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    Home > Chemicals Industry > Chemical Technology > Research progress on composite thermal network

    Research progress on composite thermal network

    • Last Update: 2021-06-21
    • Source: Internet
    • Author: User
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      The heat conduction network formed by Sinochem New Netcom's heat conduction filler is essential to improve the thermal conductivity of its composite materials
    .
    Recently, researchers from the School of Chemistry and Chemical Engineering of Northwestern Polytechnical University have designed and constructed a heat conduction network with controllable structure, density and distribution, and studied its influence on the thermal conductivity of composite materials from multiple angles, and enriched and perfected the thermal conduction mechanism of thermally conductive composite materials.
    Guiding its actual production has important theoretical significance and practical application value

    .

      Researchers prepared paraffin wax balls of different particle sizes with liquid nitrogen instantaneous cooling granulation technology.
    The surface of the paraffin wax balls was coated with graphite by the micro-melting method, and a controllable graphite heat conduction network was constructed between the paraffin phase interfaces, and then combined with the hot pressing process.
    Preparation of graphite/paraffin thermally conductive composite material

    .

      Subsequently, they controlled the density of the thermal network by changing the particle size of the paraffin balls, controlled the formation and improvement process of the thermal network by changing the amount of graphite, and controlled the thermal network by polishing the surface of the graphite/paraffin thermally conductive composite material, segmentation and reorganization, etc.
    The distribution and integrity of the thermal conductivity; and innovatively proposed the concept of "thermal conductivity network density" to explain the difference in thermal conductivity between different graphite/paraffin thermally conductive composite materials

    .

      Combining the thermal conductivity test results and the temperature gradient image of infrared thermal imaging, they also deeply explored the formation process of the graphite-graphite thermal network between the paraffin phase interface, and the density, distribution, and integrity of the thermal network to the graphite/paraffin thermally conductive composite The influence of the material's thermal conductivity
    .

      The research results show that under the same amount of graphite and molding pressure, the thermal network density of the graphite/paraffin thermally conductive composite has the best value and exhibits the best thermal conductivity
    .
    The thermal conductivity of the graphite/paraffin thermally conductive composite material with the same particle size paraffin balls increases with the increase of the thermal network density, but the rate of increase is gradually flat

    .
    Polishing the surface of the graphite/paraffin thermally conductive composite material will greatly reduce its thermal conductivity

    .
    In other words, the higher the thermal network density, the more uniform the thermal network distribution, and the more complete the thermal network, the better the thermal conductivity of the graphite/paraffin thermally conductive composite material

    .

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