Diamond micropowder synthesis via graphite etching in a microwave hydrogen plasma
Diamond micropowder synthesis via graphite etching in a microwave hydrogen plasma
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DOI：
10.1016/j.powtec.2017.09.021
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发表时间：
2017-12
影响因子：
5.2
通讯作者：
Kaili Yao;B. Dai;Jiaqi Zhu;V. Ralchenko;Shu Guoyang;Jiwen Zhao;Peng Wang;Liu Benjian;Gao Ge;Sun Ming-qi;Liu Kang;Zhijun Lv;Lei Yang;Jiecai Han
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文献类型：
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作者：
Kaili Yao;B. Dai;Jiaqi Zhu;V. Ralchenko;Shu Guoyang;Jiwen Zhao;Peng Wang;Liu Benjian;Gao Ge;Sun Ming-qi;Liu Kang;Zhijun Lv;Lei Yang;Jiecai Han
采用化学气相沉积法，在氢气微波等离子体中刻蚀石墨基片，在不添加碳氢(甲烷)气体的情况下合成了金刚石微粉。结果表明，石墨温度在70 0~10 0 0℃之间对金刚石的形核和生长有显著影响，随着温度的升高，金刚石颗粒的生长速率从2.4≈增加到4μm/h。在900℃的衬底温度下，金刚石粉末具有较好的结晶质量，因为沉积的磨粒与衬底的粘附性较低，易于收集和机械分解。用激光粒度分析仪测定了生长5小时的分散颗粒的平均尺寸≈为12μm，而用电子显微镜估计的最大颗粒尺寸在12≈至20μm之间变化。颗粒表面显示出许多尖端尖锐的微锥体，这有利于磨料应用。X射线衍射和拉曼光谱分析表明，合成的金刚石粉末纯度高，质量好。
Diamond micro powders have been synthesized by chemical vapor deposition via etching a graphite substrate in hydrogen microwave plasma, without a hydrocarbon (methane) gas addition. The graphite temperature, varying from 700 to 1000 °C, was found to significantly affect the diamond nucleation and growth, the growth rate of the diamond particles increasing from 2.4 to ≈ 4 μm/h with the temperature. The diamond powders had a better crystalline quality at the substrate temperature of 900 °C. Because of low adhesion of the deposited grit to the substrate the particles can be collected easily and mechanically disaggregated. The average size of ≈ 12 μm of the dispersed particles grown for 5 h, was determined with a laser particle size analyzer, while the maximum grain size estimated with electron microscopy, varied between 12 and ≈ 20 μm. The particle's surface exhibited many micro-pyramids with sharp tips, that could be beneficial for abrasive applications. X-ray diffraction and Raman spectroscopy revealed high purity and quality of the diamond powders.