(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙410083；
2. 中南大學(xué) 有色材料科學(xué)與工程教育部重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙410083)
摘 要: Ag/SnO2電接觸材料具有良好的耐電弧侵蝕和抗材料轉(zhuǎn)移性能，廣泛應(yīng)用于低壓斷路器和繼電器中。 然而，其制備初期組織和物理性能對(duì)產(chǎn)品鉚釘?shù)碾娦阅苡兄钪苯雍蜆O為重要的影響。采用X射線衍射分析儀(XRD)、場(chǎng)發(fā)射掃描電鏡(SEM)和電子探針顯微分析儀(EPMA)等手段，分析合金元素Sb、La和In對(duì)Ag/SnO2材料制備初期組織演變和物理性能的影響。結(jié)果表明：添加Sb、La 和In的Ag/SnO2燒結(jié)坯中除了含Ag和SnO2相外，還分別含有AgSbO3、La2Sn2O7和2In2O3？3SnO2相。添加Sb的Ag/SnO2燒結(jié)坯中氧化物主要在粉末邊界上呈網(wǎng)絡(luò)狀分布；添加La的Ag/SnO2燒結(jié)坯中氧化物顆粒細(xì)小，且均勻彌散分布；添加In的Ag/SnO2燒結(jié)坯中氧化物呈塊狀分布，且存在純銀層。添加In的Ag/SnO2材料的電導(dǎo)率和硬度最高，添加Sb的Ag/SnO2材料的相對(duì)密度最大。
關(guān)鍵字: Ag/SnO2材料；合金元素；組織演變；物理性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China）
Abstract:Ag/SnO2 electrical contact material has excellent arc erosion resistance and material transfer resistance, which is widely used in low-voltage circuit breakers and relays. However, the microstructure and physical properties at the initial stage of preparation have the most direct and important influence on the electrical properties of the rivets. In this paper, the influence of alloying element Sb, La and In on the microstructure evolution and the physical properties of Ag/SnO2 materials at the early stage of reaction synthesis were studied by X-ray diffractometer (XRD), scanning electron microscope (SEM) and electron probe X-ray micro-analyzer (EPMA). The results show that, besides Ag and SnO2 phases, AgSbO3 phase exists in Ag/SnO2 sintered compact with Sb adding, La2Sn2O7 phase exists in Ag/SnO2 sintered compact with La adding, and 2In2O3？3SnO2 phase exists in Ag/SnO2 sintered compact with In adding. The oxides in the Ag/SnO2 sintered compact with Sb mainly distribute on the alloy powders surface and form network microstructure. The oxide particles in the Ag/SnO2 sintered compact with La are fine and dispersed uniformly. The oxides in Ag/SnO2 sintered compact with In are distributed in blocks, and there is a pure silver layer. The conductivity and hardness of the Ag/SnO2 material with In are the highest, the relative density of the Ag/SnO2 material with Sb is the largest.
Key words: Ag/SnO2 materials; alloying element; microstructure evolution; physical properties
