优质克拉级Ib型金刚石单晶的高温高压合成及应用研究  

Synthesis and applications of high quality type-Ib diamond single crystals in carats grade

作　　者：肖宏宇[1] 张东梅[1] 臧春和[1] 唐春娟[1] 苏剑锋[1] 刘利娜[1] 马红安[2] 贾晓鹏[2] 

机构地区：[1]洛阳理工学院数理部,河南洛阳471023 [2]吉林大学超硬材料国家重点实验室,吉林长春130012

出　　处：《功能材料》2011年第S4期670-673,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50572032);洛阳理工学院博士科研启动基金资助项目(2010BZ02)

摘　　要：利用温度梯度法,在国产六面顶压机上进行优质克拉级Ib型金刚石单晶的高温高压合成及应用研究。通过合理设计实验组装,优化生长工艺,严格控制生长速度等成功合成出了多颗优质克拉级金刚石单晶。借助扫描电子显微镜(SEM)对克拉级金刚石单晶的表面缺陷进行了测试分析。考察了生长速度对晶体品质的影响。同时,对优质克拉级大单晶在饰品钻石行业的应用问题进行了系统地研究。结果表明,优质高温塔状克拉级金刚石单晶对生长条件的要求极为苛刻。晶体表面缺陷的出现,与碳素扩散场不合理、生长速度过快和合成温度过高等因素有关。过快的生长速度还会导致较多金属包裹体在晶体中出现或合成的晶体为群晶。根据毛坯金刚石的形貌对成品钻石的形状进行选择性加工,得到了多颗方形、圆形和椭圆形饰品钻石,减少了晶体的磨削量,大大降低了钻石的加工成本。In the paper,the synthesis and application of high quality type-Ib diamond single crystals in carats grade were studied by temperature gradient method(TGM) under a China made cubic anvil apparatus which produces high temperature and high pressure.By designing sample assembly,optimizing growth process and controlling growth speed,plenty of high quality type-Ib diamond single crystals in carats grade were synthesized successfully.The surface defects of synthetic diamond crystals were observed with scanning electron microscope(SEM).The effects of growth speed on crystal quality were researched,and the application problems of high quality diamond crystals in carats grade as jewels in diamond industry were carried out systematically.We found that high quality tower-shaped diamond single crystal in carats grade requires high growth conditions.Unmatched carbon diffusion field,quick growth speed and high synthesis temperature can cause surface defects of crystals.The diamond with more metal inclusion or polycrystalline diamond will be synthesized when growth rate is too quick.Polished by the shape of roughcast diamond,many cut diamonds with square shape,round shape or ellipse shape have been gained.The machining method can substantially reduce grinding and processing cost.

关 键 词：高温高压 克拉级 金刚石 包裹体 

分 类 号：TQ164[化学工程—高温制品工业]