摘要
为明确固相反应法合成Ti Si2的工艺条件与反应机理,以高纯钛粉和硅粉为原料,采用固相反应法合成Ti Si2。通过X射线衍射、扫描电镜、能谱分析等方法研究了合成试样的物相组成和微观形貌,并结合热力学计算结果探讨了Ti-Si二元系的反应机理,建立了合成Ti Si2的反应模型。研究表明:在Ti-Si二元反应体系中,反应最先得到的物相为Ti5Si3,升高反应温度,Ti5Si3进一步与Si反应生成Ti Si2;硅粉粒度减小,Ti Si2合成温度降低,适当延长保温时间有助于Ti Si2的合成。
Ti Si2 was synthesized by solid phase reaction method using high-purity titanium powder and silicon powder as raw materials. In order to understand the processing conditions and reactive mechanism,the mass phase composition and morphology of sample were studied by X-ray,SEM and EDS analysis method. In combination with thermodynamic calculation result,the reaction mechanism in Ti-Si binary system has been discussed and reaction model of synthesizing Ti Si2 was built. The research results show that in Ti-Si binary system, Ti5Si3 phase first appears during reactive course. As reactive temperature rises,Ti5Si3 further reacts with Si to form Ti Si2; as the particle size of silicon powder decreases,the start forming temperature will drop. Hold time properly prolonging is benefit for formation of Ti Si2.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第11期3006-3010,3021,共6页
Journal of Synthetic Crystals
基金
陕西省自然科学基金(2013JM6013)
关键词
TISI2
反应机理
固相反应
反应模型
TiSi2
reaction mechanism
solid phase reaction
reaction model
