以淀粉为碳源,正硅酸乙酯(TEOS)为硅源,通过溶胶-凝胶法制备了碳化硅前驱体淀粉-SiO_2凝胶,将干凝胶在氩气氛中进行碳热还原制备碳化硅(SiC).用XRD、IR、SEM、TEM及N_2低温物理吸附等手段对合成的样品进行表征.结果表明,在淀粉-SiO2凝胶中添加镍催化剂在1450℃下就能合成出尺寸大小为40～60nm多孔高比表面积的纳米SiC,其孔径主要集中在4.2和10.6nm,比表面积为127.5m~2/g,孔体积为0.43cm~3/g.
The precursor of silicon carbide (SiC) was obtained by sol-gel methods in which used tetraethoxysilane as silicon source and starch as carbon source, and then the oxalic acid and nickel nitrate were added respectively as catalyst for hydrolysis and polymeration reactions. The obtained precursor was used to prepare SiC by carbothermal reduction in the Ar flow. The samples were characterized by X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscope, transmission electron microscope, and low-temperature nitrogen adsorption-desorption measurement. The results showed that the carbothermal temperature for synthesizing SiC needed to be at 1450℃ when the nickel nitrate was employed in the precursor. At this temperature, the obtained sample is composed of agglomerated regular grains with size ranging from 40-60nm and has a high specific surface area of 127. 5m~2/g and the main pore diametre size center at 4. 2 and 10. 6nm.
参考文献
| [1] | Lyckfeldt O;Ferreirab J M F .[J].Journal of the European Ceramic Society,1998,18:131-140. |
| [2] | Gregorova E;Pabst W .[J].Ceramics International,2007,33:1385-1388. |
| [3] | Mao X J;Wang S W;Shimai S et al.[J].CERAMICS INTERNATIONAL,2008,34:107-112. |
| [4] | Alves HM.;Fonseca AT.;Ferreira JMF.;Tari G. .Processing of porous cordierite bodies by starch consolidation[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,1998(10):1439-1448. |
| [5] | Park K H;Sung I K;Kim D P .[J].Journal of Materials Chemistry,2004,14:3436-3439. |
| [6] | Ledoux M J;Hantzer S;Pham-Huu C et al.[J].Journal of Catalysis,1988,114:176-185. |
| [7] | Shin Y;Liu J;Chang J H et al.[J].Advanced Materials,2001,13:728-732. |
| [8] | Zheng Y;Lin L X;Lin L X et al.[J].Scripta Materialia,2006,55:883-886. |
| [9] | Hao Y J;Jin G Q;Han X D et al.[J].Materials Letters,2006,60:1334-1337. |
| [10] | 武七德,鄢永高,郭兵健,李美娟,刘小磐.以淀粉为填充剂的碳坯渗硅制备反应烧结碳化硅陶瓷[J].无机材料学报,2004(02):302-306. |
| [11] | Pan S L;Zhang J;Yang Y F et al.[J].CERAMICS INTERNATIONAL,2008,34:391-395. |
| [12] | Pujar VV.;Cawley JD. .EFFECT OF STACKING FAULTS ON THE X-RAY DIFFRACTION PROFILES OF BETA-SIC POWDERS[J].Journal of the American Ceramic Society,1995(3):774-782. |
| [13] | Guterl C V;Ehrburger P .[J].CARBON,1997,35:1587-1592. |
| [14] | Guo X Y;Jin G Q .[J].Journal of Materials Science Letters,2005,40:1301-1303. |
| [15] | Jin G Q;Guo X Y .[J].Microporous and Mesoporous Materials,2003,60:207-212. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%