NiAl金属间化合物的热爆合成过程研究  

Thermal Explosion of NiAl Intermetallic Compounds

作　　者：穆柏春[1] 师玉锦 郗丽清[3] 于景媛[1] 唐丽丹[1] 李强[1] 张辉[1] 

机构地区：[1]辽宁工业大学材料与化学工程学院 [2]朝阳东方粮食机械研究所 [3]营口职业技术学院

出　　处：《特种铸造及有色合金》2007年第12期903-905,共3页Special Casting & Nonferrous Alloys

基　　金：辽宁省自然科学基金资助项目(20062193;9910300401);辽宁省教育厅科研项目(200310078);辽宁省专利局资助项目

摘　　要：以Al粉和Ni粉为主要原料,采用自蔓延高温合成技术,制备Ni-Al基金属间化合物。绘制了热爆反应曲线、描述了热爆反应的过程,分析了热爆反应机理及产物的显微组织特征,研究了热爆反应的边界条件以及各种反应参数对热爆反应的影响。研究结果表明,升温速率和颗粒尺寸对热爆反应均有不同程度的影响。提高升温速率、减小颗粒尺寸均可缩短热爆反应的起始时间,降低热爆反应的起始温度。初步确定了反应起始温度低于Ni-Al系的最低共晶温度(640℃),Ni-Al系的热爆反应是由固-固扩散反应引发的,Ni-32Al的反应产物为单相、均一的NiAl相。Ni-Al intermetallic compounds were prepared with Al powder and Ni powder by SHS(self-propagating high-temperature synthesis).The thermal explosion curves were mapped,and the reactive process was described.Meanwhile,the mechanism of thermal explosion and the microstructure of products were analyzed,and the boundary conditions as well as the effects of variables on thermal explosion were expounded.The results indicate that the ignition time and temperature of thermal explosion can be declined with increasing heating rate and reducing particle size,in which the ignition temperature of reaction is lower than the eutectic temperature.The thermal explosion of Ni-Al system is induced by solid-solid diffusion reaction,and the reaction product singular NiAl phase of Ni-32Al can be observed.

关 键 词：自蔓延高温合成 热爆 Ni—Al 反应参数 

分 类 号：TG392[金属学及工艺—金属压力加工]