Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 816, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.152598
Keywords
WC-Co; Grain growth inhibitor; Grain morphology; Mechanical properties; Spark plasma sintering
Categories
Funding
- National Natural Science Foundation of China [51775280, 51675285]
- Jiangsu Provincial Six Talent Peaks Project [2016-HKHT-019]
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This work is focused on the preparation and properties of ultrafine WC-Co cemented carbides. Samples were prepared by spark plasma sintering technology using WC and Co nanopowders and different inhibitors such as VC, Cr3C2 and TaC. The influence of inhibitors on the microstructure and mechanical properties of cemented carbides was investigated by using separate addition of VC/Cr3C2/TaC (0, 0.4 and 0.8 wt%) and pairwise addition (VC-Cr3C2, VC-TaC and Cr3C2-TaC). The results showed that with the addition of VC/Cr3C2/TaC, the average WC grain size decreased and VC led to smaller grain size than Cr3C2 and TaC. WC grain morphologies of cemented carbides with VC were triangular prisms with multi-step structure, whereas tended to be round and blunt in cemented carbides with Cr3C2/TaC. Moreover, the addition of inhibitors caused hardness to increase and fracture toughness to decrease in various degrees. Transverse rupture strength (TRS) was affected by changes in grain size and WC/Co interfacial energy caused by inhibitors. The sample with 0.4 wt% VC-0.4 wt% Cr3C2 sintered at 1250 degrees C had comprehensive mechanical properties. Its relative density, average grain size, hardness, fracture toughness and TRS were 98.9%, 200 nm, 2110 kg/mm(2), 10.4 MPa.m(1/2) and 1990 MPa, respectively. (C) 2019 Elsevier B.V. All rights reserved.
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