A flexible thermal interface material with high thermal conductivity for large-scale production.
Jan 08,2024
Network
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Background Introduction
With5GEquipment is rapidly developing in the direction of integration and miniaturization, and higher power density requires stronger heat dissipation capacity. High-efficiency heat dissipation materials require high thermal conductivity, good mechanical properties and electrical insulation properties, and low interfacial thermal resistance. Although a lot of efforts have been made to improve the thermal conductivity of polymer matrix by using materials such as high thermal conductivity graphene, carbon fiber and alumina, the development of high thermal conductivity composite materials with excellent electrical insulation properties and low interfacial thermal resistance is still a major challenge.
boron nitride nanosheets(BNNS)Has a hexagonal crystal structure similar to graphene with ultra-high theoretical in-plane thermal conductivity(1700-2000 W/mK)and out-of-plane thermal conductivity(1 - 30 W/mK)and excellent dielectric insulation properties. However, there is currently no successful implementation of large-scale and cost-effectiveBNNSmanufacturing, impedingBNNSDevelopment of composite materials. In order to useBNNSSeveral methods have been used to enhance the thermal conductivity of the polymer matrix, such as freeze casting, electrospinning and hot pressing. However, due to the difficulty of constructing an effective heat transfer channel, at lowBNNSIt is still challenging to effectively improve the thermal conductivity under load. In particular, the currentBNNSStripping and composite manufacturing strategies are not sufficient for large-scale industrial manufacturing.
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Results Glimpse
Recently, Yu Jinhong, Ningbo Institute of Materials, Chinese Academy of Sciences, Jiangnan Team and Ningbo UniversityPan ZhongbinProfessor for large-scale preparation.BNNsThe technology has made the latest progress, and a reasonable composite strategy is proposed, which can effectively improve the thermal conductivity of composite materials, while promoting large-scale production.In this paper, through the reasonable introduction of up1200 WThe ultra-high power strong ultrasonic treatment is achieved by using a novel stripping method.BNNSlarge-scale production. through5cycle to get about32grams of high qualityBNNS. Preparation of polydimethylsiloxanePDMS/ BNNScomposite materials in50 wt %ofBNNSUnder load, itsVsSignificantly enhanced3.82 W/mK, the interface thermal resistance is as low38 K mm2W,dielectric constantBelow3. This finding provides a basis for the large-scale production of high-qualityBNNSand heatinterface materialA promising avenue is provided to enhance heat transfer from the electrons to the heat sink.research results“Large-scale production of boron nitride nanosheets for flexible thermal interface materials with highly thermally conductive and low dielectric constant”Published in 《Composites Part B》。
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Graphic Guide
Figure1. Material preparation process and morphology and structure analysis.
Figure2. Schematic diagram of the preparation process of composite materials and the combination, macro and micro morphology.
Figure3. Thermal management performance parameters of composites.
Figure4. Mechanics, interfacial thermal resistance and dielectric properties of composites.
Figure5. Composite applications.
Figure6. Thermal management performance testing of composites.
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Hunan Enray Boron Nitride Sintering Furnace
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