以碳纳米管为外加碳源爆轰合成聚晶金刚石  

Synthesis of Polycrystalline Diamond from Carbon Nanotubes Using Direct Detonation Method

作　　者：商士远 仝毅[1] 王志超 黄风雷[1] SHANG Shiyuan;TONG Yi;WANG Zhichao;HUANG Fenglei(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《兵工学报》2023年第7期1993-2001,共9页Acta Armamentarii

基　　金：国家自然科学基金项目(11572047)。

摘　　要：为研究碳纳米管在爆轰过程中的变化机理,采用直接爆轰法,以碳纳米管为外加碳源进行合成实验,对爆轰产物进行化学提纯后得到提纯产物,通过X射线衍射技术对提纯产物进行表征,发现提纯产物为金刚石。借助透射电子显微镜和扫描电子显微镜对提纯产物形貌进行表征,通过深入分析,发现爆轰过程中碳纳米管以固-固原位相变的形式相变为金刚石,且同一个碳纳米管上会形成多个晶核同时生长形成晶体,相邻的晶体接触后形成晶界,停止生长并形成聚晶体。根据形成的金刚石晶体的周向、径向、轴向尺寸的不同,以及形成聚晶体中晶体的数量与位置的不同,可以得到管状、片状、块状等形状各异的聚晶金刚石颗粒。To study the phase transformation mechanism of carbon nanotubes during detonation,synthesis experiments were carried out using direct detonation method with carbon nanotubes as the additional carbon source.The detonation product was chemically purified.X-ray diffraction(XRD)was used to characterize the purified product,and it was found that the product consisted of diamond.The purified product was characterized by transmission electron microscopy(TEM)and scanning electron microscopy(SEM),and after in-depth analysis,it was found that the carbon nanotubes transformed into diamond through solid in situ phase change during the detonation process.Multiple cores were observed on a carbon nanotube to form crystals at the same time.When adjacent crystals came into contact,crystal boundaries were formed,limiting growth in specific directions to form polycrystals.Depending on the circumferential,radial and axial dimensions of the formed diamond crystals,as well as the number and position of the crystals in the formed polycrystals,polycrystalline diamond particles of different shapes such as tubes,flakes,and blocks were obtained.

关 键 词：碳纳米管 聚晶金刚石 直接爆轰法 多核生长 

分 类 号：O389[理学—流体力学] TJ55[理学—力学]