粉末烧结法制备多孔铜及其性能研究

Preparation and Characterization of Porous Copper by Powder Sintering Method

以铜粉和K_2CO_3颗粒为原料,用粉末烧结法制备出孔隙率为69%~81%的多孔铜。通过扫描电子显微镜(SEM)、能谱仪(EDS)观察分析其微观组织和化学成分,研究原料配比、烧结温度对孔隙率及压缩性能的影响,分析孔隙率与吸能效率的关系。结果表明,多孔铜内孔洞大小不一,大孔直径约180~210μm,小孔直径约2~6μm;多孔铜中造孔剂K_2CO_3已充分溶解,且随着铜与K_2CO_3配比的减少,多孔铜孔隙率增大,同时多孔铜压缩曲线平台区随着孔隙率增大而增长;烧结温度对孔隙率以及压缩性能影响较小;孔隙率对吸能性有影响,孔隙率越大其吸能性越好。

Porous copper with porosity ranging from 69% to 81% was prepared by powder sintering method. The raw materials were copper powder and K2CO3 powder. The microstructure and chemical composition were observed and analyzed by SEM and EDS. The effects of material ratio and sintering temperature on the porosity and compressive properties were studied, and the relationship between the porosity and the energy absorption was analyzed. The results show that the pore size is different, the average size of macro-pores is 180-210μm and average size of micro-pores is 2--6 μm. The K2CO3 is fully dissolved and the ratio of copper and K2CO3 powder decreasing results in porosity increasing and a relatively long plateau region. Sintering temperature has less influence on the porosity and compression performance and with the porosity increasing, the energy-absorption properties becomes better.