溶胶凝胶、碳热/硼热还原法制备ZrB<sub>2</sub>-SiC-LaB<sub>6</sub>超细复相粉体

doi:10.19976/j.cnki.43-1448/TF.2023005

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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.

Key words： ZrB₂-SiC-LaB₆ sol-gel carbothermal/borothermal reduction ultrafine multiphase powders ultra-high temperature ceramics

Received: 19 January 2023 Published: 06 July 2023

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	ZHOU Zhe
	XIA Dawang
	LI Zhi
	LIAO Huanyi
	JIN Xin

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ZHOU Zhe,XIA Dawang,LI Zhi, et al. Preparation of ZrB₂-SiC-LaB₆ ultrafine multiphase powders by sol-gel and carbothermal/borothermal reduction[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(3): 223-232.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023005 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I3/223

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