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LaSrCuO4粉體微結(jié)構(gòu)對Ag/LSCO電接觸材料性能的影響
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1.浙江工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;2.浙江加州國際納米技術(shù)研究院

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浙江省重點研發(fā)計劃資助項目(No. 2017C01051)；國家自然科學(xué)基金資助項目(No. 51801180)


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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    摘要:

    以硝酸鑭、硝酸銅、硝酸鍶等為原料，分別采用固相法、溶膠-凝膠法和共沉淀法合成了不規(guī)則顆粒狀(LSCOg)、介孔狀(LSCOm)和片層狀(LSCOl)的LaSrCuO4(LSCO)粉體。采用高能球磨并結(jié)合初壓-初燒-熱壓工藝制備出Ag/LSCO電接觸材料。利用X 射線衍射(XRD)、掃描電鏡(SEM)、金屬電導(dǎo)率儀、維氏硬度計和電壽命試驗機(jī)等對粉體形貌及電接觸材料的物理和電學(xué)性能進(jìn)行了表征。結(jié)果表明：與Ag/LSCOm、Ag/LSCOl材料相比，Ag/LSCOg電接觸材料表現(xiàn)出更加優(yōu)異的物理性能，其電阻率為2.37 μΩ ? cm，硬度為800 MPa，密度為9.32 g/cm3；但電學(xué)性能差異較小，其在AC220V12A開斷狀態(tài)下的燃弧能量為400 mJ、燃弧時間為23 ms，關(guān)合狀態(tài)下的燃弧能量為1500 mJ，燃弧時間為 68 ms。Ag/LSCO電接觸材料的主要失效形式是液滴噴濺，微裂紋和孔洞。

    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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引用本文

鄭曉華,吳君臣,吳新合,王貴蔥,沈濤,張玲潔,楊芳兒. LaSrCuO4粉體微結(jié)構(gòu)對Ag/LSCO電接觸材料性能的影響[J].稀有金屬材料與工程,2020,49(4):1306~1311.[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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  • 收稿日期:2019-05-12
  • 最后修改日期:2019-11-26
  • 錄用日期:2019-11-26
  • 在線發(fā)布日期: 2020-05-07
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