高压物理学报2024，Vol.38Issue(4)：54-62,9.DOI:10.11858/gywlxb.20240715
压力环境对纳米晶金刚石石墨化的影响
Effect of Pressure Environment on Graphitization of Nano-Crystalline Diamond
摘要
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 600-1500℃,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℃at 5 GPa,and ranges between 1000 and 1300℃at 9 GPa.Notably,under quasi-hydrostatic pressure conditions at about 7 GPa,the graphitization temperature of NCD increases from 1000℃in non-hydrostatic pressure conditions to 1500℃or higher within a short holding time.关键词
纳米金刚石/高温高压/石墨化/准静水压/非静水压Key words
nano-diamond/high temperature and high pressure/graphitization/quasi-hydrostatic pressure/non-hydrostatic pressure分类
数理科学引用本文复制引用
于少楠,王文丹,何强,杨雨滔,唐名轩,马小娟,李星翰..压力环境对纳米晶金刚石石墨化的影响[J].高压物理学报,2024,38(4):54-62,9.基金项目
国家自然科学基金(41674008,11902276) （41674008,11902276）
四川省自然科学基金(2022NSFSC0340,2022NSFSC1802) （2022NSFSC0340,2022NSFSC1802）
西南交通大学原创性科研仪器设备研制项目(XJ2021KJZK052,2682023ZTPY009) （XJ2021KJZK052,2682023ZTPY009）
