树脂增强选择性激光烧结多孔金属件的研究  

Enhancement of mechanical performance of porous metallic parts by resin infiltration and selective laser sintering

作　　者：陈继兵[1] 史玉升[2] 刘锦辉[1] 

机构地区：[1]黑龙江科技学院现代制造工程中心,哈尔滨150027 [2]华中科技大学塑性成型模拟及模具技术国家重点实验室,武汉430074

出　　处：《哈尔滨工业大学学报》2009年第5期140-143,共4页Journal of Harbin Institute of Technology

基　　金：湖北省自然科学基金创新群体项目(2004ABC001)

摘　　要：针对选择性激光烧结(SLS)间接方法成型的金属零件形坯,经脱脂和高温烧结后形成的零件存在大量孔隙和空洞,其致密度和强度都较低,不能满足实际应用要求的问题,采用改性耐高温环氧树脂浸渗零件烧结坯的方法,使多孔金属件致密化,并粘结内部金属网架,提高零件的机械性能.对浸渗烧结坯的拉伸强度的测试和扫描电镜(SEM)以及热失重(TGA)的分析结果表明,浸渗树脂后的烧结坯拉伸强度提高了约4倍;改性环氧树脂和金属网架粘结在一起,形成一个密实的网络结构,致密度大幅提高;零件可在200℃的温度下使用.该方法可以制造注塑模具和功能零件.Metal green parts fabricated by indirect selective laser sintering（SLS） have low density and mechanical properties after decomposition and high temperature sintering. In order to improve their performance, modified heat-resistance epoxy resin was used to infiltrate porous metal parts to densify them and make them bond with metallic particulate. The results of tests on the tensile strength and analyses with Scanning Electronic Microscope （SEM） and Thermal Gravity Analysis （TGA） show that the tensile strength of metallic parts is enhanced by about 4 times, compared with that of those without the epoxy resin infiltrated, at the same time, its density is greatly improved and the heat resistance temperature is up to 200 ℃. Therefore ,the plastic injection mold and function part can be manufactured through this method.

关 键 词：选择性激光烧结 耐高温环氧树脂 浸渗 强度 

分 类 号：TB324[一般工业技术—材料科学与工程]