新聞資訊
添加LaB6的CuW70觸頭材料的電弧侵蝕行為
發布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時間：2015-12-03
采用粉末冶金和熔滲法制備不同LaB6添加量的CuW70合金，研究LaB6含量對CuW70合金組織、致密度、硬度、導電率及真空擊穿性能的影響。
添加LaB6的CuW70觸頭材料的電弧侵蝕行為Arc erosion behaviors of CuW70 electricalcontact materials adding LaB6
采用粉末冶金和熔滲法制備不同LaB6添加量的CuW70合金，研究LaB6含量對CuW70合金組織、致密度、硬度、導電率及真空擊穿性能的影響。結果表明：隨著LaB6含量的增加，CuW70合金的硬度先急劇增大后緩慢減小，當LaB6含量為2%(質量分數)時，CuW70合金的硬度最大，為212 HB。CuW70合金的電導率先增大后緩慢減小，但降幅不大。真空電擊穿實驗表明：隨著LaB6含量的增加，CuW70合金的耐電壓強度先急劇上升，當LaB6含量大于2%后，耐電壓強度呈下降趨勢；截流值先下降后緩慢上升；電弧壽命則呈上升趨勢。在本實驗范圍內，當LaB6添加量為2%時，CuW70合金具有最佳的耐電弧侵蝕性能，耐電壓強度、截流值和電弧壽命分別為1.25×108?V/m、2.62 A和15.67 ms。
CuW70 alloys with different contents of LaB6?addition were prepared by powder metallurgy and infiltrating method, and the effects of LaB6?content on microstructure, densification, hardness, electrical conductivity and electrical breakdown properties were investigated. The results show that with increase of LaB6?addition, the hardness increases sharply and then decreases slowly, the CuW70 alloy with 2%LaB6?(mass fraction) has the maximum hardness value of 212 HB, while the electrical conductivity increases and then decreases slightly. The vacuum electrical breakdown experimental results show that, with the increase of LaB6?addition, the breakdown strength increases sharply and then decreases when the LaB6?content is above 2%. The chopping current decreases and then increases slowly, whereas, the arc life presents an increasing trend. In the range of the experiments, CuW70 alloy with 2% LaB6?has an optimal arc erosion resistance, and the breakdown strength, chopping current and arc life are 1.25×108?V/m, 2.62 A and 15.67 ms, respectively.
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