Effect of Mo2C addition on the formation of core-rim structure and mechanical properties of Ti(C,N)-WC-Mo2C-(Ni, Co) cermet

Qiu, Hao; Li, Xiaoqiang; Pan, Cunliang; Fan, Jiafeng; Qu, Shengguan

doi:10.1016/j.jmrt.2023.05.224

Cited by 4 publications

(1 citation statement)

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“…The powders were precisely weighed and mixed based on the specified composition provided in Table 2 . The content range of Mo 2 C addition was determined based on the previous studies of our team and other researchers [ 18 , 26 , 27 ]. Subsequently, they were wet-milled in an ethanol bath using YG8 cemented carbide balls in a planetary ball mill (QM-3SP4, NanDa Instrument Plant, Nanjing, China) for 24 h at a rotational speed of 200 r/min.…”

Section: Methodsmentioning

confidence: 99%

Effect of Mo2C Addition on the Tribological Behavior of Ti(C,N)-Based Cermets

Qiu

Pan

et al. 2023

Materials

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Due to the excellent properties of Ti (C,N)-based ceramics, such as high hardness, excellent wear resistance, exceptional thermal deformation resistance, and sound chemical stability, they have been widely used in cutting tools or molds. Thus, revealing their tribological behavior against hard materials is of great significance. Some studies have reported the tribological behavior of Ti(C,N)-based cermets and hard cermets, but so far, the effects of Mo2C additions on the frictional properties of Ti(C,N)-based cermets are still unclear. In this study, Ti(C,N)-10WC-1Cr3C2-5Co-10Ni-x Mo2C cermets (x = 4, 6, 8, 10 and 12 wt.%) were sintered using a vacuum hot-pressing furnace. Furthermore, the core–rim morphologies of the sintered samples were observed in SEM images. Then, the wear resistance of the cermets was studied against a Si3N4 ball at a 50 N load using the fretting wear test. Finally, the wear mechanism was characterized using a combination of SEM, EDS and XPS. The experimental results indicated that the wear mechanisms of the cermets were mainly abrasive wear, adhesive wear, and the formation of an oxide film. As the content of Mo2C increased from 4 wt.% to 12 wt.%, the friction coefficient and wear volume had a variation law of first decreasing and then decreasing, and reached minimum values at 6 wt.% and 12 wt.%, and the lowest friction coefficient and wear rate were 0.49 and 0.9 × 10−6 mm3/Nm, respectively. The 6 wt.% Mo2C greatly improved the hardness and fracture toughness of the cermet, while the 12 wt.% Mo2C promoted the formation of an oxide film and protected the friction surface. The cermet with 6 wt.% Mo2C is recommended because it has comprehensive advantages in terms of its mechanical properties, tribological properties, and cost.

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Section: Methodsmentioning

confidence: 99%