The Effect of Hot-pressing Sintering Temperature on Graphene-reinforced Alumina Matrix Composites
JIA Bi1,2, LI Xiaobo2, PAN Fusheng1, WANG Ruzhuan2, YUAN Yujiao2, LUO Chunxi2, ZHU Zhao2, LIU Hanlei2
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China 2 School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Abstract: The research on the preparation technology and mechanical properties of graphene-reinforced alumina matrix composites has attracted extensive attention. In our work, the graphene-reinforced alumina matrix composites were successfully prepared by hot pressing sintering technology at sintering pressure of 40 MPa. The influence of hot-pressing sintering temperature on the structure and mechanical properties of graphene-reinforced alumina matrix composites was systematically studied. The results show that hot-pressing sintering temperature has little effect on the crystal phase of graphene-reinforced alumina matrix composites, which are all Al2O3 (corundum) crystal phase. With increasing of sintering temperature, the bending strength and Vickers hardness of the composite increase and then decrease obviously, but the effect of sintering temperature on fracture toughness is very small. When the sintering temperature reaches to 1 550 ℃, the composite has the best properties, bending strength, fracture toughness, Vickers hardness of graphene/alumina matrix composites were 673.84 MPa, 20.4 GPa and 5.98 MPa·m1/2, respectively. Furthermore, the microstructure of graphene reinforced alumina matrix composite hot pressed at different temperature indicates that the change of grain size result in the change of mechanical properties of composites.
贾碧, 李晓博, 潘复生, 王如转, 袁玉娇, 罗春希, 朱钊, 刘汉蕾. 热压烧结温度对石墨烯/氧化铝复合材料力学性能的影响[J]. 材料导报, 2020, 34(24): 24001-24004.
JIA Bi, LI Xiaobo, PAN Fusheng, WANG Ruzhuan, YUAN Yujiao, LUO Chunxi, ZHU Zhao, LIU Hanlei. The Effect of Hot-pressing Sintering Temperature on Graphene-reinforced Alumina Matrix Composites. Materials Reports, 2020, 34(24): 24001-24004.
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