超临界流体触媒作用下石墨-金刚石转变

吴奇; 孙力玲; 景勤; 曹新成; 王文魁

doi:10.11858/gywlxb.2002.01.001

超临界流体触媒作用下石墨-金刚石转变

doi: 10.11858/gywlxb.2002.01.001

1.
中国科学院物理研究所，北京 100080；
2.
燕山大学材料科学与化工学院，河北秦皇岛 066044；
3.
空军第二航空学院，吉林长春 130022

详细信息

通讯作者:
吴奇

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出版历程
- 收稿日期: 2001-11-02
- 修回日期: 2001-11-20
- 发布日期: 2002-03-05

Conversion of Graphite-to-Diamond Assisted by a Fluid Catalyst under High Pressure and High Temperature

1.
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China;
2.
College of Material Science and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China;
3.
Second Aeronautical Institute of Air Force, Changchun 130022, China

More Information

Corresponding author: WU Qi

摘要

摘要: 研究了超临界流体CO2在石墨-金刚石转变中的触媒作用。实验中，采用Ag2O作为流体触媒的先驱材料，在7.7 GPa压力下，Ag2O在1 200 ℃分解成Ag和O2，O2与石墨套管在高温高压下反应形成CO2超临界流体。研究结果表明，在7.7 GPa和1 500 ℃以上温度条件下，石墨在CO2流体触媒的作用下可转变为金刚石晶体，在1 500～1 700 ℃温度范围内合成出的金刚石具有完好的八面体形貌，与天然金刚石的生长特征非常相似。
- CO2超临界流体 /
- 石墨-金刚石相变 /
- 高温高压
Abstract: The catalyst role of supercritical fluid CO2 in the conversion of graphite-to-diamond at high pressure and high temperature has been confirmed experimentally. The complete transformation from graphite to diamond is achieved at 1 800～2 000 ℃ within 2～0.5 h under the pressure of 7.7 GPa. The change in temperature leads to morphology modification of the diamonds formed in the experiments: Diamonds with an irregular shape crystallize at 1 800～2 000 ℃ and the octahedral morphology crystallize at 1 500～1 700 ℃.
- supercritical fluid CO2 /
- graphite-diamond transformation /
- high pressure and high temperature

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参考文献(10)

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