J. Mater. Sci. Technol. ›› 2010, Vol. 26 ›› Issue (5): 449-453.

• Research Articles • 上一篇    下一篇

多孔Si3N4-Lu2Si2O7复相陶瓷的制备

张鹏飞1,张立同2,殷小玮1   

  1. 1. 超高温结构复合材料国防重点实验室
    2.
  • 收稿日期:2009-05-13 修回日期:2009-12-29 出版日期:2010-05-31 发布日期:2010-06-01
  • 通讯作者: 张鹏飞
  • 基金资助:

    西北工业大学基础研究基金

Fabrication of Porous Si3N4-Lu2Si2O7 Composite Ceramics

Pengfei Zhang, Litong Zhang, Xiaowei Yin   

  • Received:2009-05-13 Revised:2009-12-29 Online:2010-05-31 Published:2010-06-01
  • Contact: Pengfei-Fei ZHANG
  • Supported by:

    the "Basic Research Fund" of Northwestern Polytechnical University, China (No. W018105)
    the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University, China (No. KB200920)

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摘要：

通过氧化和无压烧结技术在N2中低于1550oC制备一种多孔Si3N4-Lu2Si2O7复相陶瓷，据此来提高多孔Si3N4陶瓷在含有水蒸气和挥发性物质的高温环境中的抗腐蚀能力。通过除去造孔剂（酚醛树脂）在陶瓷内部形成孔隙。在空气中1250oC氧化Si3N4生成的SiO2和Lu2O3在各个烧结温度下反应，形成了具有优秀抗氧化与抗腐蚀能力的Lu2Si2O7。多孔陶瓷的相成分，微结构和力学性能与烧结温度有关。含有4wt.%Lu2O3添加剂的Si3N4在1250oC氧化1小时再在1550oC烧结2小时可以制得孔隙率52%、孔径在0.2μm的Si3N4-Lu2Si2O7复相陶瓷。

关键词: 多孔陶瓷, 氮化硅, 焦硅酸镥, 无压烧结

Abstract:

To improve the corrosion resistance of porous Si3N4 used in the high temperature environments, which contain water vapor and volatile species, porous Si3N4-Lu2Si2O7 composite ceramics were fabricated by a process of oxidation bonding and pressureless sintering in flowing N2 atmosphere at the temperatures lower than 1550°C. The pores in ceramics were formed by removing the pore-forming agent (phenolic resin). SiO2 derived by the oxidation of Si3N4 at 1250°C in air reacted with Lu2O3 at various sintering temperatures, leading to the formation of Lu2Si2O7 with excellent oxidation and corrosion resistance. The phase composition, microstructure, and mechanical properties of the porous ceramics depended on the sintering temperatures. Si3N4-Lu2Si2O7 composite ceramics with the porosity of 52% and the pore size of 0.2μm were obtained by oxidation bonding at 1250°C for 1 h and pressureless sintering at 1550°C for 2 h using 4 wt pct Lu2O3 additive.

Key words: Porous ceramics, Silicon nitride, Lu2Si2O7, Pressureless sintering