Ultrafine WC-0.5Co-xTaC cemented carbides prepared by spark plasma sintering |
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| Affiliation: | 1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang, Liaoning 110819, China;2. Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;1. Centre of Excellence in Hypersonics, Indian Institute of Science, Bangalore, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kanpur, India;3. Materials Research Centre, Indian Institute of Science, Bangalore, India;4. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee, India;1. Department of Materials Science and Engineering, Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran;2. Department of Materials Science and Engineering, MUT, Tehran, Iran;1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510651, China;3. GRIPM Advanced Materials Co., Ltd, Beijing 101407, China;1. Arconic Engines, Midway, GA 31320, USA;2. Energy and Environmental Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA;3. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA;4. Department of Mechanical, Aerospace, and Biomedical Engineering, The University of Tennessee, Knoxville, TN 37996, USA |
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| Abstract: | Ultrafine (below 500 nm) tungsten carbide (WC) - 0.5 wt% cobalt (Co) cemented carbides were prepared by spark plasma sintering (SPS), containing varied tantalum carbide (TaC) contents, at 1500 °C under 50 MPa. The sintering behavior and microstructure of these materials were investigated. It was found that adding TaC could get a rapid shrinkage period during sintering and make a finer microstructure with a more narrowing range of the grain-size distribution. Adding inadequate or excessive amount of TaC, however, not only lower the sinterability but also get a result against the finer microstructure. Moreover, the (Ta,W)C solid-solution phase (formed by the part dissolution of WC in TaC grains) was mainly gathered at the WC grain boundary, and Co film was found. Benefiting from the ultrafine and homogeneous microstructure, these materials maintained excellent hardness and improved fracture toughness. |
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