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Indexed by:期刊论文

Date of Publication:2013-11-15

Journal:APPLIED SURFACE SCIENCE

Included Journals:SCIE、EI、Scopus

Volume:285

Issue:PARTB

Page Number:552-556

ISSN No.:0169-4332

Key Words:High current pulsed electron beam; Surface modification; WC/Co hard alloy; Nanostructure; Tribological property

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. (C) 2013 Elsevier B.V. All rights reserved.