磁场诱导纳米四氧化三铁修饰型片状氧化铝制备导热绝缘复合材料  

Preparation of thermal conductive insulating composites by magnetic field induced orientation of nano Fe_(3)O_(4) modified flake alumina

作　　者：徐庆崇 覃意深 陈振兴 胡佳馨[1] 廖妍玲 刘永锋 李龙 魏世洋 XU Qingchong;QIN Yishen;CHEN Zhenxing;HU Jiaxin;LIAO Yanling;LIU Yongfeng;LI Long;WEI Shiyang(School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519082, China;School of Chemistry and Environment, Jiaying University, Meizhou 514015, China;The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province,Sun Yat-Sen University, Guangzhou 510275, China)

机构地区：[1]中山大学化学工程与技术学院,广东珠海519082 [2]嘉应学院化学与环境学院,广东梅州514015 [3]中山大学广东省低碳化学与过程节能重点实验室,广州510275

出　　处：《功能材料》2022年第6期6200-6204,6211,共6页Journal of Functional Materials

基　　金：梅州市科技计划项目(2019B0203001)。

摘　　要：利用钕铁硼永磁场诱导环氧树脂(E20)中纳米四氧化三铁修饰片状氧化铝取向偏转,研究了磁场强度、诱导时间,四氧化三铁与氧化铝质量比以及填料填充率对复合材料导热性能的影响,并分析了复合材料的绝缘强度、热稳定性及其覆铜板剥离强度。Al_(2)O_(3)@Fe_(3)O_(4)/E20复合材料的导热系数随磁场强度的增大而增大。磁场诱导时间超过60 min时,复合材料的导热系数基本恒定。复合材料的导热系数随四氧化三铁与氧化铝质量比的增加而增加,但考虑到复合材料的绝缘性,四氧化三铁包覆量不宜过大。在磁场强度为120 mT、诱导时间为60 min、四氧化三铁与氧化铝质量比为1/30、Al_(2)O_(3)@Fe_(3)O_(4)复合粒子填充率为70%(质量分数)时,复合材料的导热系数为1.45 W/(m·K),比片状Al_(2)O_(3)填充的复合材料高34.26%。Al_(2)O_(3)@Fe_(3)O_(4)/E20复合材料质量损失5%对应的温度达366℃,覆铜板剥离强度>1.74 N/mm。Induced orientation of nano Fe_(3)O_(4) modified flake alumina particles in epoxy resin(E20)were investigated under the NdFeB permanent magnetic field and the effects of magnetic field strength,induction time,mass ratio of Fe_(3)O_(4) to alumina and filler filling rate on the thermal conductivity of the composites were studied together with the insulation strength,thermal stability of composites and the peel strength of its copper clad laminate.The thermal conductivity of the Al_(2)O_(3)@Fe_(3)O_(4)/E20 composites can be improved with the increase of magnetic field strength.When the induction time of magnetic field is more than 60 min,the thermal conductivity of the composites is almost constant.The thermal conductivity of the composites can be improved through increasing the mass ratio of Fe_(3)O_(4) to alumina.However,considering the insulation of the composites,the Fe_(3)O_(4) coating amount should be controlled.Under the conditions of magnetic field intensity 120 mT,induction time 60 min,mass ratio of Fe_(3)O_(4)to alumina 1/30 and filling rate of flaky Al_(2)O_(3)@Fe_(3)O_(4) composite particles 70 wt%,the thermal conductivity of flaky Al_(2)O_(3)@Fe_(3)O_(4) composites is 1.45 W/(m·K),which is 34.26%higher than that of the flaky alumina particles filled composites.The temperature corresponding to 5%mass loss of the composite is 366℃and the peel strength of copper clad laminate is greater than 1.74 N/mm.

关 键 词：导热绝缘复合材料 磁场 诱导取向 

分 类 号：TB33[一般工业技术—材料科学与工程]