再结晶石墨的形成机制

吉林大学学报(工学版)

再结晶石墨的形成机制

臧传义¹，马红安^1,2，黄国锋²，贾晓鹏^1,2

1.河南理工大学材料学院，河南焦作 454000; 2.吉林大学超硬材料国家重点实验室，长春 130022

收稿日期:2006-09-22 修回日期:1900-01-01 出版日期:2007-09-01 发布日期:2007-09-01
通讯作者: 贾晓鹏

Formation mechanism of regrown graphite

Zang Chuan-yi¹，Ma Hong-an^1,2，Huang Guo-feng²，Jia Xiao-peng^1,2

1.Institute of Material Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 2.State Key Laboratory of Superhard of Materials, Jilin University, Changchun 130022, China

Received:2006-09-22 Revised:1900-01-01 Online:2007-09-01 Published:2007-09-01
Contact: Jia Xiao-peng

摘要/Abstract

摘要： 用高温高压温度梯度法作为实验手段来生长优质宝石级金刚石单晶。发现在金刚石合成的稳定区内（人造石墨碳源已完整为金刚石，而且籽晶上有宝石级金刚石单晶的持续生长），结晶性完整的亚稳态再结晶石墨更容易在相对低压高温区出现，其成核驱动力小于金刚石。本文还首次从过剩溶解度角度讨论了再结晶石墨的形成过程。研究表明：在金属触媒溶液中由高温端扩散下来的大量碳源处于过饱和状态时，再结晶石墨是作为一种中间相首先出现，当压力、温度合适时，再结晶石墨会再次成核为金刚石单晶，否则，再结晶石墨就会稳定保留下来。

关键词: 凝聚态物理学, 再结晶石墨, 温度梯度法, 金刚石, 过剩溶解度

Abstract: Large synthetic diamond was grown by temperature gradient method (TGM) under HPHT. It was found that, in the diamondstable region, where the manmade graphite has been completely transformed into diamond and the gem diamonds are continuously growing on the seed crystals, the regrown graphite is easier to appear at lower pressure and higher temperature. The driving force for the nucleation of regrown graphite is smaller than that for diamond crystals. The formation mechanism of regrown graphite is explained from the point of superconcentration of carbon (diamond or graphite) in the metal solvent. It is suggested that the regrown graphite appears as the transitional phase first. Then if the PT condition is suitable the regrown graphite will renucleate into diamond crystals. Otherwise, the regrown graphite will be retained stably.

Key words: condensed matter physics, regrown graphite, temperature gradient method, diamond, superconcentration

中图分类号:

O469

臧传义，马红安，黄国锋，贾晓鹏 . 再结晶石墨的形成机制[J]. 吉林大学学报(工学版), 2007, 37(05): 1097-1100.

Zang Chuan-yi，Ma Hong-an，Huang Guo-feng，Jia Xiao-peng . Formation mechanism of regrown graphite[J]. 吉林大学学报(工学版), 2007, 37(05): 1097-1100.

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