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Materials 2017, 10(1), 57; doi:10.3390/ma10010057

Liquid Phase Sintering of (Ti,Zr)C with WC-Co

1
Department of Materials Science and Engineering, KTH Royal Institute of Technology, Stockholm SE-100 44, Sweden
2
Sandvik Coromant Research and Development, Stockholm SE-126 80, Sweden
3
Sandvik Mining AB, Research and Development Rock Tools, Stockholm SE-126 80, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Walter Lengauer
Received: 7 December 2016 / Revised: 2 January 2017 / Accepted: 6 January 2017 / Published: 11 January 2017
(This article belongs to the Special Issue Sintering and Properties of Hardmetals)
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Abstract

(Ti,Zr)C powder was sintered with WC-Co following an industrial process, including an isotherm at 1410 °C. A series of interrupted sintering trials was performed with the aim of studying the sintering behavior and the microstructural evolution during both solid-state and liquid-state sintering. Reference samples, using the same elemental compositions but with the starting components TiC and ZrC instead of (Ti,Zr)C, were also sintered. The microstructure was investigated using scanning electron microscopy and energy dispersive X-ray spectroscopy. It is found that the (Ti,Zr)C phase decomposes into Ti-rich and Zr-rich nano-scale lamellae before the liquid-state of the sintering initiates. The final microstructure consists of the binder and WC as well as two different γ phases, rich in either Ti (γ1) or Zr (γ2). The γ2 phase grains have a core-shell structure with a (Ti,Zr)C core following the full sintering cycle. The major differences observed in (Ti,Zr)C with respect to the reference samples after the full sintering cycle were the referred core-shell structure and the carbide grain sizes; additionally, the microstructural evolution during sintering differs. The grain size of carbides (WC, γ1, and γ2) is about 10% smaller in WC-(Ti,Zr)C-Co than WC-TiC-ZrC-Co. The shrinkage behavior and hardness of both composites are reported and discussed. View Full-Text
Keywords: cemented carbides; ternary cubic carbide; liquid-phase sintering; scanning electron microscopy; energy dispersive X-ray spectroscopy; dilatometer; differential scanning calorimetry cemented carbides; ternary cubic carbide; liquid-phase sintering; scanning electron microscopy; energy dispersive X-ray spectroscopy; dilatometer; differential scanning calorimetry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ma, T.; Borrajo-Pelaez, R.; Hedström, P.; Blomqvist, A.; Borgh, I.; Norgren, S.; Odqvist, J. Liquid Phase Sintering of (Ti,Zr)C with WC-Co. Materials 2017, 10, 57.

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