粉末冶金制备多孔NiTi形状记忆合金的差热分析  

Differential thermal analysis of porous NiTi alloy prepared by powder metallurgy

作　　者：林岳宾 刘爱辉 庄治平 LIN Yuebin;LIU Aihui;ZHUANG Zhiping(Faculty of Mechanical and Material Engineering,Huaiyin Institute of Technology,Huaian 223005,China)

机构地区：[1]淮阴工学院机械与材料工程学院,江苏淮安223005

出　　处：《粉末冶金工业》2022年第5期31-35,共5页Powder Metallurgy Industry

基　　金：江苏省自然科学基金资助项目(BK20151291);江苏省333工程资助项目(BRA2015377)。

摘　　要：借助扫描电子显微镜和差热分析仪,研究Ni-Ti混合体系在不同加热速率下的显微组织和反应温度,考察了加热速率对Ni和Ti化学反应进程的影响,并利用Kissinger方程对Ni-Ti混合体系的反应动力学参数进行计算,以期进一步调控粉末冶金过程中Ni与Ti间的化学反应,制备优质的多孔NiTi形状记忆合金。结果表明:随着加热速率的提高,Ni-Ti混合体系的化学反应显著增强,反应放热量明显增大,但初始反应温度变化不大;Ni-Ti混合体系的反应活化能为130 kJ/mol,反应速率常数为5.6×10^(-3),反应级数为1.26。With the help of scanning electron microscope and differential thermal analyzer,the microstructure and reaction temperature of Ni-Ti mixed system under different heating rates were studied,and the effect of heating rate on the chemical reaction process of Ni and Ti was investigated.The reaction kinetic parameters of Ni-Ti mixed system were calculated by Kissinger equation,in order to further regulate the chemical reaction between Ni and Ti in the process of powder metallurgy and prepare high-quality porous NiTi shape memory alloy.The results show that with the increase of heating rate,the chemical reaction of Ni-Ti mixed system is significantly enhanced,and the reaction heat release is significantly increased,but the initial reaction temperature changes little.The reaction activation energy of Ni-Ti mixed system is 130 kJ/mol,and the reaction rate constant is 5.6×10^(-3),the reaction order is 1.26.

关 键 词：粉末冶金 多孔NITI合金 差热分析 显微组织 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TF12[金属学及工艺—合金]