高性能BaTiO_3/PVDF介电复合材料及其薄膜电容器应用

Enhanced dielectric properties of BaTiO_3/PVDF composites and its film capacitor application

选用柔性高分子材料聚偏氟乙烯(PVDF)作为基体,纳米钛酸钡陶瓷(BaTiO3)作为填充相,采用简单的溶液共混以及流延工艺制备BaTiO3/PVDF薄膜。通过SEM观察了复合材料体系的微观结构,研究了BaTiO3/PVDF介电复合材料的介电性能。把所制备的BaTiO3/PVDF复合材料薄膜(70mm×30mm×25μm,电极面积:600mm2)加工成卷绕式薄膜电容器,研究了该电容器的电容、损耗、击穿电压以及温度稳定性等性能。结果表明,BaTiO3/PVDF复合材料具有良好的介电性能,其薄膜电容器性能优异,电容值为3.34nF,损耗低于0.03,在测试频率范围内保持稳定,击穿电压达到1.3kV,并且在100℃以内能保持良好的电容性能。

BaTiO3/PVDF（polyvinylidene fluoride） composites films,with PVDF as matrix,nanometer sized BaTiO3 as fillers,were prepared by a simple mix and casting process.The microstructure of the BaTiO3/PVDF composites were examined by SEM,and the dielectric properties of samples were discussed.BaTiO3/PVDF composites（film size： 70 mm×30 mm×25 μm,electrode area： 600 mm2） were applied in the film capacitors,and the key parameters of capacitor including capacitance,loss,thermal stability and breakdown voltage were tested.The results show that the BaTiO3/PVDF film capacitors have the good thermal stability below 100 ℃ and high breakdown voltage（1.3 kV）,while the capacitance can reach 3.34 nF and the loss is below 0.03.