(西安理工大學(xué)材料科學(xué)與工程學(xué)院，西安 710048)
摘 要: 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(duì)CuW70合金組織、致密度、硬度、導(dǎo)電率及真空擊穿性能的影響。結(jié)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(dāng)LaB6含量為2%(質(zhì)量分?jǐn)?shù))時(shí)，CuW70合金的硬度最大，為212 HB。CuW70合金的電導(dǎo)率先增大后緩慢減小，但降幅不大。真空電擊穿實(shí)驗(yàn)表明：隨著LaB6含量的增加，CuW70合金的耐電壓強(qiáng)度先急劇上升，當(dāng)LaB6含量大于2%后，耐電壓強(qiáng)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(shí)驗(yàn)范圍內(nèi)，當(dāng)LaB6添加量為2%時(shí)，CuW70合金具有最佳的耐電弧侵蝕性能，耐電壓強(qiáng)度、截流值和電弧壽命分別為1.25×108 V/m、2.62 A和15.67 ms。
關(guān)鍵字: CuW70合金；觸頭材料；LaB6；電擊穿；電弧燒蝕
（School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, China）
Abstract: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.
Key words: CuW70 alloy; contact material; LaB6; electrical breakdown; arc erosion
