Flexible and insulating silicone rubber composites with sandwich structure for thermal management and electromagnetic interference shielding

High integration development of electronics requires materials possessing excellent thermal conductivity, electromagnetic interference (EMI) shielding, and electrical insulation. In this work, Fe2O3 particles are deposited on carbon fibers (CF) and then utilized as fillers (CF@Fe2O3) in boron nitrid...

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Veröffentlicht in:Composites science and technology Jg. 219; S. 109253
Hauptverfasser: Guo, Yongqiang, Qiu, Hua, Ruan, Kunpeng, Wang, Shuangshuang, Zhang, Yali, Gu, Junwei
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Barking Elsevier Ltd 01.03.2022
Elsevier BV
Schlagworte:
Boron
Boron nitride
Carbon fibers
Central processing units
Composite materials
Cooling effects
CPUs
Electrical insulation
Electrical resistivity
Electromagnetic radiation
Electromagnetic shielding
Electromagnetics
Electronics
EMI shielding
Heat conductivity
Heat transfer
Sandwich structures
Sheaths
Silicone resins
Silicone rubber
Silicone rubber composites
Substrates
Thermal conductivity
Thermal management
Silicone rubber composites
Thermal conductivity
Electrical insulation
EMI shielding
ISSN:0266-3538, 1879-1050
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Zusammenfassung:High integration development of electronics requires materials possessing excellent thermal conductivity, electromagnetic interference (EMI) shielding, and electrical insulation. In this work, Fe2O3 particles are deposited on carbon fibers (CF) and then utilized as fillers (CF@Fe2O3) in boron nitride/silicone rubber (BN/SR) to fabricate sandwich structured CF@Fe2O3/(BN/SR) composites, herein, BN/SR as top & substrate layer, and CF@Fe2O3 as middle layer. Orientation of BN in CF@Fe2O3/(BN/SR) composites realizes excellent in-plane thermal conductivity coefficient (λ∥), and the core-sheath structure of CF@Fe2O3 achieves good EMI shielding performance by the “absorption-reflection (transmittance)-reabsorption” process of electromagnetic waves, insulation modification of CF and the sandwich structure strengthen the electrical insulation. When the amount of BN and CF@Fe2O3 are 20.6 wt% and 45.5 wt%, respectively, the λ∥, EMI shielding effectiveness, volume resistance and breakdown strength of CF@Fe2O3/(BN/SR) composites reach 3.86 W/(m·K), 37.7 dB, 6.2 × 1014 Ω cm and 26.8 kV/mm, respectively, which are all higher than those of commonly fabricated CF/(BN/SR) composites with same amount of BN and CF (3.83 W/(m·K), 19.4 dB, 8.6 × 1013 Ω cm and 21.4 kV/mm). CF@Fe2O3/(BN/SR) composites possess better cooling effect (5.6 °C) than that of commercial silicon grease (QM850) on the testing platform of computer's central processing unit, whose functions are more abundant and have wide application prospects in electronics. [Display omitted] •Designing core-sheath CF@Fe2O3 to enhance electromagnetic interference (EMI) shielding and reduce electrical conductivity of carbon fiber (CF).•Realizing orientation of boron nitride to enhance the in-plane thermal conductivity.•Silicone rubber composites possess excellent thermal conductivity, EMI shielding and insulating performances.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2021.109253