Fabrication of composites with excellent mechanical properties based on cubic boron nitride reinforced with carbon nanotubes |
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| Affiliation: | 1. School of Materials and Energy, University of Electronic Science and Technology of China, 2006 Xiyuan Road, Chengdu, PR China;2. National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, 2006 Xiyuan Road, Chengdu, PR China;3. Laboratory of Energy Storage and New Energy Materials Technology, Central Research Institute, Dongfang Electric Corporation, PR China;4. Phenikaa Institute for Advanced Study (PIAS), Phenikaa University, Yen Nghia Ward, Ha Dong District, Hanoi, 10000, Viet Nam;5. Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi, 10000, Viet Nam;1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, CEITEC IPM, ?i?kova 22, Brno, Czech Republic;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Ko?ice, Slovak Republic;3. Materials Research Institute, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;4. Nanoforce Technology Limited, Queen Mary University of London, London E1 4NS, United Kingdom |
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| Abstract: | Composites consisting of cubic boron nitride (cBN) as a matrix and carbon nanotubes (CNTs) as reinforcing additives were fabricated by high-temperature and high-pressure sintering (HTHP). Microstructures, mechanical properties, fracture modes and toughening mechanisms of these composites were investigated. Composites exhibited excellent bending strength, wear resistance, and fracture toughness. Fracture toughness of composites reached 7.02 MPa·m1/2. Comparing to pure cBN matrix, bending strength improved from 475.27 to 600.15 MPa, and wear resistance increased by 43.23%. Such improvements of mechanical properties were mainly attributed to pullout and bridging reinforcements by CNTs. CNTs incorporation also changed fracture mode from inter-to trans-granular. |
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| Keywords: | Composites Carbon nanotubes Toughness Fracture Wear resistance |
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