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溶胶凝胶法制备稳定ZrC溶胶体系
吴天昊, 孙文婷, 赵彦伟, 徐林, 李军平
航天材料及工艺研究所, 北京 100076
摘要:
以正丙醇锆为锆源、蔗糖为碳源制备ZrC溶胶体系,研究了溶剂中水含量对体系胶粒大小、凝胶时间、干凝胶碳热还原产物的物相及粒径大小的影响。同时也对加水之后形成干凝胶的碳热还原过程及碳锆摩尔比进行了详细探讨。结果表明:当C与Zr的摩尔比(记为C/Zr<sub>mol</sub>)为7、醋酸和水溶剂的体积比为5:1时,制备出室温下可稳定存在的ZrC前驱体溶胶,Zeta电位约为18.7 mV。此干凝胶在1 700℃下经碳热还原后可得到平均粒径约为240 nm的ZrC粉末。
关键词:  ZrC  溶胶凝胶法  凝胶时间
DOI:10.12044/j.issn.1007-2330.2018.02.009
分类号:TQ427
基金项目:
Preparation of Stable ZrC Sol by Sol-Gel Method
WU Tianhao, SUN Wenting, ZHAO Yanwei, XU Lin, LI Junping
Aerospace Research Institute of Materials & Processing Technology, Beijing 100076
Abstract:
Stable ZrC sol was prepared by sol-gel method using zirconium n-propoxide as zirconium source and sucrose as carbon source. Additionally, the effects of water content on micellar size, gelation time, phase composition and size of xerogel carbothermal reduction powder were also discussed in this paper. Meanwhile the carbothermal reduction process of xerogel with water content and C/Zr mole ratio were also studied. The results show that when C/Zr mole ratio is 7 and the volume ratio between acetic acid and water is 5, stable ZrC precursor can be prepared at room temperature, and the Zeta potential is about 18.7mV. The ZrC powder obtained by carbothermal reduction at 1700℃ has an average size of 240nm.
Key words:  ZrC  Sol-gel method  Gelation time