Densification and mechanical properties of boron carbide prepared via spark plasma sintering with cubic boron nitride as an additive |
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| Affiliation: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, PR China;2. School of Science, Wuhan University of Technology, Wuhan, 430070, PR China;1. CIEFMA - Department of Materials Science and Metallurgy, EEBE - Campus Diagonal Besòs, Universitat Politècnica de Catalunya - BarcelonaTech, 08019 Barcelona, Spain;2. Barcelona Research Center in Multiscale Science and Engineering, Campus Diagonal Besòs, Universitat Politècnica de Catalunya - BarcelonaTech, 08019 Barcelona, Spain;3. Element Six, Global Innovation Centre, Harwell Campus, Didcot OX11 0QR, UK;4. Nanomechanics Inc., Oak Ridge, TN 37830, USA;1. Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia;2. Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia;3. College of Aeronautical Engineering, National University of Science & Technology (NUST), Pakistan;4. Centre for Engineering Research, King Fahd University of Petroleum and Minerals (KFUPM), Saudi Arabia;5. Department of Metallurgical and Materials Engineering University of Engineering and Technology, Lahore, Pakistan;6. Faculty of Materials Science and Engineering, GIK Institute of Engineering Sciences and Technology, Topi, Swabi, KPK, Pakistan |
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| Abstract: | Hexagonal boron nitride (h-BN) can reinforce boron carbide (B4C) ceramics, but homogeneous dispersion of h-BN is difficult to achieve using conventional methods. Herein, B4C/h-BN composites were manufactured via the transformation of cubic (c-) BN during spark plasma sintering at 1800 °C. The effects of the c-BN content on the microstructure, densification, and mechanical properties of B4C/h-BN composites were evaluated. In situ synthesized h-BN platelets were homogeneously dispersed in the B4C matrix and the growth of B4C grains was effectively suppressed. Moreover, the c-BN to h-BN phase transformation improved the sinterability of B4C. The sample with 5 vol.% c-BN exhibited excellent integrated mechanical properties (hardness of 30.5 GPa, bending strength of 470 MPa, and fracture toughness of 3.84 MPa⋅ m1/2). Higher c-BN contents did not significantly affect the bending strength and fracture toughness but clearly decreased the hardness. The main toughening mechanisms were crack deflection, crack bridging, and pulling out of h-BN. |
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| Keywords: | Phase transformation Spark plasma sintering Densification Mechanical properties |
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