Plasma modified carbon fiber reinforced anisotropic thermal conductive silica gel sheet and preparation method thereof

By performing plasma modification and directional alignment on carbon fibers, the problem of insufficient bonding strength between carbon fibers and silicone matrix was solved, achieving improved thermal conductivity and large-scale production, making it suitable for thermal management of electronic devices.

CN122103898APending Publication Date: 2026-05-29DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2026-04-13
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing technologies struggle to improve the interfacial bonding strength between carbon fibers and silicone matrix while maintaining the high thermal conductivity of carbon fibers, and it is also difficult to mass-produce anisotropic thermally conductive silicone sheets with uniform orientation.

Method used

Plasma-modified carbon fiber reinforced anisotropic thermally conductive silicone sheet was prepared by subjecting carbon fibers to plasma modification treatment with specific power and time in an oxygen atmosphere, combined with extrusion technology to orient the carbon fibers in a silicone matrix.

Benefits of technology

The method significantly improves the interfacial bonding strength between carbon fiber and silicone matrix at low addition levels, retains the graphite microcrystalline structure of carbon fiber, achieves improved thermal conductivity, and has a simple preparation method that is easy to scale up for production.

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Abstract

The application belongs to the technical field of thermal interface materials, and discloses a plasma-modified carbon fiber reinforced anisotropic thermal conductive silica gel sheet and a preparation method thereof. The surface of the carbon fiber is treated by a plasma treatment technology in the application, the surface activity is improved, the interface bonding performance between the carbon fiber and the silica gel matrix is enhanced, the graphite microcrystalline structure of the carbon fiber is retained, the graphite microcrystalline structure La of the carbon fiber is only reduced by 1.65 nm, the graphite microcrystalline structure Lc is only reduced by 1.9 nm, the ratio of I D / I G is only increased by 0.07, and the intrinsic thermal conductivity of the carbon fiber is retained. The plasma-modified carbon fiber is combined with an extrusion technology, the flow shear force in the extrusion helps the vertical orientation of the carbon fiber, the axial thermal conductivity of the carbon fiber is greater than the radial thermal conductivity, and the prepared carbon fiber can reach 31.13 W / (m·K) at a low addition amount of 13 wt%. The preparation method is simple, the raw materials are easy to process, and the production can be easily scaled up.
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