Preparation of ZrB2-SiC-LaB6 ultrafine multiphase powders by sol-gel and carbothermal/borothermal reduction
ZHOU Zhe1, XIA Dawang2, LI Zhi2, LIAO Huanyi1, JIN Xin1
1. School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China; 2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China
Abstract：ZrB2-SiC-LaB6 ultrafine multiphase powders were prepared by the way of sol-gel method and carbothermal/borothermal reduction process, using zirconium oxychloride (ZrOCl2·8H2O), boric acid (H3BO3), hydrated lanthanum chloride (LaCl3·7H2O), ethyl orthoate (TESO), and glucose (C6H12O6) as the main raw materials, polyethylene glycol (PEG) as the dispersant. The effects of different temperatures and raw material ratios on the synthesis process of composite powders were studied and characterized by X-ray diffraction, SEM, infrared spectroscopy, and differential thermal scanning. The results show that when n(Zr)∶n(B)∶n(Si)∶n(La)∶n(C) =1∶3∶0.7∶0.16∶8 in the raw material, ZrB2-SiC-LaB6 superfine multiphase powders can be synthesized by holding at 1 500 ℃ for 2 h under argon atmosphere. The average particle size of multiphase powder is 300 nm, in which ZrB2 phase is hexagonal crystal system, SiC and LaB6 phase are cubic system, and the average size of ternary crystallite is 33.2 nm.
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2023, Vol. 28 
