Wear performance of spark plasma sintered Co/WC and cBN/Co/WC composites |
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| Affiliation: | 1. Eskisehir Osmangazi University, Department of Metallurgical & Materials Engineering, Meselik Campus, TR-26480 Eskisehir, Turkey;2. Sabanci University, Faculty of Engineering and Natural Sciences, TR-34956 Tuzla, Istanbul, Turkey;1. Dep. of Structural and Geotechnical Engineering, Università di Roma La Sapienza, 18 Via Eudossiana, Roma, Italy;2. Dep. of Mechanical and Aerospace Engineering, Università di Roma La Sapienza, 18 Via Eudossiana, Roma, Italy;3. MeMoCS International Research Center for the Mathematics & Mechanics of Complex Systems, Università dell’Aquila, Italy;4. Université de Lyon-INSA (Institut National des Sciences Appliquées), Laboratoire de Génie Civil et Ingénierie Environnementale (LGCIE) Bâtiment Coulomb,69100 Villeurbanne, France;5. MSE Department,208 Holden Hall, Mail Stop 0237, Virginia Tech, 445 Old Turner St. Blacksburg, VA, 24061, USA;6. ESM Department,208 Holden Hall, Mail Stop 0237, Virginia Tech, 445 Old Turner St. Blacksburg, VA, 24061, USA;7. Grenoble Institut Polytechnique, Laboratoire Sols Solides Structures Risques, BP 53, 38041 Grenoble cedex 9, France;1. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625 Renmin Street, Changchun 130022, Jilin, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The present study investigates the efficiency of spark plasma sintering (SPS) technique on the tribological behavior of tungsten carbide composites, and aims to develop the wear resistance of these composites by addition of cubic boron nitride (cBN). Wear tests of spark plasma sintered 6(wt.%)Co/WC, 25(vol%)cBN/6Co/WC and conventionally fabricated 6(wt.%)Co/WC as a reference sample were performed by ball-on-disk contact with dry and rotational sliding at room temperature in order to determine the friction coefficient and wear rate. Wear mechanisms were explained by using SEM observations and the wear rates were computed by a surface profilometer. In all cases, the major wear mechanisms were observed gradually in the form of microcraking, material removal by grain pull out, and generation and spalling of a tribochemical layer. Based on the experimental results, the addition of cBN considerably enhanced the wear resistance of tungsten carbides. In addition, these results revealed that SPS process has outstanding potential for the fabrication of tungsten carbides with high wear properties for tribological applications. |
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