Citation: Zheng Liu, Zhou Jing, Shen Jie, Qi Yanyuan, Chen Wen. Effects on the thermal expansion coefficient and dielectric properties of CLST/PTFE filled with modified glass fiber as microwave material[J]. Chinese Chemical Letters, ;2019, 30(5): 1111-1114. doi: 10.1016/j.cclet.2018.12.026 shu

Effects on the thermal expansion coefficient and dielectric properties of CLST/PTFE filled with modified glass fiber as microwave material

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

zhoujing@whut.edu.cn

Received Date: 10 December 2018
Revised Date: 20 December 2018
Accepted Date: 20 December 2018
Available Online: 24 May 2018

Figures(5)

Ceramic and polytetrafluoroethylene composites as dielectric materials have a low dielectric loss at high frequency and play an important role in the modern communication field. However, room temperature phase transformation of PTFE resins, which is accompanied by a large volume change (> 400 ppm/℃), seriously affects the dimensional stability and performance stability of materials. The LD125 modified glass fiber (GF) was introduced to the CaO-Li₂O-Sm₂O₃-TiO₂ (CLST)/PTFE composite, to reduce the thermal expansion coefficient (CTE) of the composites. The tri-phase composites (CLST/PTFE/GF) show the low dielectric loss and excellent machine-ability. The effect of GF content on the dielectric properties and CTE was also investigated. The CLST/PTFE filled with 5% GF exhibits the best overall performance, which is a promising microwave dielectric material for microwave communication.
- Microwave communication,
- Thermal expansion coefficient,
- CLST,
- PTFE,
- Dielectric loss,
- Dielectric constant
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