Effect of Mo2C on the Microstructure and Corrosion Resistance of Fine WC-6Co Cemented Carbides Fabricated by SPS
Fine WC-6Co cemented carbides with improved mechanical properties and corrosion resistance were successfully prepared through the addition of Mo2C using spark plasma sintering(SPS)technology.The phase composition,microstructure,mechanical properties and corrosion behavior were investigated via XRD,SEM,TEM,XPS,mechanical property tests and potentiodynamic polarization curve measurements.The results show that the(111)peak of fcc-Co binder phase of cemented carbides with Mo2C addition shift slightly toward the negative direction owing to the expansion of Co lattice.The addition of Mo2C was beneficial for refining the WC grains.Moreover,the crystal of WC grains gradually changes from triangular and quadrilateral to nearly round.The hardness of alloys increased until the maximun value,and then followed a decreasing trend with the increase of Mo2C content.Furthermore,with the increase of Mo2C content,the relative density decreased continuously,which caused to an decreasing trend in fracture toughness.The corrosion resistance improved significantly both in 0.1 M HCl and NaOH solutions with the addition of Mo2C.However,the strengthening mechanisms are different in acidic and alkaline solutions.In addition,the corrosion resistance decreases when the content of Mo2C exceeds 2 wt.%.The adding amount of Mo2C should be controlled within a certain range and 1 wt%of Mo2C has the most positive effect on the comprehensive properties of WC-6Co alloys.
WC-6Co cemented carbides Molybdenum carbide Microstructure Corrosion behavior Aggressive medium
Guo Shengda Yi Jianhong Bao Rui Yang Jiangao Chen Hao Su We
Institute of Engineering Research,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 34100 School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650 Institute of Engineering Research,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 34100
国际会议
北京
英文
903-912
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）