耐火材料 ›› 2026, Vol. 60 ›› Issue (1): 19-24.DOI: 10.3969/j.issn.1001-1935.2026.01.004

• 研究开发 • 上一篇    下一篇

微波辅助硼热/碳热合成TiB2粉体的保温时间作用机制研究

长世伦, 刘振阳, 王兴国, 李欣, 张照磊, 乔佳, 陈滨   

  1. 江苏大学 材料科学与工程学院 江苏镇江 212013
  • 收稿日期:2025-03-24 出版日期:2026-02-15 发布日期:2026-02-26
  • 通讯作者: 李欣,女,1991 年生,博士,讲师。E-mail:1000005148@ujs.edu.cn
  • 作者简介:长世伦:男,2000 年生,硕士研究生。E-mail:1320597097@qq.com
  • 基金资助:
    *热还原协同SPS烧结制备TiB2-Al2O3超高温复相陶瓷(江苏大学,X2025102990301)。

Action mechanism of insulation time in microwave-assisted borothermal/carbothermal synthesis of TiB2 powder

Chang Shilun, Liu Zhenyang, Wang Xingguo, Li Xin, Zhang Zhaolei, Qiao Jia, Chen Bin   

  1. First author’s address: School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China
  • Received:2025-03-24 Online:2026-02-15 Published:2026-02-26

摘要: 为阐明微波场中保温时间对二硼化钛(TiB2)粉体合成过程的调控机制,以TiO2-B4C-C体系为研究对象,采用微波辅助硼热/碳热耦合还原工艺,在1 450 ℃下系统探究保温时间(10、20、30和40 min)对产物物相组成、显微形貌及粒度分布的演变规律,从而揭示TiB2晶体的生长机制。结果表明:当保温时间为10 min时,体系存在TiO2和B4C的中间反应过程,导致存在TiC和B2O3副产物;保温时间延长至20 min,TiC、B2O3和C的反应完成,获得纯相TiB2粉体;保温时间超过30 min后,微波非热效应显著增强,诱发晶粒异常生长及烧结颈形成。较优工艺参数为1 450 ℃保温20 min,制备了d50为0.32 μm的亚微米TiB2粉体,其晶界清晰且呈规则六方结构。

关键词: TiB2粉体, 保温时间, 微波加热, 硼热/碳热还原法, 晶体生长

Abstract: To clarify the regulatory mechanism of the insulation time on the synthesis process of titanium diboride (TiB2) powder in microwave fields,this study took the TiO2-B4C-C system as the research object and adopted a microwave-assisted borothermal/carbothermal coupled reduction process to systematically investigate the evolution of the phase composition,morphology and particle size distribution of the products with different insulation time (10,20,30,and 40 min) at 1 450 ℃,thereby revealing the crystal growth mechanism of TiB2.The results show that:when the insulation time is 10 min,an intermediate reaction process involving TiO2 and B4C occurs in the system,resulting in the formation of byproducts TiC and B2O3;when the insulation time is extended to 20 min,the reactions of TiC,B2O3 and C complete,obtaining pure-phase TiB2 powder;when the insulation time exceeds 30 min,the microwave non-thermal effect is significantly enhanced,inducing abnormal grain growth and formation of sintering necks.The optimal process parameters are insulation at 1 450 ℃ for 20 min,obtaining submicron TiB2 powder with d50 of 0.32 μm,which has clear grain boundaries and regular hexagonal structures.

Key words: TiB2 powder, insulation time, microwave heating, borothermal/carbothermal reduction method, crystal growth

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