疲劳为主。建议使用含量为WC70/Cu30~WC80/Cu20的滑动电接触材料。 相似文献
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将采用化学沉淀法制备的Bi掺杂量为25%(原子分数)的SnO2纳米颗粒(Sn0.75Bi0.25O2)作为增强相,借助于粉末冶金法制备了AgSnO2(12)电接触材料,分析了Bi元素掺杂对电接触材料性能的影响。试验结果表明,Sn0.75Bi0.25O2纳米颗粒增强的AgSnO2(12)电接触材料组织结构均匀,密度、硬度高,导电性好。电性能试验表明,Sn0.75Bi0.25O2纳米颗粒增强材料的燃弧时间短、能量低,接触电阻低且稳定,抗电弧侵蚀能力强。 相似文献
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The results of experimental studies of the influence of the plasmodynamic deposition conditions of a copper coating on an aluminum contact surface on the contact resistance of an aluminum-copper high-current contact pair with a copper coating are presented. A significant decrease in contact resistance relative to an ordinary contact between aluminum and copper is observed as a result of optimization of the phase composition and structure of the transition layer. 相似文献
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The questions of the application of novel diffusion-alloying high-nitrogenous steel powders for repair and surface hardening of responsible parts of power equipment by plasma spraying are considered. The appropriateness of the method for operative repair of equipment and increasing its service life is justified. General data on the structure, properties, and manufacture of nitrogen-, aluminum-, and chromium-containing steel powders that are economically alloyed using diffusion are described. It is noted that the nitrogen release during the decomposition of iron nitrides, when heating, protects the powder particles from oxidation in the plasma jet. It is shown that the coating retains 50% of nitrogen that is contained in the powder. Plasma spraying modes for diffusion-alloying high-nitrogenous steel powders are given. The service properties of plasma coatings based on these powders are analyzed. It is shown that the high-nitrogenous steel powders to a nitrogen content of 8.9 wt % provide the necessary wear resistance and hardness of the coating and the strength of its adhesion to the substrate and corrosion resistance to typical aggressive media. It is noted that increasing the coating porosity promotes stress relaxation and increases its thickness being limited with respect to delamination conditions in comparison with dense coatings on retention of the low defectiveness of the interface and high adhesion to the substrate. The examples of the application of high-nitrogenous steel powders in power engineering during equipment repairs by service companies and overhaul subdivisions of heat power plants are given. It is noted that the plasma spraying of diffusion-alloyed high-nitrogenous steel powders is a unique opportunity to restore nitrided steel products. 相似文献