高温高压合成立方氮化硼的热力学分析

吉晓瑞; 杨大鹏; 杨晓红; 张铁臣; 

doi:10.11858/gywlxb.2009.06.011

高温高压合成立方氮化硼的热力学分析

doi: 10.11858/gywlxb.2009.06.011

1.
沈阳工程学院基础教学部，辽宁沈阳 110136；
2.
吉林大学仪器科学与电气工程学院，吉林长春 130026；
3.
长春理工大学光电信息学院，吉林长春 130024；
4.
吉林大学超硬材料国家重点实验室，吉林长春 130012

详细信息

通讯作者:
吉晓瑞

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出版历程
- 收稿日期: 2008-07-09
- 修回日期: 2009-09-07
- 发布日期: 2009-12-15

Thermodynamic Analysis of Cubic Boron Nitride Synthesized under HPHT

1.
Department of Preparatory Course, Shenyang Institute of Engineering, Shenyang 110136, China;
2.
College of Instrumentation & Electrical Engineering, Jilin University, Changchun 130026, China;
3.
College of Optical and Electronical Information, Changchun University of Science and Technology, Changchun 130024, China;
4.
National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China

More Information

Corresponding author: JI Xiao-Rui

摘要

摘要: 从热力学角度计算出了以六角氮化硼为原料、用高压触媒法合成立方氮化硼时所形成稳定的临界晶粒半径rk的大小，当p=6.0 GPa、T=1 600 ℃时，rk15 nm。分析了rk的大小与合成温度、压力的关系，以及在给定压力下立方氮化硼晶粒转化率与温度的关系。结果表明：在立方氮化硼稳定区，在相同压力下，rk随温度的升高而增大；在相同温度下，rk随压力的升高而减小，rk越小立方氮化硼晶粒的转化率越高。计算结果与实际合成实验所得结果完全一致。
- 合成条件 /
- 影响 /
- 临界晶粒尺寸 /
- 转化率
Abstract: We analyzed the relationships between growth condition and phase transition probability, and critical crystal radius respectively by thermodynamics. Then we calculated the critical grain radius rk for forming cBN crystal under high pressure and high temperature (HPHT). Under 6.0 GPa, 1 600 ℃, the rk is around 15 nm. In the thermodynamically stable region of cBN, the results show that under the same pressure, rk is increasing with the elevated temperature; under the same temperature, rk is decreasing with increasing pressure, and the smaller rk is, the higher phase transition probability is. These results are well consistent with experimental data.
- synthesis condition /
- effect /
- critical crystal radius /
- transition probability

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参考文献(13)

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