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考察了添加少量纳米SiCp对铜基材料电学和摩擦学性能的影响。结果表明:添加少量纳米SiCp(体积分数为0.5%),轻微降低了铜基材料的导电率,显著提高了耐磨性,有效降低了铜/钢摩擦副之间的粘着作用和材料转移;130nm SiCp/Cu基复合材料的导电性和耐磨性都优于30nm SiCp/Cu基复合材料。 相似文献
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高新科技的快速发展对高性能铜材料的开发提出了更高的要求,铜基复合材料因具有较高的强度和良好的导电导热性、耐磨耐腐蚀性、高温稳定性等而得到广泛的应用,其制备工艺在不断发展,且近年来取得了很大进展.综述了铜基复合材料主要制备工艺,包括粉末冶金法、铸造法、机械合金化法、内氧化法、原位合成法、熔体浸渗法和搅拌摩擦法等的特点及其研究进展,并对铜基复合材料制备工艺今后的发展方向进行了展望. 相似文献
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为了制备导电性能良好的石墨/铜基复合材料,研究了球磨时间、热压烧结及热挤压等工艺参数对其导电性能的影响;用扫描电镜分析了材料的拉伸断口形貌.结果表明:复合材料的导电性随球磨时间的延长和挤压温度的提高呈现先升高后降低的规律;提高挤压比和烧结温度、增加热压烧结时的压力以及延长烧结保温时间均有利于改善复合材料的导电性;球磨3h石墨/铜复合粉经压制(压力700 MPa、保压30 s)、真空热压烧结(压力48 MPa、烧结温度600℃、保温1h)和热挤压(挤压温度750℃、挤压比16)后,铜基体连接成连续的三维网络,且石墨均匀分布在网络之间,有效地发挥了石墨/铜基复合材料中铜的导电性. 相似文献
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采用粉末冶金法制备石墨烯增强铜基复合材料,研究全方位行星球磨机的球磨速度、球磨时间和球料比对复合材料的密度、显微硬度、导电率和拉伸性能的影响,并利用扫描电子显微镜(SEM)分析复合材料的显微形貌。结果表明:采用合适的球磨参数,石墨烯在铜基体中分散均匀;但球磨时间过长、球磨速度过快会导致石墨烯团聚,与铜基体之间的界面结合效果变差;随球料比的增加,复合材料的抗拉强度、延伸率和导电率明显改善;球磨速度为400 r/min时,显微硬度和导电率显示出相似的变化趋势。球磨时间直接影响石墨烯在铜基体中分散效果,球磨转速和球料比则影响铜粉颗粒的塑性变形以及石墨烯与铜基体的有效结合,当球料比为3∶1,球磨速度为300 r/min,球磨时间为6~8 h时复合材料的性能最优。 相似文献
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纳米颗粒增强铜基摩擦材料的摩擦学性能 总被引:2,自引:0,他引:2
基于粉末冶金法分别制备了纳米氮化铝和纳米石墨增强铜基摩擦材料,研究了纳米颗粒对铜基摩擦材料的摩擦磨损和耐热性能的影响规律.采用扫描电子显微镜(SEM)分析了材料的微观结构和磨损形貌,并利用惯性摩擦磨损试验机考核其摩擦学性能.实验结果表明:与未添加纳米颗粒的摩擦材料相比,添加纳米氮化铝和纳米石墨的摩擦材料的摩擦因数高而稳定,且随接合次数增加无明显衰退现象;耐磨性能分别提高了25%和11%;耐热性能分别提高了18%和25%.未添加纳米颗粒的摩擦材料的磨损机制主要为犁沟式磨料磨损,纳米氮化铝和纳米石墨能减少摩擦材料的磨料磨损,从而增强了摩擦材料的耐磨性.实验结果显示,纳米氮化铝和纳米石墨可显著提高铜基摩擦材料的摩擦学性能. 相似文献
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为提高铜基粉末冶金摩擦材料的耐磨性及制动效果,使用粉末冶金法(PM)制备氧化铝增强铜基摩擦材料,采用布氏硬度计、扫描电子显微镜(SEM)、能量色散光谱仪(EDS)等测试手段以及摩擦磨损实验,研究氧化铝的掺杂对摩擦材料微观组织和摩擦行为的影响。结果表明:在制备的铜基摩擦材料中,氧化铝硬质颗粒在铜基体中分布均匀,由于硬质相的存在所形成位错钉扎效应对复合材料的硬度有大幅的提升,而对材料的密度有一定的消极作用。摩擦实验结果显示,氧化铝可以提高材料的摩擦因数并增强其耐磨性;且随着载荷的增大Al2O3-Cu复合材料的摩擦因数较高且稳定性较好,磨损率有明显的降低,表明氧化铝的掺杂对铜基材料有显著的增强效果。通过光学显微镜以及EDS分析得出,Cu基材料的主要磨损机制为氧化磨损和黏着磨损,而Al2O3-Cu材料的磨损机制为氧化磨损和磨粒磨损组成的混合磨损。 相似文献
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A new class of antifriction polymer composite materials, i.e. carbon plastics, is considered in terms of their application in machine building. They exceed traditional antifriction polymer materials in their characteristics. The use of sliding bearings made of carbon plastics in ship and energy machine building has shown their high efficiency. 相似文献
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Advances in tribology: the materials point of view 总被引:6,自引:0,他引:6
The application of advanced materials in various areas of contemporary technology can lead to improvements in the function, quality and performance of engineering components and systems. In this paper, an overview of the developments in high performance materials, both organic and inorganic based, is given. This includes thin hard coatings because of their increasing importance in tribological improvements. For these types of materials the requirements for tribo-engineering applications are analysed. Research results from BAM concerning ceramics and ceramic composites, polymers and polymer composites as well as hard coatings illustrate the friction and wear behaviour of these materials and their potential for tribo-engineering applications. 相似文献
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本文概述了现代汽车用非金属材料的类别 ,通过对现代汽车用典型非金属材料选择和应用状况的分析 ,阐述了汽车非金属材料在汽车材料发展中越来越重要的地位。 相似文献
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《机械工程学报(英文版)》2020,33(3):5-31
Solid particle erosion is a common phenomenon in engineering fields, such as manufacturing, energy, military and aviation. However, with the rising industrial requirements, the development of anti-solid particle erosion materials remains a great challenge. After billions of years of evolution, several natural materials exhibit unique and exceptional solid particle erosion resistance. These materials achieved the same excellent solid particle erosion resistance performance through diversified strategies. This resistance arises from their micro/nanoscale surface structure and interface material properties, which provide inspiration for novel multiple solutions to solid particle erosion. Here, this review first summarizes the recent significant process in the research of natural anti-solid particle erosion materials and their general design principles. According to these principles, several erosion-resistant structures are available. Combined with advanced micro/nanomanufacturing technologies, several artificial anti-solid particle erosion materials have been obtained. Then, the potential applications of anti-solid particle erosion materials are prospected. Finally, the remaining challenges and promising breakthroughs regarding anti-solid particle erosion materials are briefly discussed. 相似文献
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梯度折射率材料是一种崭新的光学材料。在光学成像系统和光纤通讯中有广泛的应用前景。本文叙述了用离子交换法制作梯度折射率材料的原理和方法以及材料主要性能的测试。 相似文献