Binderless WC and WC–VC materials obtained by pulsed electric current sintering
2007; Elsevier BV; Volume: 26; Issue: 1 Linguagem: Inglês
10.1016/j.ijrmhm.2007.01.002
ISSN0263-4368
AutoresShuigen Huang, Kim Vanmeensel, Omer Van der Biest, Jef Vleugels,
Tópico(s)Advanced ceramic materials synthesis
ResumoWC and WC–VC materials without metallic binder addition were densified by pulsed electric current sintering (PECS) in the 1600–1900 °C range. The densification mechanism, microstructure and mechanical properties of the pure WC and VC-doped WC carbides were investigated. The densification of WC–VC materials was accompanied with the formation of a cubic (V, W)C solid solution. Although no abnormal WC grain growth was observed, the (V, W)C grains were observed to grow rapidly with increasing VC content. A maximum Vickers hardness (HV10) of 27.39 GPa in combination with an indentation toughness of 4.38 MPa m1/2 was obtained for the PECS pure and 1 wt% VC doped WC grades. The hardness was found to linearly decrease down to 21.41 GPa with further addition of VC up to 16 wt%, with a slightly decreased fracture toughness.
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