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采用机械合金化、冷等静压成型、烧结、热挤压等粉末冶金技术集成的方法制备Ag/SnO2(12)材料,并对其组织与性能进行研究。研究结果表明:通过机械合金化的方法获得的Ag/SnO2(12)复合粉末,粉末颗粒形状不规则,为多层片状银的叠加,粒径的范围在20～50μm,SnO2颗粒细小且均匀弥散镶嵌于Ag基体中;Ag/SnO2(12)复合材料中SnO2颗粒细小,组织均匀,力学性能良好,但由于材料采用粉末冶金方法制备,不可避免的存在少量的孔隙,从而影响了材料的电学性能,电阻率偏高;其断口形貌为解理脆性断裂(宏观)和准解理断裂(微观)的综合。
The Ag / SnO2 (12) material was prepared by mechanical alloying, cold isostatic pressing, sintering, hot extrusion and other powder metallurgical techniques. The microstructure and properties of Ag / SnO2 (12) The results show that Ag / SnO2 (12) composite powder obtained by mechanical alloying has irregular shape of powder particles and superposition of multilayered silver flakes with particle size in the range of 20-50 μm. SnO2 particles are fine and uniform The AgO2 / SnO2 (12) composite has the characteristics of small size, uniform microstructure and good mechanical properties. However, due to the powder metallurgy method, a small amount of pores inevitably exist, which affects the electrical properties of the material Performance and high resistivity. The fracture morphology is a combination of cleavage brittle fracture (macro) and quasi-cleavage fracture (micro).