陶瓷含量对BCZT/PVTC复合铁电薄膜的调控及电热强度的影响  

Effects of ceramic contents on regulation of BCZT/PVTC composite ferroelectric thin films and their electrothermal intensity

作　　者：孟祥睿[1] 汪守刚 龚彭真 马新灵[1] 魏新利[1] MENG Xiangrui;WANG Shougang;GONG Pengzhen MA Xining;WEI Xini(College of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001

出　　处：《高校化学工程学报》2023年第3期455-461,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：河南省科技攻关项目(182102210015)。

摘　　要：针对铁电聚合物材料电热制冷能力弱、需要高电场诱导极化等问题,在聚合物基体中引入高极化纳米陶瓷粉末,利用溶液浇铸法制备了陶瓷-聚合物复合铁电材料。通过微观结构表征、介电与铁电性能分析陶瓷掺杂量对复合材料整体性能的调控机制;利用唯象理论计算锆钛酸钡钙/聚偏氟乙烯-三氟乙烯-氯氟乙烯(BCZT/P(VDF-TrFE-CFE))复合材料在室温下的绝热温变以及电热强度。结果表明:当陶瓷质量分数大于12%时,会影响聚合物基体分散的均匀性,导致纳米颗粒发生团聚,引起漏电流效应。界面电荷的贡献以及陶瓷颗粒分散在聚合物基体中作为电荷核产生局部电场,进一步促进内部偶极子的翻转。在不同的陶瓷质量分数的复合材料中,当陶瓷质量分数为9%时,复合材料的电热性能最优,在35℃、电场强度为48 MV×m^(-1)时表现出4.36 K的高绝热温度变化,其电热强度可达0.091 K×m×MV^(-1)。Ferroelectric polymer materials have weak electrothermal cooling ability and need high electric field-induced polarization.In this study,high-polarization nano-ceramic powders were introduced into polymer matrices,and the ceramic-polymer ferroelectric composite materials were prepared by a solution casting method.The regulation mechanism of ceramic doping on the overall properties of composites was analyzed by microstructure characterization,dielectric and ferroelectric properties.Phenomenological theory was used to calculate adiabatic temperature changes and electrothermal intensity of BCZT/P(VDF-TrFE-CFE)composites at room temperature.The results show that ceramic doping contents over 12%can affect the dispersion uniformity of the polymer matrix,which leads to the agglomeration of nanoparticles,and cause current leakage effects.The contribution of interfacial charges and the dispersion of ceramic particles in the polymer matrix acted as charge nuclei to generate a local field that further promoted internal dipole inversion.The best electrothermal performance happened when the ceramic content was 9%,which showed a high adiabatic temperature change of 4.36 K at 35℃and a low electric field of 48 MV×m^(-1),with electrothermal intensity reached 0.091 K×m×MV^(-1).

关 键 词：电热制冷 纳米陶瓷 聚合物 电热强度 

分 类 号：TQ465.92[化学工程—制药化工]