Si_3N_4/SiC/BT/硅橡胶复合材料的制备及介电性能研究  

Preparation of Composite Material of Si_3N_4/SiC/BT/Silicone Rubber and Research on its Dielectrical Property

作　　者：关钰 梁潇 姚军龙[1] 江学良[1] 孙争光 祁耀斌[3] 陈思 高琳[5] GUAN Yu;LIANG Xiao;YAO Jun-long;JIANG Xue-liang;SUN Zheng-guang;QI Yao-bin;CHEN Si;GAO Lin(Material Science and Engineering School,Wuhan Engineering University,Wuhan Hubei430073,China;Key Laboratory of Green Preparation and Application of Functional Materials of the Ministry of Education, Hubei University,Wuhan Hubei430062,China;National Engineering Laboratory of Optical Fiber Sensing Technology, Wuhan University of Science and Technology,Wuhan Hubei430072,China;Hubei Hongzhao Building Materials Co.,Ltd., Macheng Hubei438302,China;College of Chemical and Environmental Engineering,Jianghan University,Wuhan Hubei430056,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430073 [2]湖北大学功能材料绿色制备与应用教育部重点实验室,湖北武汉430062 [3]武汉理工大学光纤传感技术国家工程实验室,湖北武汉430072 [4]湖北宏钊建材有限责任公司,湖北麻城4383002 [5]江汉大学化学与环境工程学院,湖北武汉430056

出　　处：《化肥设计》2018年第6期5-9,16,共6页Chemical Fertilizer Design

基　　金：国家自然科学基金资助项目(51273154)

摘　　要：以硅橡胶(PDMS)为基体,以碳化硅、氮化硅为导热填料,通过热压法制备了系列陶瓷/PDMS复合材料,并对其导热性能、介电性能进行测试,结果表明,在导热填料/硅橡胶复合材料中,当SiC/Si3N4=7∶3(体积比),且当填料占复合材料体积分数为15%时,其介电常数达到最高值9,是聚合物基体材料的3～4倍,介电损耗未发生明显改变,保持在0.05左右,击穿强度最大达到42kV/mm,热导率也达到了0.7W/(m·K)。为了提高导热复合材料的介电性能,在聚合物基体中,通过添加高介电性的钛酸钡陶瓷,制备出系列导热填料/介电陶瓷/硅橡胶三相复合材料,研究结果表明,当钛酸钡陶瓷占复合材料总体积的30%时,复合材料的介电常数提高约2倍,达到17,介电损耗仍保持较低水平,在0.07左右,击穿强度为25kV/mm,热导率达到0.72W/(m·K)。实验结果表明,通过在聚合物基体中添加导热填料和高介电陶瓷均能提高聚合物的介电性能,制备出具有高介电性和高导热性的聚合物基复合材料。Taking silicon rubber(PDMS)as the matrix and silicon carbide and silicon nitride as the thermal conductive filler,a series of ceramic/PDMS composites were prepared by hot pressing method,and their thermal conductivity and dielectric properties are tested.Results show that the thermal conductive filler/silicone rubber composites,when the SiC/Si3N4=7∶3(volume ratio),and when the filler volume fraction reaches15%of composite,the dielectric constant is the maximum9,which is3to4times that of the polymer substrate materials,without any obvious variation of dielectric loss which stays at around0.05,while the breakdown strength reaches its maximum42kV/mm and thermal conductivity is0.7W/(m·K).In order to improve the dielectric properties of thermal conductive composites,highly dielectric barium titanate ceramics are added into the polymer matrix to generate a series of thermal conductive filler/dielectric ceramics/silicon rubber three-phase composites.The research results shows that when barium titanate ceramics accounts for30%of the total volume of the composites,the dielectric constant of the composites is increased by about2times to17,and the dielectric loss of the composites remains at a low level,at about0.07,the breakdown strength is25kV/mm,and the thermal conductivity reaches0.72W/(m·K).The experimental results show that the polymer matrix composites with high dielectric and thermal conductivity can be prepared by adding thermal conductive filler or high dielectric ceramic into the polymer matrix to improve the dielectric properties of the polymer.

关 键 词：导热硅橡胶 氮化硅 碳化硅 介电性能 钛酸钡 

分 类 号：TQ327.8[化学工程—合成树脂塑料工业]