Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5352363 | Applied Surface Science | 2013 | 5 Pages |
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 μs. 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 WC1âx, Co3W9C4, Co3W3C phases and graphite precipitate domains â¼50 nm. The friction coefficient of modified surface decreased to â¼0.38 from 0.6 of the initial state, and the wear rate reduced from 8.4 Ã 10â5 mm3/min to 6.3 Ã 10â6 mm3/min, showing a significant self-lubricating effect.
Related Topics
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Authors
S.Z. Hao, Y. Zhang, Y. Xu, N. Gey, T. Grosdidier, C. Dong,