Ceramics-Silikáty 60, (1) 85 - 90 (2016) |
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MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ULTRAFINE WC/Co CEMENTED CARBIDES WITH CUBIC BORON NITRIDE AND Cr₃C₂ ADDITIONS
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Zhang Genrong 1, Chen Haiyan 2, Dong Lihua 2, Yin Yansheng2, Li Kun 2
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1 Logistics Engineering College, Shanghai Maritime University, Shanghai 201306, China
2 College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China
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Keywords: Crystal inhibitor, Mechanical properties, Ultrafine microstructure, Cemented carbide, Tungsten carbide, Chromium carbide, Cubic boron nitride
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This study investigates the microstructure and mechanical properties of ultrafine tungsten carbide and cobalt (WC/Co) cemented carbides with cubic boron nitride (CBN) and chromium carbide (Cr₃C₂) fabricated by a hot pressing sintering process. This study uses samples with 8 wt% Co content and 7.5 vol% CBN content, and with different Cr₃C₂ content ranging from 0 to 0.30 wt%. Based on the experimental results, Cr₃C₂ content has a significant influence on inhibiting abnormal grain growth and decreasing grain size in cemented carbides. Near-full densification is possible when CBN-WC/Co with 0.25 wt% Cr₃C₂ is sintered at 1350°C and 20 MPa; the resulting material possesses optimal mechanical properties and density, with an acceptable Vickers hardness of 19.20 GPa, fracture toughness of 8.47 MPa.m1/2 and flexural strength of 564 MPa. |
Record in: Scopus | Web of Science |
 PDF (1.7 MB) |
doi: 10.13168/cs.2016.0013
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