凝胶注模成形制备铜锡多孔材料的研究

Research on CuSn10 porous material prepared by non-aqueous gelcasting process

采用非水基凝胶注模工艺,对铜锡复合粉体进行了成形与烧结的研究。非水基凝胶注模的单体为甲基丙烯酸-2-羟基乙酯,溶剂为1,2-丙二醇,交联剂为二乙二醇丙烯酸酯,引发剂催化剂为过氧化苯甲酰-N,N-二甲基苯胺,分散剂采用聚乙烯比咯烷酮。制备出不同固相含量的悬浮液,经过凝胶成形与烧结,得到铜锡烧结多孔材料。探讨了坯体的性能、烧结过程中的收缩率、孔隙率、显微结构和力学性能。结果表明：经过脱模干燥后的坯体抗弯强度最大能达到12.76 MPa,坯体中的金属粉末颗粒均匀分散在有机三维骨架中,对于烧结多孔材料,随着固相含量的增加,烧结体密度增大,烧结收缩率降低,抗压性能提高。烧结试样孔隙率在20%～40%之间,烧结收缩率小于12%,抗弯强度最大为240 MPa,制备的烧结多孔材料孔隙分布均一、能制备复杂形状的部件。

CuSn10 porous metal material with controlled porosity and pore size were prepared by non-aqueous gelcasting technique. The process was based on the heat-initiated gelation characteristics of non-aqueous system of 2-Hydroxyethyl methacrylate（HEMA） and Ethylene glycol diacrylate（DEDA）. Suspension with different solid contents were prepared in the experiment. And the porous copper-based materials were obtained after gel-casting and sintering. The morphology of green and sintered specimenswere investigated,and the radial shrinkage ratio,porosity,density and mechanical properties were analyzed. The results indicate that the bending strength of green bodies can reach 12. 76 MPa,and metal particles in green bodies are uniformly dispersed in the three dimensional organic network. For sintered metal porous materials,the density,Brinell hardness and compressive properties increase with increasing solid contents of suspension. The sintered samples have porosityranged from 22. 18% to 35. 66%,sintering shrinkage rate of less than 12%,bending strength of 240 MPa.