热压烧结温度对石墨烯/氧化铝复合材料力学性能的影响  

The Effect of Hot-pressing Sintering Temperature on Graphene-reinforcedAlumina Matrix Composites

作　　者：贾碧 李晓博[2] 潘复生 王如转[2] 袁玉娇 罗春希 朱钊 刘汉蕾 JIA Bi;LI Xiaobo;PAN Fusheng;WANG Ruzhuan;YUAN Yujiao;LUO Chunxi;ZHU Zhao;LIU Hanlei(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;School of Metallurgy and Materials Engineering,Chongqing University of Science and Technology,Chongqing 401331,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆科技学院冶金与材料工程学院,重庆401331

出　　处：《材料导报》2020年第24期24001-24004,24009,共5页Materials Reports

基　　金：国家自然科学基金(11972100);重庆市技术创新与应用发展专项(cstc2019jscx-fxydX0075);重庆科技学院优秀创新人才培养资助计划(201604)。

摘　　要：石墨烯/氧化铝复合材料的制备工艺及力学性能已成为目前先进陶瓷材料的研究热点。通过热压烧结技术,在烧结压力40 MPa下成功制备了石墨烯/氧化铝复合材料,并系统地研究了热压烧结温度对石墨烯/氧化铝复合材料的结构和力学性能的影响规律。结果表明,热压烧结温度对石墨烯/氧化铝复合材料晶相的影响较小,均为Al 2O 3(刚玉)晶相。复合材料的抗弯强度、维氏硬度随着烧结温度的升高先增大后减小,但是烧结温度对断裂韧性的影响较小。当烧结温度为1550℃时复合材料的性能最优,材料的弯曲强度、维氏硬度与断裂韧性分别为673.84 MPa、20.4 GPa、5.98 MPa·m^1/2。同时,通过SEM分析了石墨烯增强氧化铝基复合材料的断面微观结构,揭示了晶粒尺寸变化是复合材料力学性能变化的主要原因。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 Al 2O 3(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 1550℃,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·m 1/2,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.

关 键 词：氧化铝复合材料 石墨烯 热压烧结温度 微观结构 力学性能 

分 类 号：TB383[一般工业技术—材料科学与工程]