Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 16, Pages 18100-18107Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.08.119
Keywords
Inhomogeneous cemented carbides; Fine WC; Sintering; Microstructure; Mechanical properties
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Funding
- National Natural Science Foundation of China [51404302]
- Fundamental Research Funds for the Central Universities of Central South University [2015zzts181]
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Inhomogeneous WC-(fine WC-Co) cemented carbides with improved hardness and toughness were successfully prepared through the addition of fine WC using planetary ball milling combined with sinter isostatic hot pressing (SHIP) technology. The inhomogeneous microstructure of the alloys consisted of coarsened WC grains and WC-Co consisting of fine WC dispersoids and Co binder phase. The increase of temperature and the addition of fine WC enhanced the sintering process. The morphologies of the coarsened WC and of the fine WC consisted of triangular and near-hexangular prisms, respectively. Due to crack path deflection and crack bridging, the prism-like coarsened WC crystals efficiently hindered cracks propagation. Intergranular fracture became predominant when adding fine WC. However, the excessively coarsened WC and some pores in alloys with 20 wt% fine WC could decrease the mechanical properties. The inhomogeneous WC-(fine WC-Co) cemented carbides with 10 wt% fine WC, sintered at 1430 degrees C for 40 min, could provide a combination of superior hardness and toughness. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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