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钙钛矿型La1-xSrxCoO3-δ粉体的制备及其在银基电接触材料中的应用
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浙江大学,浙江大学,浙江大学,浙江大学,浙江大学,温州宏丰电工合金股份有限公司;温州宏丰电工合金股份有限公司,温州宏丰电工合金股份有限公司;温州宏丰电工合金股份有限公司,浙江大学;;浙江大学;;温州宏丰电工合金股份有限公司;温州宏丰电工合金股份有限公司

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(浙江省科技计划项目,项目号2017C01051;浙江省自然科学基金,LQ17E010002)SSS


Preparation of perovskite La1-xSrxCoO3-δ Powders and its application in Silver based electrical contact materials
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Zhejiang-California International Nanosystems Institute,Zhejiang University,Zhejiang-California International Nanosystems Institute,Zhejiang University,Zhejiang-California International Nanosystems Institute,Zhejiang University,Zhejiang-California International Nanosystems Institute,Zhejiang University,Zhejiang-California International Nanosystems Institute,Zhejiang University,Wenzhou HongFeng Electrical Alloy Co,Ltd Wenzhou,Wenzhou HongFeng Electrical Alloy Co,Ltd Wenzhou,Zhejiang-California International Nanosystems Institute,Zhejiang University;China;;Department of Materials Science and Engineering,Zhejiang University;China;;Wenzhou HongFeng Electrical Alloy Co,Ltd Wenzhou;China

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    摘要:

    采用溶胶-凝胶法和粉末冶金工艺分别制备了颗粒状和网孔状La0.5Sr0.5CoO3-δ(LSCO)粉体及其Ag-LSCO电接触复合材料。优化了溶液pH,溶胶预处理温度等工艺对LSCO粉体微结构的影响,并考察成型压力,烧结温度等对Ag-LSCO材料电学、力学性能的影响研究。采用扫描电镜、X-射线衍射仪、D60K数字金属电导率测量仪和HVS-1000型数显显微硬度计等对LSCO粉体及Ag-LSCO电接触材料进行了微观形貌、物相结构、电导率与硬度等性能表征。结果表明:以柠檬酸为单一胶凝剂,当pH为9.5,在700℃烧结8h可获得颗粒状LSCOp粉体;而以柠檬酸和EDTA为复合胶凝剂时,于前驱体溶液pH=9.5,溶胶预处理温度200℃,烧结温度700℃,8h条件下合成网孔块体结构的LSCOw粉体。经成型压力及烧结制度的优化结果可知,成型压力(1100MPa)、烧结温度900℃,6h 为制备Ag/LSCOw电接触材料的最佳工艺参数。相比于Ag-LSCOp电接触复合材料,Ag-LSCOw表现出更低的电阻率(2.5μΩcm)。

    Abstract:

    The LSCOp and LSCOwpowders were synthesized by sol-gel method. And then Ag-LSCOpand Ag-LSCOw electrical contact composites were fabricated by high-energy ball milling and sintering process with LSCO powders as the second reinforcement phase. The effects of pH and pre-treated sol temperature on the microstructure of LSCO powder were optimized. The effects of molding pressure and sintering temperature on the electrical and mechanical properties of Ag-LSCO contacts were investigated. The microstructure and phase of LSCO powders and Conductivity and hardness characteristics of the Ag-LSCO electrical contact material were tested by scanning electron microscopy (SEM), X-ray diffractometer(XRD), D60K digital metal conductivity meter and HVS-1000 digital microhardness tester. The results showed that LSCOp was obtained at pH= 9.5 and sintering temperature of 700℃ for 8 h when using single citric acid as gelling agent, but LSCOw was obtained with citric acid and EDTA used as complex gelling agents. Ag/LSCOw electrical contact materials were prepared with the molding pressure of 1100 MPa, sintering temperature of 900℃ and sintering time of 6h. And when using LSCOw powder as the second reinforcement phase, Ag-LSCOw electrical contacts showed lower resistivity than that of Ag-LSCOp.

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沈涛,张继,张玲洁,杨辉,樊先平,陈晓,祁更新,赵良奎.钙钛矿型La1-xSrxCoO3-δ粉体的制备及其在银基电接触材料中的应用[J].稀有金属材料与工程,2018,47(S2):48~52.[Shen Tao, Zhang Ji, Zhang Lingjie, Yang Hui, Fan Xianping, Chen Xiao, Qi Gengxin, Zhao Liangkui. Preparation of perovskite La1-xSrxCoO3-δ Powders and its application in Silver based electrical contact materials[J]. Rare Metal Materials and Engineering,2018,47(S2):48~52.]
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  • 收稿日期:2017-12-12
  • 最后修改日期:2017-12-12
  • 录用日期:2018-02-01
  • 在线发布日期: 2018-11-01
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