摘要
分别以粉末钛粉、硅粉、石墨和钛粉、碳化硅、石墨为原料,采用热压烧结法制备了Ti3SiC2材料,借助XRD和SEM手段研究了原料体系和烧成温度对试样相组成、致密化程度和显微结构的影响,并分析了反应烧结机理。结果表明:(1)随着温度的升高,钛粉-硅粉-石墨体系较钛粉-碳化硅-石墨体系合成出的Ti3SiC2块体材料纯度更高;(2)钛粉-硅粉-石墨体系在烧结温度低于1300℃时,主要以Ti5Si3、TiC和残余的硅粉、石墨反应生成Ti3SiC2,在烧结温度为1300～1600℃时,主要以形成的液相Ti-Si(L)与TiC反应生成了Ti3SiC2;钛粉-碳化硅-石墨体系在1485℃液相出现之后,颗粒经历重排和溶解再析出的过程,在液相中生成Ti3SiC2。
The Ti3SiC2 ceramic material was synthesized by hot-pressing sintering process from Ti,Si,C and Ti,SiC,C powders,respectively.XRD and SEM were employed to study effects of the raw material system and firing temperature on the phase constituents,densification and microstructure of the samples,and the reaction mechanism was analyzed as well.The results show：（1） with the temperature increasing,the purity of Ti3SiC2 material prepared was higher using the Ti-Si-C system than the Ti-SiC-C system;（2） when elemental powders were used,the Ti3SiC2 phase was synthesized by the reaction of TiC,Ti5Si3 phase and the remainder of Si and C at 1300℃,and the Ti3SiC2 phase was synthesized by the reaction of TiC phase with Ti-Si liquid phase in the temperature range of 1300～1600℃.When Ti,SiC,C were used as raw materials,with the emergence of liquid phase at 1485℃,the grains underwent the process of rearrangement,dissolution and precipitation,and Ti3SiC2 phase was formed by liquid phase reaction.
出处
《陶瓷学报》
CAS
北大核心
2012年第1期11-16,共6页
Journal of Ceramics
关键词
TI3SIC2
热压烧结
相组成
显微结构
反应机理
titanium silicon carbide
hot pressing
phase constituent
microstructure
reaction mechanism
