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Effects of microstructure of LaSrCuO4 powders on properties of Ag/LSCO electrical contact materials
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1.College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou;2.Zhejiang-California International Nanotechnology Institute,Hangzhou

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    Abstract:

    Lanthanum nitrate, copper nitrate, strontium nitrate and so on were used as raw materials to synthesize the irregular granular (LSCOg), mesoporous (LSCOm) and lamellar (LSCOl) LaSrCuO4 (LSCO) powders by solid phase method, sol-gel method and co-precipitation method respectively. Ag/LSCO electrical contact materials were prepared by high-energy ball milling combined with initial pressing, sintering and hot pressing. The morphology of LSCO powders and the microstructure, physical and electrical properties of Ag/LSCO materials were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), conductivity instrument, Vickers hardness tester and electrical life tester. The results show that, compared with Ag/LSCOm material and Ag/LSCOl material, Ag/LSCOg material exhibits a lower resistivity of 2.37 μΩ?cm, higher hardness of 800 MPa, higher average density of 9.32 g/cm3. Under the conditions of AC220V 12A, the arcing energy and arcing time of Ag/LSCOg electrical contact material are 400 mJ and 23 ms for breaking state, 1500 mJ and 68 ms for closing state. The failure modes of Ag/LSCO electrical contact materials are droplet splashing, micro-cracks and micro-holes.

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[Zheng Xiao-hua, Wu Jun-chen, Wu Xin-he, Wang Gui-cong, Shen Tao, Zhang Ling-jie, Yang Fang-er. Effects of microstructure of LaSrCuO4 powders on properties of Ag/LSCO electrical contact materials[J]. Rare Metal Materials and Engineering,2020,49(4):1306~1311.]
DOI:10.12442/j. issn.1002-185X. SG20190083

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History
  • Received:May 12,2019
  • Revised:November 26,2019
  • Adopted:November 26,2019
  • Online: May 07,2020
  • Published: