摘要
在Ti-B体系中引入PTFE作为反应促进剂,实现了Ti B_2-Ti C粉体的低温固相合成。分别采用热分析仪、X射线衍射仪和场发射扫描电子显微镜,测定了体系的反应温度,表征了生成物的物相和微观形貌,并对其反应过程和反应机理进行了分析。合成实验在氩气炉中进行,结果表明:当添加10wt%PTFE时,能够在550℃通过固相反应制备出平均粒径小于400 nm的Ti B_2-Ti C复合陶瓷粉体。DTA测试表明固相反应合成过程主要包括两步:首先,在低温下PTFE和Ti发生反应并释放出大量的热,然后,诱发Ti和B的固相反应生成Ti B_2。
TiB2-TiC composite powders were prepared at low temperature in the Ti-B system with the PTFE polytetrafluoroethylene（polytetrafluoroethylene） as a chemical activator. Reaction temperature, phase composition and morphology were measured via differential thermal analysis, X-ray diffraction and field emission scanning electron microscopy（FESEM） in order to explore the reaction mechanism, respectively. Actual solid-state reaction synthesis experiments were carried out for the same composition in an argon atmosphere furnace. It was found that Ti B2-Ti C composite powder could be synthesized successfully at 550℃ by adding 10wt% PTFE into the initial reactant Ti-B mixture. The FESEM image showed that the average size of the product was smaller than 400 nm. According to differential thermal analysis results, the combustion synthesis mainly includes two reaction processes： firstly, the initial reaction between titanium and PTFE particles resulting in great amounts of heat release; subsequently, the released energy triggers the solid-state reaction between titanium and boron particles to form Ti B2.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2016年第3期324-328,共5页
Journal of Inorganic Materials
基金
Central University Basic Research and Operating Expenses of Special Funding(NP2012303)
