分别以SiO2微粉和Si3N4为硅源，炭黑为碳源，氧化硼为催化剂，采用碳热还原法在1500℃氩气气氛下合成了SiC晶须。通过透射电镜和扫描电镜对所合成SiC晶须的形貌和晶体结构特征进行了分析。结果表明，采用两种硅源所合成的晶须均为B—SiC单晶，晶须的生长面为（111）面，生长方向为[111]方向。两种硅源所合成的晶须形貌特点存在较大差别，表明其合成SiC晶须的生长机理不同，VLS生长和螺旋位错的延伸生长可以分别用来解释以SiO2微粉为硅源和以Si3N4为硅源合成的晶须在形貌结构特征上的差别。
Using microsilica and Si3N4 as silicon sources, black carbon as carbon source, B2O3 as catalyst, SiC whiskers were synthesized under argon atmosphere at 1500℃ by carbothermal reduction method. Morphology and crystal structure of SiC whiskers were characterized by transmission electron microscope and scanning elec- tron microscope. The results show that the SiC whiskers synthesized lay using two kinds of silica sources are both/3-SIC single crystals, and the growth plane is （111） along the direction of [111]. The obvious differences in morphology indicate that there are different growth mechanisms of SiC whiskers synthesized by using differ- ent silica sources. VLS growth and screw dislocation growth are suitable to explain the differences in morpholo- gy of two kinds of SiC whiskers respectively.
参考文献
| [1] | Choi YooYoul;Kim Jun Gyu;Park Si Jung et al.[J].Journal of the Ceramic Society of Japan,2010,1383(118):1083-1086. |
| [2] | Chena Y F;Liu X Z;Deng X W .[J].Journal of Materi als Science& Technology,2010,26(11):1041-1046. |
| [3] | Kim Ik Whan;Choi Yoo Youl;Kim Jun Gyu et al.[J].Journal of Materials Science,2009,44(14):3819-3823. |
| [4] | Wang Kun;Cheng Yibing;Wang Huanting .[J].Journal of the Australian Ceramic Society,2009,45(01):10-12. |
| [5] | Wei Jian;Li Kezhi;Li Hejun et al.[J].Physica E:Low-dimensional Systems and Nanostructures,2009,41(08):1616-1620. |
| [6] | 翟蕊,杨光义,吴仁兵,陈建军,林晶,吴玲玲,潘颐.FeSi熔体中SiC晶须的VLS生长[J].复合材料学报,2007(05):97-102. |
| [7] | 吴艳军,张亚非,杨忠学,吴建生.碳纤维无催化剂法制备β-SiC纳米晶须[J].无机材料学报,2005(03):740-744. |
| [8] | Jia Xian;Ling Xiaomei .[J].Mineral Metallurgy Materials,2004,11(01):39-43. |
| [9] | 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. |
| [10] | 戴长虹,赵茹,水丽.电场电炉合成碳化硅晶须的研究[J].无机材料学报,2003(03):691-694. |
| [11] | 黄凤萍,李贺军,卢锦花,李克智,郭领军.碳纤维诱导法制备SiC晶须的工艺及机理[J].硅酸盐学报,2007(05):643-647. |
| [12] | 白晨,黄志明.铝锆碳质滑板中SiC晶须形成机理[J].钢铁研究,2007(03):8-11. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%