WC/Co composite surface structure and nano graphite precipitate induced by high current pulsed electron beam irradiation

Abstract : High current pulsed electron beam (HCPEB) irradiation was conducted on a WC-6% Co hard alloy with accelerating voltage of 27 kV and pulse duration of 2.5 vs. The surface phase structure was examined by using glancing-angle X-ray diffraction (GAXRD), scanning electron microscope ( SEM) and high resolution transmission electron microscope (HRTEM) methods. The surface tribological properties were measured. It was found that after 20 pulses of HCPEB irradiation, the surface structure of WC/Co hard alloy was modified dramatically and composed of a mixture of nano-grained WC1 _,, CO3 W9 C4, CO3 W3 C phases and graphite precipitate domains 50 nm. The friction coefficient of modified surface decreased to 0.38 from 0.6 of the initial state, and the wear rate reduced from 8.4 x 10-5 mm3 /min to 6.3 x 10-6 mm3 /min, showing a significant self-lubricating effect.
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Applied Surface Science, Elsevier, 2013, 285 (B), pp.552-556. 〈10.1016/j.apsusc.2013.08.092〉
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https://hal.univ-lorraine.fr/hal-01502123
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Soumis le : mercredi 5 avril 2017 - 10:04:07
Dernière modification le : mercredi 12 septembre 2018 - 01:26:28

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S. Z. Hao, Y. Zhang, Y. Xu, Nathalie Gey, Thierry Grosdidier, et al.. WC/Co composite surface structure and nano graphite precipitate induced by high current pulsed electron beam irradiation. Applied Surface Science, Elsevier, 2013, 285 (B), pp.552-556. 〈10.1016/j.apsusc.2013.08.092〉. 〈hal-01502123〉

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