闫基森,刘凯旋,刘等卓,等.镁热自蔓延法制备SiC工艺与过程的研究[J].精密成形工程,2025,17(4):122-128.
YAN Jisen,LIU Kaixuan,LIU Dengzhuo,et al.Process and Procedure of SiC Preparation by Magnesiothermic Self-propagation Method[J].Journal of Netshape Forming Engineering,2025,17(4):122-128. |
| 镁热自蔓延法制备SiC工艺与过程的研究 |
| Process and Procedure of SiC Preparation by Magnesiothermic Self-propagation Method |
| 投稿时间：2024-10-14 |
| DOI：10.3969/j.issn.1674-6457.2025.04.012 |
| 中文关键词: SiC 镁热还原法 SiO2 碳源 葡萄糖 |
| 英文关键词: SiC magnesiothermic reduction SiO2 carbon source glucose |
| 基金项目:国家自然科学基金(52201044);河南省自然科学基金(252300421563);南阳市基础与前沿研究项目(24JCQY032);河南省高等学校重点科研项目(25B450001，25A460024，25B130003，24B460015);南阳理工学院大学生科研基金(2023-139) |
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| 中文摘要: |
| 目的 研究镁热自蔓延工艺制备SiC粉体过程中物相的演变规律以及有机碳源的反应机理。方法 采用镁热自蔓延合成法，以SiO2、Mg粉和葡萄糖(C6H12O6)为原料，探究镁粉和葡萄糖的添加量对制备SiC粉体的影响规律。结果 热力学分析结果表明，在C6H12O6-SiO2-Mg体系中，随着温度的升高，生成SiC反应的吉布斯自由能增大，同时体系内杂质含量上升，不利于SiC的合成。实验数据表明，Mg粉添加量的增加导致反应产物中Mg2Si相的衍射峰强度逐渐增强，而SiO2相的衍射峰强度减弱;葡萄糖添加量的增加则使Mg2Si相衍射峰强度减弱，SiC产物的收率呈现先增后减的趋势。经HF溶液酸洗处理后，产物为单相SiC。结论 在葡萄糖过量30%(质量分数)与镁粉过量80%(质量分数)的条件下，SiC的收率达到最优，为51.9%。通过Freeman-Carroll法对C6H12O6-SiO2-Mg体系的DSC曲线进行拟合分析，得出镁热自蔓延反应的活化能E=−103 168 kJ/mol，反应级数n=0.378 6。 |
| 英文摘要: |
| The work aims to study the evolution of phases and the reaction mechanism of organic carbon sources in the process of preparing SiC powder by the magnesiothermic self-propagation method. The impact of Mg powder and glucose addition on SiC powder preparation was investigated through the magnesiothermic self-propagation method with SiO2, Mg powder and glucose as the raw materials. Thermodynamic analyses demonstrated that in the C6H12O6-SiO2-Mg system, the Gibbs free energy of the SiC-generating reaction exhibited an increase with rising temperature, while the impurity content within the system demonstrated a corresponding rise. This was identified as an impediment to the effective synthesis of SiC. The experimental data indicated that the addition of Mg powder resulted in a gradual enhancement of the diffraction peak intensity of the Mg2Si phase in the reaction product, accompanied by a simultaneous weakening of the diffraction peak intensity of the SiO2 phase. Conversely, the addition of glucose led to a weakening of the diffraction peak intensity of the Mg2Si phase, accompanied by a tendency for the yield of the SiC product to initially increase and subsequently decrease. Following an acid washing treatment with an HF solution, the product was found to be single-phase SiC. In conclusion, the optimum yield of SiC is determined to be 51.9% under the aforementioned conditions of a 30% excess of glucose and an 80% excess of magnesium powder. The activation energy of the magnesium thermal self-propagation reaction, E=−103 168 kJ/mol, and the number of reaction stages, n=0.378 6, are obtained by applying the Freeman-Carroll method for the DSC curve fitting analysis of the C6H12O6-SiO2-Mg system. |
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