热爆合成TiC/Ni_3Al金属间化合物基复合材料的研究  

Thermal Explosion Synthesis of TiC/Ni_3Al Intermetallic Matrix Composites

作　　者：李新星[1] 王树奇[2] 

机构地区：[1]宿迁学院计算机科学与技术系,江苏宿迁223800 [2]江苏大学材料学院,江苏镇江212000

出　　处：《稀有金属》2012年第5期845-850,共6页Chinese Journal of Rare Metals

基　　金：国家教育部留学回国人员启动基金;江苏大学高级人才启动基金(1283000058)

摘　　要：采用热爆合成技术制备TiC/Ni3Al复合材料,通过DSC,XRD,SEM等分析手段对Ti-C-3Ni-Al体系热爆反应过程及复合材料进行了研究。结果表明:Ni,Al在反应生成Ni3Al的同时引发了Ti和C之间生成TiC的反应,形成了纯净的TiC/Ni3Al复合产物,Ti-C-3Ni-Al体系的反应温度与TiC含量无关。热爆产物的微观组织形貌跟体系成分及热爆温度有关,TiC含量愈高,TiC颗粒粒度愈大,热爆产物中微观孔隙愈少;TiC颗粒的粒度随热爆温度的升高而增大,形状从近球形发育成多边形。热爆产物的致密度随着TiC含量增加及热爆温度的升高均表现出先增加后减小的变化趋势。当TiC含量为35%左右,热爆温度为750℃左右时,产物致密度最高。不同成分复合材料的显微硬度不同,TiC含量增加,复合材料显微硬度显著提高。TiC-reinforced Ni3Al composites were fabricated through thermal explosion reaction.The thermal explosion reaction process of Ti-C-3Ni-Al system and the composites were analyzed by differential scanning calorimetric（DSC）,X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results showed that the reaction of titanium and carbon was ignited by the reaction of nickel and aluminum.Pure TiC/Ni3Al products were synthesized by the thermal explosion.The reaction temperature of Ti-C-3Ni-Al system was independent of TiC contents.The system composition and thermal explosion temperature were found to have obvious influences on the morphology of the composites.With the increase of TiC contents,TiC particulates became coarser and the micro pores of the products decreased.The relative density of the products increased at first and then decreased with the rise of the thermal explosion temperature and TiC contents.The microhardness of the composite was revealed to be higher with higher TiC content.

关 键 词：TIC/NI3AL 热爆 微观形貌 致密度 显微硬度 

分 类 号：TB39[一般工业技术—材料科学与工程]