Experimental Study on the Polycrystal Diamond Synthesis from Graphite by Multiple Shock-Compressions
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摘要: 利用高能炸药爆轰产物驱动金属飞片，碰撞硬回收包套以输入平面冲击波，在24~37 GPa的压力范围内，对纯石墨进行1~4次的冲击压缩实验，合成出了纯度很高、形貌良好的立方型聚晶金刚石。随着冲击次数的增加，金刚石的转化率和粒度有增大的趋势。但是，当金刚石粒度较大时（约100 m以上），如果冲击温度较低（约1 000 K以下），同时冲击压力又较高（约20 GPa以上），金刚石颗粒就容易被冲击波破碎。Abstract: Pure graphite powders were subjected to single to fourfold shock-compressions by use of an explosively driven metal flyer impacting onto the recovery capsule, and polycrystal cubic diamond of high purity and with regular morphology was synthesized from the graphite under pressures from 24 to 37 GPa. Conversion ratio from graphite and particle size of diamond displayed an increased trend with the compression times. When the particle size of diamond is greater than about 100 m, however, it is easily to be fractured if the shock pressure is high (over 20 GPa) while the temperature is low (below 1 000 K).
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Key words:
- shock wave /
- diamond synthesis /
- high-pressure
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吉林大学固体物理教研室高压合成组编. 人造金刚石. 第一版. 长春: 科学出版社, 1975: 7-8. 邵丙璜, 周之洪, 汪金通, 等. 爆炸与冲击, 1986, 6: 198. 芍清泉, 吉林大学学报, 1973, (3): 5. 田中宗, 上田先, 驹田英治, 等. 武汉钢铁学院科技资料室编译, 爆炸合成金刚石, 内部资料. Decarli P S. In: Timmerhaus K D, Barber M S, ed. Proceedings of 6th AIRAPT Conference on High Pressure Science and Technology. New York: Plenum Press, 1979, 1: 940. Ahrens T J, potter D K. 私人通讯, 1987. Burgcmeistcr E A, Rosenberg H M. J Mat Sci, 1980, 16: 1730. Jurgen W K, Pkman N J. Diamond Purification. US Patent 3348918, 1966. -
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