Synthesis of Al₈B₄C₇ ceramic powder from Al/B₄C/C mixtures

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• 作者：Yuanfei Gao ; Zhaohui Huang ; ^{huang118@cugb.edu.cn} ; Minghao Fang ; Yan-gai Liu ; Saifang Huang ; Xin Ouyang
• 关键词：Al8B4C7 ; Carbides ; Solid state reaction ; Phase transformations ; Electron microscopy ; X-ray diffraction
• 刊名：Powder Technology
• 出版年：2012
• 期刊代码：144_00325910
• 类别：et
• 出版时间：August, 2012
• 卷：226
• 期：Complete
• 页码：269-273
• 文件大小：839 K

摘要

Aluminium boron carbide (Al₈B₄C₇) ceramic powder was synthesized via a solid state reaction method using Al, B₄C and graphite powders as raw materials. The effects of synthesis temperature, carbon source (graphite and coke powder) and raw materials ratio on the phase transformation and micro-morphology of Al₈B₄C₇ were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the optimized process for preparing the Al₈B₄C₇ was 3 h sintering at 1600 掳C in flowing argon atmosphere. Graphite was more appropriate than coke powder and carbon black as carbon source for synthesizing pure Al₈B₄C₇, and 10 mol%excess of graphite resulted in higher purity of Al₈B₄C₇. The stoichiometric amount of aluminium was essential for obtaining pure Al₈B₄C₇, because second phase-Al₄C₃ would occur if excessive aluminium was used.