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Abstract

Coefficient of thermal expansion (CTE) and dielectric constant for the SiO ₂/polytetrafluoroethylene (SiO ₂/PTFE) dielectric composite are mainly influenced by their filling content, and how to accurately predict the effect is still a great challenge untill now. In this work, the CTE and dielectric constant of SiO ₂/PTFE dielectric composite are systematically investigated by numerical simulation. The results show that with the increase of SiO ₂content, CTE of SiO ₂/PTFE dielectric composite decreases, and the dielectric constant increases, which are in good agreement with the data reported in the literature (Han K K, Zhou J, Li Q Z, Shen J, Qi Y Y, Yao X P, Chen W 2020 J. Mater. Sci. Mater. Electron. 319196 ). The 30% (volume fraction) solid SiO ₂sphere (SSS)/PTFE dielectric composite is the smallest CTE of 7.5×10 ^–5K ^–1, while 10% (volume fraction) hollow solid sphere (HSS)/PTFE possesses the smallest dielectric constant of 2.06. The CTE of SiO ₂/PTFE dielectric composite may decrease when the SiO ₂distribution is dense at the bottom. The large aspect ratio of SiO ₂filler may reduce CTE _xof SiO ₂/PTFE dielectric composite. The molding parameters have little effect on the thermal expansion coefficient of the solid SiO ₂/PTFE composite dielectric material. This work provides a clear insight into the controlling of CTE and dielectric constant of SiO ₂/PTFE dielectric composite by adjusting its microstructure.

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Corresponding author:Zhou Jing,zhoujing@whut.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 12174298), the Key Projects of Natural Science Foundation of Hubei Province, China (Grant No. 2019CFA044), the Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City, China (Grant No. 20201g0158), and the National Natural Science Foundation of Shenzhen City, China (Grant No. JCYJ20210324135002007).

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材料	PTFE	SiO₂	空气
密度ρ/(g·cm^–3)	2.10	2.20	—
热导率k/(W·m^–1·K^–1)	0.24	1.40	—
比热容c/(10³J·kg^–1·K^–1)	1.05	0.73	—
泊松比ν	0.40	0.22	0
杨氏模量E/GPa	0.28	70.0	—
CTE/(10^–6K^–1)	109	0.50	—
介电常数	2.05	3.50	1.00

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不同的分布情况	CTE/(10^–6K^–1)
1, 2, 3, 4分布10%; 5, 6, 7, 8分布20%	101.34
1, 2, 3, 4分布20%; 5, 6, 7, 8分布10%	96.78
1, 3, 4, 5分布20%; 2, 6, 7, 8分布10%	97.85
1, 3, 4, 6分布20%; 2, 5, 7, 8分布10%	98.05
1, 3, 4, 7分布20%; 2, 5, 6, 8分布10%	97.81
1, 3, 4, 8分布20%; 2, 5, 6, 7分布10%	97.80
1, 3, 5, 7分布20%; 2, 4, 6, 8分布10%	98.71
1, 3, 6, 8分布20%; 2, 4, 5, 7分布10%	99.09
1, 6, 7, 8分布20%; 2, 3, 4, 5分布10%	100.02

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Vol. 71, Issue 21 - 2022-11-05

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