Preparation and properties of Ni-coated WC powder and highly impact resistant and corrosion resistant WC-Ni cemented carbides

作     者：Fan-lu MIN Song-bai YU Sheng WANG Zhan-hu YAO Jacques Guillaume NOUDEM Si-jin LIU Jian-feng ZHANG 闵凡路;于淞百;汪升;姚占虎;Jacques Guillaume NOUDEM;刘四进;张建峰

作者机构：Key Laboratory of Geomechanics and Embankment EngineeringMinistry of EducationHohai UniversityNanjing 210098China College of Civil and Transportation EngineeringHohai UniversityNanjing 210098China College of Mechanics and MaterialsHohai UniversityNanjing 210098China CCCC Tunnel Engineering Company LimitedBeijing 100102China CRISMAT-ENSICAEN(UMR-CNRS 6508)Universitéde Caen-Basse-NormandieCaenF-14050France China Railway 14th Bureau Group Co.Ltd.Jinan 250101China 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2022年第32卷第6期

页      面：1935-1947页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 

基　　金：the financial supports from the National Natural Science Foundation of China (Nos. 51778213, 52078189) the Fundamental Research Funds for the Central Universities, China (No. B200202073) 

主　　题：WC−Ni cemented carbides chemical co-precipitation method high temperature hydrogen reduction strategy Ni content microstructure impact toughness corrosion resistance 

摘      要：WC powders were uniformly coated by Ni nanoparticles through a combined chemical co-precipitation and subsequent high temperature hydrogen reduction strategy(abbreviated as CM-WCN),and then were consolidated by vacuum sintering at 1450°C for 1 h to obtain WC−Ni cemented *** microstructure and properties of the as-consolidated CM-WCN were *** average grain size of WC in the consolidated CM-WCN was calculated to be in the range of 3.0−3.8μm and only few pores were observed.A relative density of 99.6%,hardness of HRA 86.5 and bending strength of 1860 MPa were obtained for the CM-WCN−10wt.%Ni,and the highest impact toughness of 6.17 J/cm^(2 )was obtained for the CM-WCN−12wt.%Ni,surpassing those of the hand mixed WC−Ni(HM-WCN)cemented carbides examined in this study and the other similar materials in the ***-WCN cemented carbides possess excellent mechanical properties,due to their highly uniform structure and low porosity that could be ascribed to the intergranular-dominated fracture mode accompanied by a large number of plastic deformation tears of the bonding *** addition,the corrosion resistance of CM-WCN was superior to that of HM-WCN at the Ni content of 6−12 wt.%.