注射成形制作高孔隙率NiTi形状记忆合金的实验研究.pdfVIP

第42卷 第1期 上 海 交 通 大 学 学 报 VoI．42 NO．1 2008年 1月 J()URNAI，OF SHANGHAI jIAOTONG UNIVERSITY Jart．2008 文章编号：1006—2467(2008)01—0087—04 注射成形制作高孑L隙率NiTi 形状记忆合金的实验研究 张利祥， 胡国新 (上海交通大学 机械与动力工程学院，上海 200240) 摘 要：采用金属粉末注射成形方法制备了镍钛形状记忆合金坯体，利用溶剂脱粘和热脱粘的方 法脱除坯体中的粘结剂．实验测试了溶剂脱粘时间和温度对粘结剂脱除率以及脱粘速度的影响，结 果表明：溶剂脱粘时间延长，粘结剂脱除率不断升高，最高可达98．8％；溶剂脱粘速率曲线随时间 分为3段．用SEM观测烧结后形状记忆合金的微观孔隙结构结果表明，注射成形制作NiTi多孔合 金孔径约 lmm，孔隙率可达75 ．XRD分析NiTi形状记忆合金的成分含量结果表明，多孔体的主 相为NiTi相． 关键词：金属注射成形；溶剂脱脂；粘结剂；形状记忆合金 中图分类号：TG 139．6 文献标识码：A Experimental Investigation on Porous NiTi Shape Memory Alloy by Metal injection Molding ZHANG Li—xiang． HU Guo—xin (School of Mechanical Engineering，Shanghai Jiaotong University，Shanghai 200240，China) Abstract：This paper dealt with the metal inject molding(MIM)of NiTi shape memory alloy(SMA)．The polymeric binders in the NiTi were removed by methods of solvent debinding and thermal debinding．The paper investigated the effect of the debinding time and temperature on the extraction of the binders and the debinding rate．The results show that the weight loss of the polymeric binders is increased with the in— crease of the debinding time and the debinding temperature，and it can even reach 98．8 ．The debinding rate curves can be divided into three portions．The microstructure of the pore structure of the porous NiTi SMA was observed by SEM ，the porosity is 75 ；the pores size is about 1000 m．Finally，the XRD method was used to analyze the microstructure phase of the NiTi SMA．it shows that the NiTi phase is predominant in the total amount． Key words：metal inject molding(MIM)；solvent debinding；binders；shape memory alloy(SMA) 形状记忆合金(SMA)是一种具有感知和驱动 发，在工程中不断寻找研究和应用的可行性，至今