葡萄糖为碳源的SiC-TiC复合粉末合成工艺研究  

Synthesis of SiC-TiC Composite Powders Using Glucose as Carbon Source

作　　者：胡继林[1,2] 胡传跃[1] 郭文明[3] 王学成 田修营[1] 彭秧锡[1] 

机构地区：[1]湖南人文科技学院精细陶瓷与粉体材料湖南省重点实验室,娄底417000 [2]中南大学粉末冶金国家重点实验室,长沙410083 [3]湖南大学材料科学与工程学院,长沙410082 [4]山东省建筑科学研究院,济南250031

出　　处：《人工晶体学报》2017年第2期311-315,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51302076);湖南省科技计划项目(2016TP1028);湖南省教育厅科研重点项目(15A097)

摘　　要：以硅溶胶、葡萄糖和TiO_2为初始原料,采用碳热还原法在氩气气氛下合成SiC-TiC复合粉末。探讨了不同反应温度对SiC-TiC复合粉末的物相组成、粒径分布、显微形貌等方面的影响。采用X-射线衍射仪(XRD)、激光粒度分析仪、扫描电镜(SEM)等手段对所合成的SiC-TiC复合粉末进行表征。研究结果表明:SiC-TiC复合粉末适宜的合成条件为在1550℃保温2 h。在1550℃下合成的SiC-TiC复合粉末主要由少量的片状颗粒、一定量的晶须以及大量的近似球状颗粒构成。粉末样品中SiC晶须的生长机理遵循气-固(VS)机理。SiC-TiC composite powders were synthesized in argon atmosphere by a carbothermal reduction method using silica sol,glucose and TiO_2 as the raw materials. The effects of different reaction temperatures on phase composition,particle size distribution and microstructure of SiC-TiC composite powders were discussed. The synthesized powders were characterized by X-ray diffraction,laser particle size analyzer and scanning electron microscope. Results showed that the suitable conditions for synthesizing SiC-TiC composite powders were at 1550 ℃ for 2 h. The SiC-TiC composite powders synthesized at 1550 ℃ were composed of a small amount of flaky particles,a certain amount of whiskers and a large number of nearly spherical particles.The growth mechanism of SiC whiskers in powder samples followed the vapor-solid（VS） mechanism.

关 键 词：葡萄糖 SiC-TiC 复合粉末 合成 机理 

分 类 号：TQ174[化学工程—陶瓷工业]