Title of article :
WC/Co composite surface structure and nano graphite precipitate induced by high current pulsed electron beam irradiation
Author/Authors :
S.Z. Hao، نويسنده , , Y. Zhang، نويسنده , , Y. Xu، نويسنده , , N. Gey، نويسنده , , T. Grosdidier، نويسنده , , C. Dong، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
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 WC1−x, Co3W9C4, Co3W3C 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 × 10−5 mm3/min to 6.3 × 10−6 mm3/min, showing a significant self-lubricating effect.
Keywords :
High current pulsed electron beam , Surface modification , WC/Co hard alloy , Nanostructure , Tribological property
Journal title :
Applied Surface Science
Journal title :
Applied Surface Science