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CuCr触头材料小电流下阴极斑点与截流值研究 丁秉钧1,段文新1,杨志懋1,郭聪慧1 (1.西安交通大学,金属材料强度国家重点实验室,陕西,西安,710049) 摘要:研究了在峰值电流分别为10A和80A的小击穿电流下,CuCr25与CuCr50合金阴极斑点蚀坑形貌的差异.通过比较阴极斑点蚀坑的大小和分布,分析了CuCr触头材料显微组织中Cr相尺寸的大小对阴极斑点运动和蚀坑形貌的影响.采用示波器直接测量出截流值和电弧寿命,结合CuCr合金阴极斑点蚀坑形貌的分布,从现象和机理上解释了CuCr25合金截流值低于CuCr50合金的原因.这些结果对通过优化CuCr合金的显微组织以降低触头材料的截流值提供了有力的依据. 关键词:CuCr触头材料; 阴极斑点; 截流值; [全文内容正在添加中] ......
Contact reactive brazing of Al alloy/Cu/stainless steel joints and dissolution behaviors of interlayer WU Ming-fang1, 2, SI Nai-chao1, CHEN Jian2 1. School of Material Science and Engineering... of liquid diffusion welding process. After the heating temperature reaches the eutectic temperature, eutectic liquid will be formed between the base metal and reactive material through contact reaction......
Modelling and simulation of contact force in cold rotary forgingQIN Xun-peng(秦训鹏) (School of Automotive Engineering, Hubei Key Laboratory of Advanced Technology of Automotive Parts, Wuhan University of Technology, Wuhan 430070, China)Abstract:Cold rotary forging is an advanced and complex metal forming technology with continuous local plastic deformation. Investigating the contact force between......
J. Cent. South Univ. (2021) 28: 1570-1583 DOI: https://doi.org/10.1007/s11771-021-4716-8 Predictions of friction and flash temperature in marine gears based on a 3D line contact mixed lubrication... temperature in the marine timing gears during one meshing circle based on the 3D line contact mixed lubrication simulation, which had been verified by comparing the flash temperature with those from Blok’s......
; 文章编号:1672-7207(2019)09-2100-09 Virtual material based modeling for contact stiffness characteristics of bolted joint interface XIAO Huifang1, SUN Yunyun1, XU Jinwu1, SHAO Yimin2 (1..., China) Abstract: Avirtual material modeling method of rough contact interface based on the statistical model was proposed in which the bolted joint interface was equivalent to a layer of virtual material......
后续烧结对爆炸压实CuCr合金显微组织的影响 孟松鹤1,罗守靖2,李金平1,韩杰才1 (1.哈尔滨工业大学复合材料与结构研究所,哈尔滨,150001;2.哈尔滨工业大学材料科学与工程学院,哈尔滨,150001) 摘要:对爆炸压实CuCr合金坯采用两种低温烧结处理工艺,通过观察其显微组织变化研究了后续烧结对爆炸压实CuCr合金显微组织的影响.结果表明,氢气烧结处理后的CuCr组织呈现出液相烧结的特征,而真空烧结处理后表现为固相烧结的特征,经烧结处理后的组织比爆炸坯的组织细小.Cu,Cr合金坯经低温烧结处理后,仍由Cu相,Cr相以及少量氧化物组成.另外,微区内出现轻微的成分偏析,烧结体含有大量的应变条纹和位错. 关键词:CuCr合金; 爆炸压实; 后续烧结; 显微组织; [全文内容正在添加中] ......
(10) electrical contact material 图2 Ag/ZnO(10) 电触头制备工艺流程图 Fig. 2 Flow diagram of manufacture technology of Ag/ZnO(10) electrical contact material 1.2 电弧侵蚀试验 本实验采用小容量ASTM触头模拟动作与电性能测试系统...%的相似性；操作次数为30000次时,电弧时间比40000时次要大；操作次数为10000次时,电弧时间最大. 表1 Ag/ZnO(10)电触头的物理性能 Table 1 Physical properties of Ag/ZnO(10) electrical contact material 图3 电弧侵蚀模拟实验装置示意图 Fig. 3 ......
Influence of Rare Earths on Contact Fatigue of Rail Steels ZHU Gui-lan1,MA Teng1 (1.Department of Physics, Central Iron and Steel Research Institute, Beijing 100081, China) Abstract:Rail/wheel contact fatigue of NbRE rail, Nb rail and U74 rail was investigated using contact fatigue tester. Microstructure and morphology as well as microhardness in the fatigue profiles were analyzed by scanning......
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Effect of flank angle and friction coefficient on contact stress of turbine rotorWU Xiao-zan(伍晓赞), TAO Qing-bin(陶庆斌), CHEN An-ping(陈安平), XU Hui(徐慧)(1. School of Physics Science and Technology... in aeroengine, based on the ANSYS, the simplification model of the turbine rotor was built up. By applying the simplification model, the contact stress of turbine rotor was computed. The maximum contact......
