LIU Jialiang,HAN Bingqiang,ZHANG Jinhua,CHEN Junfeng

(School of Materials and Metallurgy;The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology,Wuhan 430081,China)

Abstract:Using titanium dioxide (TiO₂),silicon powder (Si) and sodium metaborate (NaBO₂·4H₂O) as raw materials,ultra-high temperature ceramic titanium diboride powder (TiB₂) was prepared by molten salt assisted silicon thermal reduction method.The effects of the synthesis temperature and the addition of molten sodium silicate (Na₂SiO₃) on the reaction process were discussed.The removal effect of the by-product silicon dioxide (SiO₂) by hot water washing was studied and the microstructure of the target product TiB₂ powder was characterized.The results show that TiB₂ single crystal grains with high degree of crystallization can be obtained when the synthesis temperature is 1 100 ℃ and the holding time is 4 h.The TiB₂ particle size is about 400 nm and a few particles can reach 1 μm.Adding Na₂SiO₃ into the reaction system can reduce the viscosity of the liquid phase of the system,which is conducive to the absorption of SiO₂.By adjusting the modulus of sodium silicate,the by-products can be removed through the hot water washing method under atmospheric pressure,and the environmental pollution caused by pickling can be avoided.

Keywords:molten salt；silicon thermal reduction method；titanium diboride powder;sodium metaborate

中图分类号：TQ174.4                            文献标志码：A

文章编号：1008-5548(2022)04-0118-07

DOI:10.13732/j.issn.1008-5548.2022.04.013

收稿日期： 2022-01-08， 修回日期：2022-05-28，在线出版时间：2022-06-23。

基金项目：国家自然科学基金项目，编号：51802232。

第一作者简介：刘家良(1997—)，男，硕士研究生，研究方向为无机非金属粉体制备与表征。E-mail:tlmalcyone@outlook.com。

通信作者简介：韩兵强(1973—)，男，教授，博士，博士生导师，研究方向为耐火材料。E-mail:hbqref@wust.edu.cn。