Preparation of tungsten diboride by a combination of boro/carbothermal reduction process and spark plasma sintering |
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| Affiliation: | 1. State Key laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;1. Université de Bordeaux, CNRS, Laboratoire des Composites ThermoStructuraux, UMR 5801, 33600 Pessac, France;2. Université de Bordeaux, CNRS, PLACAMAT UMS 3626, 33600 Pessac, France;1. NPU-SAS Joint Research Center and NPU-QMUL Joint Research Institute, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;3. Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China;1. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China;2. Department of Materials Science and Engineering, City University of Hong Kong, 999077, Hong Kong, China;1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China;2. Key Laboratory for Neutron Physics, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China;3. College of Science, Southwest University of Science and Technology, Mianyang 621900, China;4. Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, College of Engineering Physics, and Center for Advanced Material Diagnostic Technology, Shenzhen Technology University, Shenzhen 518118, China;1. Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China;2. Fujian Key Laboratory of Advanced Materials (Xiamen University), Xiamen 361005, China;3. Key Laboratory of High Performance Ceramics Fibers (Xiamen University), Ministry of Education, Xiamen 361005, China |
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| Abstract: | Submicron tungsten diboride (WB2) powder was successfully synthesized with the ratio of WO3:B4C:C = 2:1.1:5. The effects of carbon sources (carbon black or graphite) and heat treatment temperatures (1100, 1200, 1300 ℃) on the phase composition and microstructure of the as-synthesized WB2 powder samples were studied. The results showed that ultrafine WB2 powders with oxygen content of 1.65 wt% and 2.04 wt% were obtained by carbon black and graphite at 1300 ℃, respectively. The relatively density of the as-sintered WB2 samples achieve ~ 91 % and ~ 87 % without any kind of sintering additive after spark plasma sintering at 1500 °C under 30 MPa for 10 min. The formation mechanism of the WB2 powders synthesized by boro/carbothermal reduction was proposed and verified by thermodynamic calculation according to the phases present in the powder synthesized at different temperatures. |
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| Keywords: | Tungsten diboride Boro/carbothermal reduction Synthesis mechanism Densification |
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