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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (7): 2491-2498.DOI: 10.16552/j.cnki.issn1001-1625.2026.0068

• 陶瓷及玻璃 • 上一篇    下一篇

Y2O3添加剂对熔盐法制备的Al2O3-SiC复合粉体及其陶瓷材料性能的影响

孙怡静(), 郑丽君(), 罗旭东, 高艺萌, 曲佳音   

  1. 辽宁科技大学材料与冶金学院,鞍山 114051
  • 收稿日期:2026-01-16 修订日期:2026-03-09 出版日期:2026-07-15 发布日期:2026-08-13
  • 通信作者: 郑丽君,博士,副教授。E-mail:lijunzheng@ustl.edu.cn
  • 作者简介:孙怡静(1997—),女,硕士研究生。主要从事复合陶瓷方面的研究。E-mail:2423180465@qq.com
  • 基金资助:
    国家自然科学基金联合基金资助项目(U20A20239);辽宁省教育厅基本科研项目(LJ212510146021)

Effect of Y2O3 Additive on Properties of Molten Salt-Assisted Synthesis of Al2O3-SiC Composite Powders and Resulting Ceramic Materials

SUN Yijing(), ZHENG Lijun(), LUO Xudong, GAO Yimeng, QU Jiayin   

  1. School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China
  • Received:2026-01-16 Revised:2026-03-09 Published:2026-07-15 Online:2026-08-13

摘要:

为了进一步探讨Al2O3-SiC复合陶瓷的制备工艺,以硅灰、Al粉和炭黑为原料,Y2O3为添加剂,NaCl和KCl为熔盐介质,通过熔盐法合成Al2O3-SiC复合粉体,系统研究了合成温度、Y2O3加入量对物相组成及显微结构的影响。结果表明,随着Y2O3添加量从0%增加到3%(质量分数)时,晶相以α-Al2O3β-SiC相为主,晶须长度为0.5~3.0 μm,直径为20~70 nm。SiC晶须合成机理表明,在合成过程中起主导作用的是气-固生长(V-S)机理,添加3%Y2O3的复合粉体采用无压烧结法在1 500 ℃保温4 h制备的Al2O3-SiC复合陶瓷材料的显气孔率为25.3%,体积密度为1.98 g·cm-3,耐压强度为16.4 MPa。

关键词: 熔盐, 复合粉体, Y2O3, SiC晶须, 气-固生长机理

Abstract:

To further investigate the preparation process of Al2O3-SiC composite ceramics, Al2O3-SiC composite powder was successfully synthesized via a molten-salt-assisted method using silica fume, aluminum powder, and carbon black as raw materials, Y2O3 as the additive, and NaCl and KCl as the molten salt medium. The effects of synthesis temperature and Y2O3 content on the phase composition and microstructure were investigated. The results show that the principal crystalline phases are α-Al2O3 and β-SiC. With Y2O3 content increasing from 0% to 3%(mass fraction), SiC whiskers are formed with lengths of 0.5 μm to 3.0 μm and diameters ranging from 20 nm to 70 nm. The growth mechanism study reveals that Y2O3 plays an important role in the formation of SiC whiskers, following a vapor-solid (V-S) growth mechanism. For the sample with 3%Y2O3 sintered at 1 500 ℃ for 4 h via pressureless sintering, the obtained Al2O3-SiC composite ceramic material exhibits a apparent porosity of 25.3%, a bulk density of 1.98 g·cm-3, and a compressive strength of 16.4 MPa.

Key words: molten salt, composite powder, Y2O3, SiC whisker, vapor-solid growth mechanism

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