摘要
以不同形貌的铝粉为原料,通过冰模板法预先构建了含铝原料骨架,经原位氮化反应烧结将含铝原料骨架一步转变为氮化铝骨架,随后通过真空浸渗法制备了导热环氧树脂/氮化铝(EP/AlN)复合材料。主要研究了片状铝粉和球状铝粉的比例对AlN骨架的物相成分和显微结构及EP/AlN复合材料热学性能的影响。结果表明,改变片/球比对AlN骨架物相成分的影响小,在AlN总体积分数为40%、片/球体积比为1∶9时,从复合材料断裂截面的EDS图观察到AlN在EP中呈连续定向层状排列,最终复合材料获得3.035 W/(m·K)的最大热导率,比纯EP提高了1517.5%。通过在运行温度为90℃的加热台上散热效果表明,该复合材料基板相比于纯EP基板显示出更优异的散热性能。同时在90,120,150℃的不同环境温度下的测试表明,随温度升高复合材料基板的散热效果增强。
Using Al powder with different morphology as raw material,the Al-containing raw material framework was constructed by ice template method in advance,and the Al-containing raw material framework was transformed into AlN framework in one step by in-situ nitriding reaction sintering.Subsequently,the thermal conductive EP/AlN composites were prepared by vacuum infiltration method.The effects of the ratio of flake Al powder to spherical AlN powder on the phase composition,microstructure and of AlN framework and the thermal properties of EP/AlN composites were studied.The results show that the phase composition of AlN framework is not affected by the change of the flake-sphere ratio.When the integral number of AlN is 40vol%and the volume ratio of flake to sphere is 1∶9,the AlN is continuously oriented and layered in EP,and the maximum thermal conductivity of the composite is 3.035 W/(m·K),which is 1517.5%higher than that of the pure EP.The heat dissipation effect of the composite substrate on the heating table with the operating temperature of 90℃shows that the composite substrate has better heat dissipation performance than pure EP substrate.At the same time,the tests at different ambient temperatures of 90,120,150℃show that the heat dissipation effect of the composite substrate increases with the increase of temperature.
作者
伍良晴
Wu Liangqing(College of Materials Science and Engineering,Hainan University,Haikou 570228,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2022年第6期49-53,共5页
Engineering Plastics Application
基金
国家自然科学基金重大项目(51790173)
江苏省基础研究计划-前沿引领技术基础研究专项(BK20212007)。
关键词
原位氮化
氮化铝
环氧树脂
热导率
散热性能
in-situ nitriding
AlN
epoxy resin
thermal conductivity
heat dissipation performance
