Preparation of ZrB2-ZrO2-SiC Composite Powder by Carbothermal Reduction from Zircon

doi:10.19691/j.cnki.1004-4493.2023.01.005

China's Refractories ›› 2023, Vol. 32 ›› Issue (1): 25-29.DOI: 10.19691/j.cnki.1004-4493.2023.01.005

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Preparation of ZrB₂-ZrO₂-SiC Composite Powder by Carbothermal Reduction from Zircon

TIAN Xuekun¹, ZHOU Chaojie^1,2, ZHANG Lei^1,3, ZHAO Fei¹, JIA Quanli¹, LIU Xinhong^1,*, ZHONG Xiangchong¹

1 Henan Key Laboratory of High Temperature Functional Ceramics, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China;
2 Henan Institute of Product Quality Supervision and Inspection, Zhengzhou 450004, China;
3 TRB (Beijing) Trading Co., Ltd., Beijing 100010, China

Online:2023-03-15 Published:2023-03-22
Contact: *e-mail: liuxinhong@zzu.edu.cn
About author:Tian Xuekun, born in 1995, obtained his bachelor's degree and master's degree from the School of Materials Science and Engineering of Zhengzhou University. From 2019 to 2021, he worked in Chinalco Zhengzhou Nonferrous Metals Research Institute Co., Ltd. Now he is pursuing his doctor's degree in School of Materials Science and Engineering, Zhengzhou University, mainly engaging in the research of new ceramic raw materials, oxide-non-oxide composite materials, and new carbon composite materials. He has published 7 academic papers as the first author.

Abstract

Abstract: Using zircon, boric acid and carbon black as starting materials, ZrB₂-ZrO₂-SiC composite powder was synthesized by calcining at 1 500 ℃ in flowing argon atmosphere. The effects of the soaking time (3, 6 and 9 h) and the addition of additive AlF₃ (0, 0.5%, 1.0%, 1.5%, 2.0% and 2.5%, by mass) on the phase composition and the microstructure of the synthesized products were investigated. The results show that: (1) ZrB₂-ZrO₂-SiC composite powder can be synthesized by carbothermal reduction at 1 500 ℃ in flowing argon atmosphere; ZrB₂ and ZrO₂ are granular-like, and SiC crystals are fiberous; (2) with the soaking time increasing, the amount of ZrB₂ increases, the amounts of m-ZrO₂ and SiC decrease, and the total amount of non-oxides ZrB₂, SiC and ZrC gradually increases; the optimal soaking time is 3 h; (3) compared with the sample without AlF₃, the sample with 0.5% AlF₃has decreased m-ZrO₂ amount, noticeably increased ZrB₂ amount but decreased SiC amount; however, when the addition of AlF₃ increases from 0.5% to 2.5%, the m-ZrO₂ amount increases, the ZrB₂ amount decreases, and the SiC amount changes slightly; the optimum AlF₃ addition is 0.5%.

Key words: zircon, carbothermal reduction, zirconium diboride-zirconia-silicon carbide composite powder

TIAN Xuekun, ZHOU Chaojie, ZHANG Lei, ZHAO Fei, JIA Quanli, LIU Xinhong, ZHONG Xiangchong. Preparation of ZrB₂-ZrO₂-SiC Composite Powder by Carbothermal Reduction from Zircon[J]. China's Refractories, 2023, 32(1): 25-29.

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Preparation of ZrB₂-ZrO₂-SiC Composite Powder by Carbothermal Reduction from Zircon

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