凝胶注模多孔NiTi合金的固化工艺及动力学研究  

Research on Curing Process and Kinetics of Gel Casting of Porous NiTi Alloy

作　　者：何志强 王泽 段柏华[1] He Zhiqiang;Wang Ze;Duan Bohua(School of Materials Science and Engineering,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《稀有金属材料与工程》2023年第7期2658-2664,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51874368)。

摘　　要：以氢化脱氢钛粉和雾化镍粉为原始粉末,单体甲基丙烯酸羟乙酯(HEMA)和交联剂1,6-己二醇二丙烯酸酯(HDDA)组成凝胶体系,采用凝胶注模法制备多孔NiTi合金。研究了引发剂(过氧化苯甲酸叔丁酯,TBPB)、催化剂(N,N-二甲基苯胺,DMA)、固化温度及固相体积分数对固化过程的影响。结果表明:随着引发剂及催化剂加入量的增加,固化时间降低,最佳的催化剂用量(质量分数)为1.5%,引发剂用量(质量分数)为2%;固化反应随着固化温度及固相体积分数的增加而加快;根据DSC测试结果,计算得到HEMA-HDDA-TBPB-DMA凝胶体系的固化反应表观活化能为60.15 kJ·mol^(-1),反应级数为0.91。在最佳固化工艺条件下,利用固相体积分数为45%的NiTi浆料制备了孔隙率为43.87%、抗压强度为104 MPa,且具有三维连通双级孔隙结构的多孔NiTi合金。Porous NiTi alloy was prepared by the gel casting method using titanium powder and atomized nickel powder as the original powders and hydroxyethyl methacrylate(HEMA)-1,6-hexanediol diacrylate(HDDA) as the gel system.The effects of initiator,catalyst,curing temperature and solid volume fraction on the curing process were investigated.The results show that the curing time decreases with the increasing of initiator and catalyst addition,and the best dosage of catalyst N,N-dimethylaniline(DMA) is 1.5wt%,and the best dosage of initiator tert-butyl peroxybenzoate(TBPB) is 2wt%.The curing reaction is accelerated with the increasing of curing temperature and solid phase volume fraction.Based on the DSC test results,the apparent activation energy of the curing reaction of the HEMA-HDDA-TBPB-DMA gel system is obtained as 60.15 kJ·mol^(-1),and the reaction order is 0.91.Porous NiTi alloy with porosity of 43.87%,compressive strength of 104 MPa and three-dimensional connected two-stage pore structure is prepared using 45vol% NiTi slurry under the optimal curing process condition.

关 键 词：凝胶注模 多孔NITI合金 固化动力学 固化工艺 

分 类 号：TB383[一般工业技术—材料科学与工程]