Microwave dielectric properties of SrAl2Si2O8 filled Polytetrafluoroethylene composites

3rd International Conference on New Material and Chemical Industry

材料科学;化学工业

Jiang, Z.H.^1 ; Yuan, Y.^1^2

State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Xiyuan Avenue, Chengdu

611731, China^1

Institute of Electronic and Information Engineering of UESTC in Guangdong, Dongguan, China^2

关键词: Constant temperature;    Low dielectric constants;    Low dielectric loss;    Microwave dielectric properties;    Microwave substrates;    Polytetrafluoroethylene (PTFE);    Polytetrafluoroethylene composites;    Silane coupling agent;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/479/1/012090/pdf
DOI  :  10.1088/1757-899X/479/1/012090

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The properties of Polytetrafluoroethylene (PTFE) filled with SrAl2Si2O8 (SAS) and alkali-free glass fiber (GF) were investigated. The content of GF is 1 vol. %, and the content of SAS varied form 10 vol. % to 50 vol. %. The SAS was modified by silane coupling agent to improve interaction between SAS and PTFE, and the composites were prepared through SMECH (include Sigma Mixing (SM), Extrusion (E), Calendering (C) and Hot pressing (H) ) process. XRD was used to testify the phase purity of SAS. FTIR was used to analyze the surface of modified SAS. The SAS/PTFE composite material exhibited a near-zero dielectric constant temperature coefficient (τ =5.1 ppm/°C) while achieving a low dielectric constant (r =3.21) and a low dielectric loss (tanδ=0.00136) at 40 vol. % SAS filling. The SAS/PTFE composites are potential candidates for microwave substrates applications.