Effect of Cobalt Content on Microstructures and Wear Resistance of Tungsten Carbide_Cobalt-Cemented Carbides Fabricated by Spark Plasma Sintering

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Ma, Renqi^1 ; Ju, Shaodong^1 ; Chen, Haiyan^2 ; Shu, Chenyang^2

China National Offshore Oil, Corporation Energy Technology Drilling and Production Company, Tianjin

300452, China^1

College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai

201306, China^2

关键词: Cemented carbides;    Co content;    Co phase;    Cobalt content;    Friction and wear;    Tungsten carbide cobalt;    WC-Co cemented carbide;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012019/pdf
DOI  :  10.1088/1757-899X/207/1/012019

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

We researched tungsten carbide-cobalt (WC-Co)-cemented carbides without binder and with little binder and sintered by spark plasma sintering with 0 wt. %, 0.2 wt. %, 0.5 wt. % and 0.8 wt. % Co at different temperatures. The microstructures, hardness, fracture toughness and wear resistance of the WC-Co-cemented carbides were investigated by scanning electron microscopy and mechanical property tests. The wear resistance of WC-Co-cemented carbides with little to no binder is acceptable and it decreases with increase in Co content. There is no significant difference in wear resistance at 0 wt. % and 0.2 wt. % Co content. By analysing the friction and wear mechanism, it can be concluded that because the Co phase was extruded first, the stability of the WC hard base was disrupted, the WC phase desquamated and abrasion occurred. WC-cemented carbide with 0.2 wt. % Co is the most suitable material. The best results were achieved at 1680°C with 2333 HV30 and 6.82 MPa.m1/2