Microstructure and properties of a graphene platelets toughened boron carbide composite ceramic by spark plasma sintering |
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| Authors: | Mingdan Chen Zengbin Yin Juntang Yuan Weiwei Xu Jiadong Ye Shiyu Yan |
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| Affiliation: | 1. Nanjing University of Science and Technology, School of Mechanical Engineering, Nanjing 210094, PR China;2. Collaborative Innovation Center of High-End Equipment Manufacturing Technology (Nanjing University of Science and Technology), Ministry of Industry and Information Technology, PR China |
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| Abstract: | A kind of B4C/SiC composite ceramic toughened by graphene platelets and Al was fabricated by spark plasma sintering. The effects of graphene platelets and Al on densification, microstructure and mechanical properties were studied. The sintering temperature was decreased about 125–300?°C with the addition of 3–10?wt% Al. Al can also improve fracture toughness but decrease hardness. The B4C/SiC composite ceramic with 3?wt%Al and 1.5?wt% graphene platelets sintered at 1825?°C for 5?min had the optimal performances. It was fully densified, and the Vickers hardness and fracture toughness were 30.09?±?0.39?GPa and 5.88?±?0.49?MPa?m1/2, respectively. The fracture toughness was 25.6% higher than that of the composite without graphene platelets. The toughening mechanism of graphene platelets was also studied. Pulling-out of graphene platelets, crack deflection, bridging and branching contributed to the toughness enhancement of the B4C-based ceramic. |
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| Keywords: | Graphene platelets Mechanical properties Toughening mechanisms Spark plasma sintering |
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