耐火材料 ›› 2022, Vol. 56 ›› Issue (1): 20-23.DOI: 10.3969/j.issn.1001-1935.2022.01.005

• 研究开发 • 上一篇    下一篇

锆英石碳热还原制备ZrB2-ZrO2-SiC复合粉体

周超杰1,2)(), 张磊1,3), 赵飞1), 贾全利1), 刘新红1)(), 钟香崇1)   

  1. 1)河南省高温功能材料重点实验室 郑州大学材料科学与工程学院 河南郑州 450052
    2)河南省产品质量监督检验院 河南郑州 450004
    3)TRB(北京)贸易有限公司 北京 100010
  • 收稿日期:2021-04-28 出版日期:2022-02-15 发布日期:2022-02-15
  • 通讯作者: 刘新红,女,1973年生,博士,教授。E-mail:liuxinhong@zzu.edu.cn
  • 作者简介:周超杰:女,1986年生,硕士,工程师。E-mail: 358983277@qq.com
  • 基金资助:
    国家自然科学基金资助项目(51872266);国家自然科学基金资助项目(51672253)

Preparation of ZrB2-ZrO2-SiC composite powder using zircon by carbothermal reduction method

Zhou Chao-jie1,2)(), Zhang Lei1,3), Zhao Fei1), Jia Quanli1), Liu Xinhong1)(), Zhong Xiangchong1)   

  1. 1)Henan Key Laboratory of High Temperature Ceramics,School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450052,Henan,China
  • Received:2021-04-28 Online:2022-02-15 Published:2022-02-15
  • Contact: Liu Xinhong

摘要:

以锆英石、硼酸和炭黑为原料,在流通氩气气氛中于1 500 ℃煅烧制备ZrB2-ZrO2-SiC复合粉体,研究了保温时间(分别为3、6和9 h)和添加剂AlF3添加量(质量分数分别为0、0.5%、1.0%、1.5%、2.0%和 2.5%)对合成产物物相组成和显微结构的影响。结果表明:1)将锆英石在流通氩气气氛中于1 500 ℃碳热还原可制备ZrB2-ZrO2-SiC复合粉体;ZrB2、ZrO2呈粒状,SiC呈纤维状。2)随着保温时间的延长,ZrB2的量逐渐增多,m-ZrO2和SiC的量均逐渐减少,非氧化物ZrB2、SiC、ZrC的总量逐渐增多。3)与未添加AlF3的试样相比,添加0.5%(w)AlF3的试样中m-ZrO2量显著减少,ZrB2的量显著增多,SiC的量有所减少;但随着AlF3添加量从0.5%(w)增加到2.5%(w),m-ZrO2的量逐渐增多,ZrB2的量逐渐减少,SiC的量变化不大;AlF3的适宜添加量应为0.5%(w)。

关键词: 锆英石, 碳热还原, ZrB2-ZrO2-SiC复合粉体, 显微结构

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;(3)compared with the specimen without AlF3,the specimen with 0.5% AlF3 has decreased m-ZrO2 amount,noticeably increased ZrB2 amount but decreased SiC amount;however,when the amount 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, microstructure

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