以硅溶胶、葡萄糖和TiO2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2h.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 TiO2 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.
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