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Wear resistance of nanostructured Cr-based WC hardmetals sintered by spark plasma sintering
International Journal of Refractory Metals & Hard Materials ( IF 2.794 ) Pub Date : 2019-10-24 , DOI: 10.1016/j.ijrmhm.2019.105121
Xiangxing Deng, Núria Cinca, Dariusz Garbiec, José Manuel Torralba, Andrea García-Junceda

Nanostructured Cr-based WC hardmetals are successfully sintered by spark plasma sintering. The wear behaviour of these Cr-based WC hardmetals with different C contents ranging from 5.57 wt% to 6.91 wt%, is evaluated performing sliding wear tests under two different wear conditions. This work analyses the influence of the C content on the wear performance through the study of the phase formation and WC grain size. The Cr-based hardmetal with 5.57 wt% C content exhibits a lower wear rate than Co-based WC hardmetals tested under similar dry ball-on-plate wear conditions, even considering that these Co-based WC hardmetals have higher WC content (90 wt%) than Cr-based WC hardmetals (83.2 wt%). The combination of a nanosized WC grain and the avoidance of brittle (Cr,Fe)7C3 or soft graphite phases leads to a superior wear performance. Thus, the use of Cr-based binders in the hardmetal industry, alternatively to Co-based binders, is promising in applications in which high wear resistance is needed.
更新日期:2019-12-11

 

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