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- Title
Effect of Pressure Environment on Graphitization of Nano-Crystalline Diamond.
- Authors
YU Shaonan; WANG Wendan; HE Qiang; YANG Yutao; TANG Mingxuan; MA Xiaojuan; LI Xinghan
- Abstract
The graphitization process of nano-crystalline diamond (NCD) under high pressure significantly influences the performance of sintered polycrystalline diamond bulks. Here, we investigated the graphitization temperature of both pure nano-diamond, with an average grain size of 50 nm, and a mixture of NaCl and nano-diamond powder in a pressure and temperature range of 5-9 GPa and 600-1 500 °C, respectively. With a quantitative analysis method employing powder X-ray diffraction, we analyzed the graphitization degree of NCD under different pressures and temperatures, examining both non-hydrostatic pressure conditions (pure NCD powder) and quasi-hydrostatic pressure conditions (NaCl-NCD mixed powder). Our findings indicate that the initial graphitization temperature of pure NCD powder exceeds 800 °C at 5 GPa, and ranges between 1 000 and 1 300 °C at 9 GPa. Notably, under quasi-hydrostatic pressure conditions at about 7 GPa, the graphitization temperature of NCD increases from 1 000 °C in non-hydrostatic pressure conditions to 1 500 °C or higher within a short holding time.
- Subjects
X-ray powder diffraction; HIGH temperatures; GRAIN size; DIAMONDS; QUANTITATIVE research
- Publication
Chinese Journal of High Pressure Physics, 2024, Vol 38, Issue 4, p1
- ISSN
1000-5773
- Publication type
Article
- DOI
10.11858/gywlxb.20240715