期刊
POWDER TECHNOLOGY
卷 246, 期 -, 页码 247-251出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2013.04.055
关键词
Precursors; Grain size; Carbides; Nuclear applications
资金
- Department of Atomic Energy
A simple method was developed to synthesize boron carbide from a boric oxide-sucrose gel precursor. This gel precursor was prepared at 873 K. Upon heating under ultra high pure argon cover gas at 1773 K for 3 h, it was found to yield boron carbide. The precursor and the final product were both characterized by X-ray diffraction, chemical assay (for boron and carbon), scanning electron microscopy and particle size distribution. Conditions most suitable for the preparation of the precursor were optimized. A gel-pyrolysis procedure which gives a very high yield of boron carbide (similar to 60%) is reported for the first time in this study. The free residual carbon in the final product was lowered to 3.5%. Further this study clearly brings out the fact that the use of sucrose as a gel forming agent has definite advantages over the use of other carbon sources. (C) 2013 Elsevier B.V. All rights reserved.
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