新工艺制备AgZnO电接触材料的组织与性能研究  

Investigation on Microstructureand Performance of AgZnO Electrical Contact Material Fabricated by New Technology

作　　者：吴春萍[1] 易丹青[1] 李荐[1] 王斌[1] 许灿辉[1] 卢小东 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]佛山精密电工合金有限公司,佛山528000

出　　处：《电工材料》2007年第3期3-7,16,共6页Electrical Engineering Materials

基　　金："十一五"国家科技支撑计划重点项目(2006BAE03B03);广东省教育部产学研结合项目(2006D90404015)

摘　　要：采用气体雾化-烧结内氧化-热锻(atomization-internal oxidation-foring,缩写为AIOF)工艺制备AgZnO触头材料。用X射线衍射、金相显微镜和扫描电镜等研究了气体雾化法制备AgZn合金粉的粒度、形貌及成分,分析了AIOF工艺制备的AgZnO触头材料的相组成、显微组织和物理性能,并探讨了AgZn合金粉末压坯烧结内氧化的过程。结果表明:气体雾化法制备的AgZn合金粉末中,粒度小于125μm的粉末占总量的82%,颗粒多数为不规则形状;AIOF工艺制备的AgZnO材料组织均匀,电阻率为1.87μΩ.cm,相对密度为98%,硬度HV为102.8,其性能优于传统粉末冶金法制备的材料。AgZn合金粉末压坯烧结内氧化开始在粉末颗粒边界进行,然后逐渐深入颗粒内的晶界和晶粒内部,且ZnO的长大也首先发生在颗粒边界,因此颗粒边界上的ZnO比较粗。AgZnO electrical contact material was fabricated by gas atomization-sintering internal oxidation-hot forging technology （AIOF technology） in this paper. The granularity, morphology and component of Ag-Zn alloy powder prepared by gas atomization were studied, the phase constitution, microstructure and physical performance of AgZnO contact material fabricated by AIOF technology were analyzed using x-ray diffraction（XRD）, optical microscope（OM） and scanning electron microscope（SEM）, the process of inner oxidation during the sintering of Ag-Zn alloyed powder were discussed. The results show that the gas atomized Ag-Zn alloy powders below 12Stem is 82% total powders and most of the particle shape is irregular. The microstructure of AgZnO electrical contact material fabricated by AIOF technology was symmetrical, electrical contact resistance was 1.87μΩ·cm, relative density was up to 98% and hardness was 102.8HV, and these performances were better than that of Ag-Zn materials produced by conventional powder metallurgy technology. Internal oxidation process of Ag-Zn alloyed powder firstly occurred in the grain boundary of powder and then it gradually went deep into the grain boundary and grain inner of particle, and growth of ZnO particles were firstly occurred in the grain boundary of powder, so ZnO particles in the grain boundary of powder were thicker than that in the grain boundary.

关 键 词：AGZNO 电接触材料 显微组织 

分 类 号：TM205.1[一般工业技术—材料科学与工程]