中华医学超声杂志

应用化学 ›› 2009, Vol. 26 ›› Issue (12): 1399-1403.

• 研究论文 • 上一篇    下一篇

液相渗硅法制备多孔Si/SiC生物形态陶瓷

罗民1*,李燕2,侯广亚3   

  1. (1.宁夏大学能源化工重点实验室 银川 750021;
    2.浙江医药高等专科学校宁波;3.浙江工业大学化学工程与材料学院杭州)
  • 收稿日期:2008-12-02 修回日期:2009-03-24 出版日期:2009-12-10 发布日期:2009-12-10
  • 通讯作者: 罗民，男，博士，副教授; E-mail:luominjy@nxu.edu.cn; 研究方向：多孔陶瓷及陶瓷基复合材料的设计和优化
  • 作者简介:罗民，男，博士，副教授；Ｅｍａｉｌ：ｌｕｏｍｉｎｊｙ＠ｎｘｕ．ｅｄｕ．ｃｎ；研究方向：多孔陶瓷及陶瓷基复合材料的设计和优化
  • 基金资助:
    国家重点基础研究发展计划“九七三”专项（2008CB617613）教育部科学技术研究重点（203143）教育部国家级大学生创新性实验(08L04)宁夏自然科学基金（NZ0916）资助项目

Manufacturing of wood derived biomorphic porous SiC ceramics by Liquid Silicon Infiltration processing

LUO Min1*, LI Yan2, HOU Guang-Ya3   

  1. (1.Key Laboratory of Energy Resources and Chemical Engineering,Ningxia University,Yinchuan 750021;
    2.Zhejiang Pharmaceutical College,Ningbo;
    3.College of Chemical Engineering and Materials Science,Zhejiang University of Technology,Hangzhou)
  • Received:2008-12-02 Revised:2009-03-24 Published:2009-12-10 Online:2009-12-10

PDF

3128

被引次数

3

摘要：

榉木经高温热解转化为碳模板，通过液相渗硅反应（LSIP），在1550℃，1.5h渗硅，1700℃排硅制备了保持木材微观结构的多孔Si/SiC陶瓷。利用X-射线衍射分析（XRD）, 扫描电子显微镜（SEM），压汞技术对样品的物相构成、显微结构和孔径分布进行了分析，利用阿基米德法和三点弯曲法测定了多孔陶瓷的显气孔率、密度和弯曲强度。结果表明，最终产物由主晶相β-SiC和少量的Si组成；控制高温排硅时间可以得到孔隙率为16％~32％的多孔Si/SiC陶瓷，可调控其产物的相组成和力学性能。对LSIP工艺的反应机理进行了探讨。

关键词: 多孔Si/SiC生态陶瓷, 液相渗硅－反应工艺, 微观结构, 力学性能

Abstract:

Biomorphic porous Si/SiC ceramics were prepared by liquid silicon infiltration-reaction and subsequent removing residual Si. The microstructure morphology and component analysis of the cellular Si/SiC were investigated by means of scanning electron microscope and X-ray diffraction. The porosity and distribution of pore diameter of porous Si/SiC were determined by mercury intrusion method. Results show that the resulting porous ceramic is composed of major crystal phase β－SiC and secondary phase residual free Si. The ceramic composite maintained the original morphology of the wood and exhibited a porosity of 16-32% by controlling the removing Si time. The Archimedes and three-point bending methods were used to test the apparent porosity and bending strength of porous SiC ceramic. The influence of the removing Si time on the final phase composition and mechanic properties of the formed biomorphic Si/SiC ceramic composites is analyzed. The formation mechanism of SiC was also discussed.

Key words: porous silicon carbide ceramics,biotemplating,liquid silicon infiltration processing(LSIP),microstructure,mechanical property

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