Gradient interface modified aluminum oxide-aluminum nitride two-component heat-conducting filler and preparation method thereof

By modifying the alumina-alumina nitride bicomponent thermally conductive filler through gradient interface modification, the problems of limited improvement of alumina thermal conductivity and easy hydrolysis failure of aluminum nitride were solved. A highly efficient thermally conductive network was constructed, which significantly improved thermal conductivity and stability, while reducing costs.

CN121379207APending Publication Date: 2026-01-23GUANGDONG LETTO NEW MATERIALS CO LTD
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Patent Information

Application Number
CN202511454821.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-13
Publication Date
2026-01-23

AI Technical Summary

Technical Problem

Among existing thermal interface materials, the thermal conductivity of alumina is limited, aluminum nitride is prone to hydrolysis and failure, and existing technologies fail to fully utilize the multiple interface control requirements between fillers and the matrix, resulting in interfacial phonon scattering and long-term stability issues at high filler contents.

Method used

A gradient interface modified alumina-alumina nitride two-component thermally conductive filler is adopted. Through the morphological synergy of spherical alumina and plate-like aluminum nitride, combined with double-layer gradient silanization modification and aluminum nitride hydrolysis protection, an efficient thermally conductive network is constructed and the long-term stability is improved.

Benefits of technology

It achieves a 3 to 4-fold increase in thermal conductivity, a more than 30% reduction in viscosity, in-depth control of interfacial thermal resistance, improved long-term stability, and a 35% to 45% reduction in raw material costs.

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Abstract

The invention belongs to the field of heat conduction materials, and particularly relates to gradient interface modified aluminum oxide-aluminum nitride bi-component heat conduction filler and a preparation method thereof, and the gradient interface modified aluminum oxide-aluminum nitride bi-component heat conduction filler comprises spherical aluminum oxide, flaky aluminum nitride and double gradient modified layers coating the surfaces of the spherical aluminum oxide and the flaky aluminum nitride; the D50 of the spherical aluminum oxide is 2-5 microns, and the sphericity is greater than or equal to 0.85; the sheet-shaped aluminum nitride is in a hexagonal sheet shape, the average particle size is 8-12 microns, the thickness is 200-500 nanometers, and the radius-thickness ratio is 20-50; the mass ratio of the spherical aluminum oxide to the flaky aluminum nitride is (40-70): (30-60); the double-layer gradient modification layer comprises an inner-layer hydrophobic silane layer and an outer-layer reactive silane layer, the inner-layer hydrophobic silane layer is formed by grafting alkyl trialkoxy silane with the carbon chain length of 8-16, the outer-layer reactive silane layer is formed by grafting a silane coupling agent containing an epoxy group or an amino group, and morphological complementary optimization of a filler network is achieved.
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