PTFE基复合材料的制备与介电性能研究.doc

文档介绍：
PTFE 基复合材料的制备与介电性能研究#
杨文财1,沈杰1,2**
(1. 武汉理工大学材料科学与工程学院,武汉,430070;
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2. 武汉理工大学特种功能材料教育部重点实验室,武汉,430070)
摘要:本文选择具有高介电常数且温度稳定性较好的 16CaO-9Li2O-12Sm2O3-63TiO2(CLST)陶瓷作为功能
相,采用溶剂混合法制备 xCLST/(1-x)PTFE 复合材料,分析陶瓷含量对复合材料结构与性能的影响。结果
表明,随陶瓷含量的增加,复合材料结构由单一基体连通形式,转变为两相连通且出现了较多孔隙和陶瓷
团聚。复合材料介电常数随陶瓷含量增加增大,在陶瓷含量达 50%后趋势变缓,介电损耗在陶瓷含量达到
40wt%后急剧增加,陶瓷相的加入有效的改善了复合材料的温度稳定性。采用三相 EMT 模型拟合分析了介
电常数的变化,复合材料介电性能与热稳定性受组分含量和两相连通结构所决定。
关键词:PTFE 基复合材料;微波介电性能;填充改性
中图分类号: TB332
Preparation and Characterization of Microwave Dielectric
Properties of PTFE/posites
YANG Wencai1, SHEN Jie1,2
(1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan
430070;
2. Key Laboratory of Advanced Technology for Specially Functional Materials, Wuhan University
of Technology, Wuhan,430070)
Abstract: The posites, xCLST/(1-x) PTFE, were prepared by mixed solvent method,
with 16CaO-9Li2O-12Sm2O3-63TiO2 (CLST) dielectric ceramic as the functional filler. The effect of
filler content on structure and dielectric properties were studied. The results showed that the
microstructure of posites varied from matrix phase 3D structure to biphase 3D structure with
the content increasing, and the pores and ing out. As content increasing, the
dielectric constant increased steadily before x=50%, but after that point the upward trend slowed
down. While the d