Effect of multi-walled carbon nanotube addition on the microstructures and mechanical properties of Ti(C,N)-based cermets

作     者：P.WU S.C.LIU X.R.JIANG 

作者机构：College of Chemistry and Materials Science Longyan University 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2018年第7卷第1期

页      面：58-63页

核心收录：

学科分类：0817[工学-化学工程与技术] 08[工学] 

基　　金：financially supported by the Science and Technology Department of Fujian Province under Project No.2014H0037 the Production,Education and Research of Fujian Provincial Education Department under Project No.JK2016040 the Key Subject Project of Fujian Province 

主　　题：Ti(C,N)-based cermets microstructure mechanical property fracture toughness 

摘      要：The surface modification of multi-walled carbon nanotubes(MWCNTs) was carried out using plasma treatment. The microstructures of the prepared cermets with different additions of MWCNTs were investigated by scanning electron microscopy(SEM), transmission electron microscopy(TEM), energy dispersive X-ray analysis(EDX), and X-ray diffraction(XRD). Mechanical properties such as transverse rupture strength(TRS), fracture toughness(K_(IC)), and hardness(HRA) were measured. The results showed that some reactive groups were successfully modified on the surface of MWCNTs, resulting in the improvement of dispersibility. Most of the amorphous carbons and impurities were peeled from the MWCNTs. Increasing MWCNT addition decreased the dissolution of tungsten, titanium, and molybdenum in the binder phase. The cermet with 0.5 wt% MWCNT addition showed the highest TRS and fracture toughness. The strengthening mechanisms were attributed to the finer grain size, the homogeneous microstructure, and the higher volume fraction of binder phase in the binder. The toughening mechanisms were characterized by bridging and pulling-out.