微量NaN3掺杂对宝石级金刚石合成的影响  

Influence of NaN_3 additive on growth of large synthetic diamond crystals

作　　者：臧传义[1] 马红安[1] 胡强[1] 张亚飞[2] 贾晓鹏[1] 

机构地区：[1]河南理工大学材料与科学工程学院,焦作454000 [2]吉林大学超硬材料国家重点实验室,长春130012

出　　处：《金刚石与磨料磨具工程》2008年第3期35-38,共4页Diamond & Abrasives Engineering

基　　金：河南理工大学博士科研启动基金资助项目

摘　　要：利用温度梯度法生长宝石级金刚石单晶过程中,在碳源或者触媒体系中进行微量掺杂,会显著改变晶体生长性质。本研究在NiMnCo-C体系中掺杂微量NaN3,发现体系中微量NaN3的存在,不仅仅会影响到晶体中的氮含量,对晶体生长过程也存在明显的影响。当体系中NaN3分布不均时,单晶生长遭到严重破坏,籽晶没有起到引导晶体生长作用,晶体呈现不规则的凌乱生长状态,以条柱状和片层状生长为主;当体系中微量NaN3分布均一时,晶体生长变得规则,可以得到晶型完整的单晶金刚石。但随着NaN3含量增加,超过碳源重量比例的0.4wt%时,晶体生长过程受到严重抑制,高氮含量宝石级金刚石单晶的持续生长很难维持下去,这同样证明了较多NaN3存在时的杂乱晶体生长,是由于体系中NaN3局部位置含量差别较大造成的。During the growing of large synthetic diamond crystals by temperature gradient method under HPHT, if some additives are introduced into carbon source or metal solvent, the crystal characters could be changed markedly. In this article, when some NaN3 powder was added into NiMnCo - C system, not only the nitrogen content in diamond crystals was changed, but the growth process was influenced markedly. When inhomogeneous distribution of NaN3 additive was present in carbon source, the growth of large diamond single crystals was destroyed, and the crystals, although grown on seed crystals, showed disorder and irregular growth characters, mostly with column - like and plate - like morphology. When homogeneous distribution of NaN3 additive was introduced into carbon source, single crystals grew orderly with complete and regular morphology. However, when the additive content of NaN3 with homogeneous distribution increased to 0.4wt%, or more, the crystal growth was checked greatly, and with a very low growth rate, the growth of large single crystals of high -nitrogen content became difficult to continue. And it is also concluded that, due to great difference of NaN3 content in different parts of growth system, disorder growth of diamond crystals would take place easily.

关 键 词：温度梯度法 掺杂 宝石级金刚石 单晶 

分 类 号：TQ164[化学工程—高温制品工业]