对氮化硅转化法制备碳化硅晶须的反应过程进行了热力学分析;采用氮化硅为硅源,石墨、活性炭和炭黑为碳源,氧化硼作为催化剂,利用氮化硅转化法分别在1500 ℃、1550 ℃、1600 ℃合成碳化硅晶须,通过X射线衍射和扫描电子显微镜分析合成晶须的特征.结果表明:合成反应在1450℃以上可以发生,且随着温度的升高,平衡常数急剧增加,SiC晶须直径变大;以活性炭和炭黑等较高活性的碳源代替石墨可以提高晶须的质量和生成量,通过对晶须合成过程的分析,推测晶须的生长属于螺旋位错生长机理.
参考文献
| [1] | Leu IC.;Hon MH.;Lu YM. .SUBSTRATE EFFECT ON THE PREPARATION OF SILICON CARBIDE WHISKERS BY CHEMICAL VAPOR DEPOSITION[J].Journal of Crystal Growth,1996(3/4):607-611. |
| [2] | Leu IC.;Hon MH.;Lu YM. .Factors determining the diameter of silicon carbide whiskers prepared by chemical vapor deposition[J].Materials Chemistry and Physics,1998(3):256-261. |
| [3] | Zhou D;Supapan S .Production of silicon carbide whiskers from carbon nanochister[J].Chemical Physics Letters,1994,222:233-238. |
| [4] | 韩伟强;范守善;李群庆 等.SiC纳米晶须生长和显微结构[J].材料研究学报,1998,12(03):335-336. |
| [5] | 韩伟强;范守善;李群庆 等.采用碳纳米管制备的碳化硅纳米晶须研究[J].无机材料学报,1997,12(06):774-778. |
| [6] | Li J B;Gang P .Synthesis of 2H-SiC whiskers by decomposition of Si3N4[J].Journal of the Ceramic Society of Japan,1989,97(08):879-880. |
| [7] | Li J B;Gang P;Chen S R et al.Formation and morphology of 2H-SiC whiskers by the decomposition of silicon nitride[J].Journal of the American Ceramic Society,73(04):919-922. |
| [8] | V. Raman;V. K. Parashar;O. P. Bahl .Influence of boric acid on the synthesis of silicon carbide whiskers from rice husks and polyacrylonitrile[J].Journal of Materials Science Letters,1997(15):1252-1254. |
| [9] | Raju C B;Verma S .SiC whiskers from rice hulls:Formation,purification,and characterization[J].British Ceramic Transactions,1997,96(03):112-115. |
| [10] | Krishnarao R V;Subrahmanyam J .Rapid heating of raw rice husks for the formation of SiC whiskers[J].Journal of Materials Synthesis and Processing,1996,4(05):285-289. |
| [11] | Selvam A.;Singh P.;Nair NG. .Synthesis and characterization of SiC whiskers from coconut shells[J].Journal of Materials Science Letters,1998(1):57-60. |
| [12] | 叶大伦.实用无机热力学手册[M].北京:冶金工业出版社,1981 |
| [13] | 王兆文.TiB2制取的热力学计算[J].矿冶工程,1998(04):54. |
| [14] | 罗谷风.结晶学导论[M].北京:地质出版社,1985:14-17. |
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