Recrystallization behaviour of cubic boron nitride under high pressure |
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| Affiliation: | 1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, PR China;2. Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu, 610065, PR China;3. Chongqing Key Laboratory of Extraordinary Bond Engineering and Advance Materials Technology (EBEAM), School of Materials Science and Engineering, Yangtze Normal University, Chongqing, 408100, PR China;4. School of Science, Southwest University of Science and Technology, Mianyang, 621010, PR China |
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| Abstract: | The recrystallization behaviour of micron-sized cubic boron nitride (cBN) was studied by analysing the grain size and morphology of samples treated at 8−16 GPa/1500–2200 °C. The results show that the recrystallization temperature of cBN under a pressure of 8 GPa is approximately 1650 °C and increases by approximately 100 °C with every 2 GPa increase in pressure. Once grain recrystallization starts, the grains grow abnormally quickly as the temperature rises, and the strengthening effects of grain refinement and defect structure are greatly weakened. The recrystallization behaviour of cBN at high pressure is helpful to understand the sintering mechanism and control the microstructure and mechanical properties of sintered polycrystalline cBN compacts. In addition, the melting curve for cBN under high pressure is inferred according to the empirical relationship between recrystallization temperature and melting temperature, and the phase diagram for boron nitride is revised based on this new melting curve. |
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| Keywords: | High pressure Cubic boron nitride Recrystallization Microstructure Mechanical properties |
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