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Study on Microstructure and Mechanical Properties of WC-10Ni3Al Cemented Carbide Prepared by Different Ball-Milling Suspension

1
Guangdong Key Laboratory for Advanced Metallic Materials Fabrication and Forming, National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China
2
Department of Materials Science and Engineering, University of California, Irvine, CA 92697, USA
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2224; https://doi.org/10.3390/ma12142224
Received: 21 June 2019 / Revised: 8 July 2019 / Accepted: 9 July 2019 / Published: 10 July 2019
(This article belongs to the Section Advanced Composites)
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Abstract

In this paper, WC-10Ni3Al cemented carbides were prepared by the powder metallurgy method, and the effects of ball-milling powders with two different organic solvents on the microstructure and mechanical properties of cemented carbides were studied. We show that the oxygen in the organic solvent can be absorbed into the mixed powders by ball-milling when ethanol (CH3CH2OH) is used as a ball-milling suspension. This oxygen leads to the formation of α-Al2O3 during sintering, which improves the fracture toughness, due to crack deflection and bridging, while the formation of η-phase (Ni3W3C) inhibits the grain growth and increases the hardness. Alternatively, samples milled using cyclohexane (C6H12) showed grain growth during processing, which led to a decrease in hardness. Therefore, the increase of oxygen content from using organic solvents during milling improves the properties of WC-Ni3Al composites. The growth of WC grains can be inhibited and the hardness can be improved without loss of toughness by self-generating α-Al2O3 and η-phase (Ni3W3C). View Full-Text
Keywords: WC-10Ni3Al; oxygen; ball-milling suspension; α-Al2O3; η-phase WC-10Ni3Al; oxygen; ball-milling suspension; α-Al2O3; η-phase
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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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Zhang, M.; Cheng, Z.; Li, J.; Qu, S.; Li, X. Study on Microstructure and Mechanical Properties of WC-10Ni3Al Cemented Carbide Prepared by Different Ball-Milling Suspension. Materials 2019, 12, 2224.

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