J. Mater. Sci. Technol. ›› 2009, Vol. 25 ›› Issue (03): 401-404.

• Letters • 上一篇    下一篇

燃烧合成非化学计量比β-SiC粉体的制备和介电性能Preparation and dielectric properties of nonstoichiometric β-SiC powder by combustion synthesis

苏晓磊1;2;周万城2;李智敏2;罗发2;朱冬梅2   

  1. 1. 西安工程大学
    2. 西北工业大学
  • 收稿日期:2008-03-28 修回日期:2008-11-04 出版日期:2009-05-28 发布日期:2009-10-10
  • 通讯作者: 苏晓磊
  • 基金资助:

    50572090;国家自然科学基金;50572090;国家自然科学基金

βPreparation and Dielectric Properties of Nonstoichiometric β-SiC Powder by Combustion Synthesis

Xiaolei Su1,2)†, Wancheng Zhou1), Zhimin Li3) , Fa Luo1) and Dongmei Zhu1)   

  1. 1) State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi0an 710072 China
    2) College of Mechanical & Electronic Engineering, Xi0an Polytechnic University, Xi0an 710048, China
    3) School of Technical Physics, Xidian University, Xi0an 710071, China
  • Received:2008-03-28 Revised:2008-11-04 Online:2009-05-28 Published:2009-10-10
  • Contact: Su XiaoLei
  • Supported by:

    the National Natural Science Foundation of China under grant No. 50572090 and the fund of the Slate Key Laboratory of Solidification
    Processing in NWPU, No. KP200901.

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关键词: β-SiC粉体;燃烧合成;碳反位;介电性能

Abstract:

The nonstoichiometric β-SiC powders were synthesized via combustion reaction of Si and C system in a 0.1 MPa nitrogen atmosphere, using Teflon as the chemical activator. The prepared powders were invistigated by XRD and Raman spectra. The results indicates that the cell parameters of all the prepared β-SiC powder
are smaller than the standard value of β-SiC because of generation of CSi defects. The complex permittivity of prepared products was carried out in the frequency range of 8.2−12.4 GHz. It shows that the dielectric property of prepared β-SiC powder decrease with increasing PTFE content. The effect of CSi defects on dielectric property of -SiC powder has been discussed.

Key words: Silicon carbide, Carbon antisite, Dielectric property