Study on the diamond/ultrafine WC-Co cermets interface formed in a SPS consolidated composite

作     者：SHI Xiaoliang SHAO Gangqin DUAN Xinglong YUAN Runzhang 

作者机构：State Key Laboratory of Advanced Technology for Materials Synthesis ＆ Processing Wuhan University of Technology Wuhan 430070 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2006年第25卷第2期

页      面：150-155页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

基　　金：This work was financially supported by the National Natural Science Foundation of China (No. 50502026)  the Chinese 863 Program (No. 2002AA302504)  the Science Foundation of Wuhan University of Technology (No. xjj2005166)  and the Key Project for Science and Technology Development of Wuhan City (No. 20041003068-04) 

主　　题：diamond nanocrystalline WC-Co composite powders interface spark plasma sintering 

摘      要：Nanocrystalline WC-Co composite powder and coated tungsten diamond by using vacuum vapor deposition were consolidated by the spark plasma sintering （SPS） process to prepare diamond-enhanced WC-Co cemented carbide composite materials. The interface microstructures between coated tungsten diamond and WC-Co cemented carbide matrix were investigated by scanning electron microscopy （SEM） and energy dispersive X-ray spectroscopy （EDXS）. The results showed that there is a transitional layer between the diamond and the matrix, in which the carbon content is 62.97wt.%, and the content of cobalt in the transitional zone is 6.19wt.%; the content of cobalt in the WC-Co cemented carbide matrix is 6.07wt.%, in which the carbon content is 15.95wt.%, and the content of cobalt on the surface of diamond is 7.30wt.%, in which the carbon content is 80.38wt.%. The transitional zone prevents the carbon atom of the diamond from spreading to the matrix, in which the carbon content does coincide with the theoretical value of the raw nanocomposite powders, and the carbon content forms a graded distribution among the matrix, transitional zone, and the surface of diamond; after the 1280℃ SPS consolidated process the diamond still maintains a very good crystal shape, the coated tungsten on the surface of the diamond improves thermal stability of the diamond and increases the bonding strength of the interface between the diamond and the matrix.