CaCu_3Ti_4O_(12)/P(VDF-TrFE)复合材料的制备和介电性能研究  

Preparation of CCTO/P(VDF-TrFE) Bulk Composites and Study on Its Dielectric Properties

作　　者：任新苗 倪磊[1] 段理[1] 苏媛 REN Xinmiao;NI Lei;DUAN Li;SU Yuan(College of Materials Science and Engineering,Chang'an University,Xi'an 710064,Shaanxi,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064

出　　处：《西安石油大学学报（自然科学版）》2018年第2期94-99,共6页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家自然科学基金(51301023);西北工业大学凝固国家重点实验室开放基金(2014031140419)

摘　　要：采用固相法制备了微米级CaCu_3Ti_4O_(12)(CCTO)粉体,将CCTO粉体作为填料与P(VDF-TrFE)(摩尔比为70/30)共聚物进行热压复合,主要研究了热压温度和CCTO填料含量对CCTO/P(VDF-TrFE)复合材料的微结构和介电性能的影响。CCTO/P(VDF-TrFE)复合材料中CCTO粉体较均匀地分散于P(VDF-TrFE)共聚物中,形成0-3型复合。随着热压温度的升高,P(VDF-TrFE)基体对CCTO陶瓷颗粒的包覆性增强,结合更紧密。随着CCTO体积分数的增加,CCTO/P(VDF-TrFE)复合材料的介电常数和介电损耗都有所增大,主要分别源于界面极化和填料自身较高的介电损耗。随着热压温度的升高,CCTO添料与P(VDFTrFE)共聚物结合更紧密,界面缺陷减少,复合材料的介电常数逐渐增大。而其介电损耗在一定的频率范围内随热压温度的升高变化不大。当CCTO体积分数为50%、热压温度为140℃时,CCTO/P(VDF-TrFE)复合材料介电性能最优。不同的复合材料介电理论模型对比表明,Yamada模型与实验数值重合度最高,可有效地预测CCTO/P(VDF-TrFE)复合材料的介电增强现象。CaCu 3Ti 4O 12(CCTO)ceramic particles were prepared by solid phase reaction method,and using CCTO as filler and P(VDF-TrFE)(mole ratio 70/30)copolymer as matrix,CCTO/P(VDF-TrFE)composite was prepared by hot pressing method.The effects of hot pressing temperature and CCTO volume fraction on the microstructure and dielectric property of CCTO/P(VDF-TrFE)composite were studied.CCTO particles homogeneously disperse in the composite,which forms 0-3 type structure.With the increasing of hot press temperature,the enwrapping of P(VDF-TrFE)matrix to CCTO ceramic particles is closer.With the increasing of CCTO volume fraction,the dielectric constant and dielectric loss of CCTO/P(VDF-TrFE)composite increase,which is because of interfacial polarization and higher dielectric loss of CCTO filler respectively.With the increasing of hot pressing temperature,the dielectric constant of CCTO/P(VDF-TrFE)composite increases,which may be becaues the closer combination of CCTO filler with P(VDF-TrFE)matrix results in the decreasing of interfacial defects.However,in a certain frequency range,the dielectric loss of CCTO/P(VDF-TrFE)composite changes slightly with the increasing of hot pressing temperature.The dielectric property of the prepared CCTO/P(VDF-TrFE)composite is the best when hot pressing temperature is 140℃and the volume fraction of CCTO filler is 50%.The comparison of different dielectric models of composite shows that the coincidence degree of Yamada model is the highest to experimental values,which can be used for the prediction of the dielectric property of CCTO/P(VDF-TrFE)composite.

关 键 词：CCTO/P(VDF-TrFE)复合材料 介电性能 热压温度 Yamada模型 

分 类 号：TM22[一般工业技术—材料科学与工程] TB33[电气工程—电工理论与新技术]