Deng Fuming1,2;Lu Xuejun1,3;Liu Ruiping1;Xu Guojun3;Chen Quwu1;Li Wenzhu2
(1.Department of Materials Science and Engineering, China University of Mining
and Technology, Beijing Campus, Beijing 100083, China)
(2.Department of Physics, Zhejiang University, Hangzhou 310027, China)
(3.Beijing Institute of Electromachining, Beijing 100083, China)
Abstract A regrown composite fiber was synthesized during the sintering of diamond under high pressure 5.8 GPa and high temperature 1500 ℃ for 1 min, using 3wt% MWCNTs as additive. SEM observation of the fiber after alkali and acid treatment revealed that the outer layer of the fiber is composed of nano-polycrystalline diamond. EDS, XPS, XRD and Raman spectrum analysis further identified that the fiber is composed of MWCNTs in the inner part and nano-polycrystalline diamond in the out layer. It is proposed that the untransformed MWCNTs may act as a template for the regrown outer layer of nano diamond fiber under high pressure and high temperature.