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Research Article | Open Access

Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence

Hao WANGa, Fuming ZHOUa, Jianming GUOa, Yuanyuan ZHANGb, Hui YANGa, Qilong ZHANGa( )
School of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
Jiaxing Glead Electronics Co., Ltd., Jiaxing 314003, China
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Abstract

Polymer-ceramic composites are widely applied in microwave substrate materials due to the excellent dielectric properties and simple preparation process recently. Polytetrafluoroethylene-based (PTFE) composites filled with Zn0.5Ti0.5NbO4 (ZTN) ceramic particles were fabricated by hot-pressing. The particles were modified by C14H19F13O3Si to enhance the interface compatibility between PTFE and ZTN powders, which was characterized by X-ray photoelectron spectroscopy (XPS) and contact angle. The surface characteristic of particles transformed into hydrophobicity and tight microstructure as well as better dielectric properties were obtained after the surface modification. The microstructure, dielectric, thermal, mechanical properties, and water absorption of the composites concerning ZTN content were investigated. Modified ZTN/PTFE composites with 50 vol% ZTN particles exhibit excellent dielectric properties with a high dielectric constant of 8.3, an extremely low dielectric loss of 0.00055 at 7 GHz, and a stable temperature coefficient of the dielectric constant of -12.2 ppm/℃. All the properties show modified ZTN particles filled PTFE composite is the potential material for microwave substrate application.

Keywords

compositesdielectric propertiesniobiumsubstrate

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Journal of Advanced Ceramics
Volume 9 Issue 6,
December 2020
Pages 726-738
DOI: 10.1007/s40145-020-0409-2
Cite this article:
WANG H, ZHOU F, GUO J, et al. Surface-modified Zn0.5Ti0.5NbO4 particles filled polytetrafluoroethylene composite with extremely low dielectric loss and stable temperature dependence. Journal of Advanced Ceramics, 2020, 9(6): 726-738. https://doi.org/10.1007/s40145-020-0409-2

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Received: 16 April 2020
Revised: 19 June 2020
Accepted: 13 July 2020
Published: 27 November 2020
© The Author(s) 2020

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