黑滑石高温物相行为变化及其复合材料性能研究  

The Phase Behavior Changes of Black Talc at High Temperature and Performance of its Ceramic Composite Materials

作　　者：吴小文[1] 赵航[1] 张之介 黄朝晖[1] 闵鑫[1] 房明浩[1] 刘艳改[1] WU Xiaowen;ZHAO Hang;ZHANG Zhijie;HUANG Zhaohui;MIN Xin;FANG Minghao;LIU Yangai(Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes,National Laboratory of Mineral Materials, School of Materials Science and Technology,China University of Geosciences (Beijing), Beijing, 100083, China)

机构地区：[1]非金属矿物与固废资源材料化利用北京市重点实验室矿物岩石材料开发应用国家专业实验室中国地质大学(北京)材料科学与工程学院,北京100083

出　　处：《陶瓷学报》2017年第4期476-480,共5页Journal of Ceramics

基　　金：国家自然科学基金资助(项目号51372232)

摘　　要：以黑滑石为原料,研究了不同温度和气氛下煅烧或炭化过程中的物相行为变化,并以煅烧/炭化产物为原料烧结制备出石墨烯增强顽火辉石基复合材料。采用X射线衍射和透射电子显微技术表征了煅烧产物及复合材料的物相和表面形貌。采用三点弯曲试验机、高电阻测试仪和导热系数测定仪分别测试了复合材料的力学性能、导电和导热性能。结果表明,在氮气气氛下高温处理后的滑石粉中存在多层石墨烯,这对复合材料的性能的提高起到重要的作用。氮气气氛下炭化产物所制备的复合材料较空气气氛下煅烧产物所制得的复合材料而言,其平均抗折强度提高约10 MPa,电阻率低一个数量级,平均导热系数提高了约6.2×10^(-1) W/(m·K)。In the present work the phase behavior of black talc calcined in different temperature and atmosphere was investigated.Thegraphene reinforced composites was prepared by pressless sintering with the calcined product as raw material.The phase and morphologyof the composites were characterized by X-ray diffraction and transmission electron microscopy.The mechanical properties,electricalconductivity and thermal conductivity of the composite samples were measured by electron universal tester,high resistance tester and thermalconductivity coefficient tester,respectively.The results showed that multilayer graphene exists in the calcined products.The existence ofgraphene has an important influence on the properties of the composites.As far as performance is concerned,the composite samples calcinedunder nitrogen atmosphere is better than the composite samples calcined under air atmosphere.The average flexural strength of the compositeswas increased by about10MPa,the electrical resistivity decreased about one order of magnitude,and the average thermal conductivityincreased by about6.2×10-1W/m·K.

关 键 词：黑滑石 石墨烯 顽火辉石 抗折强度 电阻率 热导率 

分 类 号：TQ174.75[化学工程—陶瓷工业]