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描述了一种制备Ag/Sn O2电接触材料(Sn O2的质量分数为12%)的新方法。首先采用共沉淀法制备Ag-Sn O2纳米复合粉体(Sn O2的质量分数为42%)并对该Ag-Sn O2纳米复合粉体进行了表征。XRD结果表明制备的复合粉体由纯立方相的Ag和四方金红石相的Sn O2组成;SEM及TEM结果表明,纳米Sn O2与纳米Ag颗粒均匀弥散分布在复合粉体中;并借助于TG-DTA热分析对纳米复合粉体前驱体的制备过程进行了分析。然后,将Ag-Sn O2纳米复合粉体与Ag粉混合,采用粉末冶金法制备成Ag/Sn O2电接触材料,并对制备的Ag/Sn O2电接触材料进行了表征。结果表明,由于纳米Sn O2在Ag基体中弥散分布,制备的材料的物理性能如密度、硬度及电导率比普通工艺制备的材料好。
A new method of preparing Ag / Sn O2 electrical contact material (Sn O2 mass fraction of 12%) is described. First, Ag-SnO2 nanocomposite powder (42% SnO2) was prepared by co-precipitation method and the Ag-SnO2 nanocomposite powder was characterized. XRD results show that the prepared composite powder consists of pure cubic phase of Ag and SnO2 of tetragonal rutile phase. SEM and TEM results show that nano-SnO2 and nano-Ag particles are uniformly dispersed in the composite powder; and by means of TG- DTA thermal analysis of nanocomposite powder precursor preparation process was analyzed. Then, Ag-SnO2 nanocomposite powder and Ag powder were mixed, Ag / SnO2 electrical contact material was prepared by powder metallurgy, and the prepared Ag / SnO2 electrical contact material was characterized. The results show that due to the dispersed distribution of nano-SnO2 in the Ag matrix, the prepared materials have better physical properties such as density, hardness and electrical conductivity than the materials prepared by ordinary processes.