A boron nitride / alumina composite film material, its preparation method and application

By adding alumina particles between boron nitride nanosheets to change their alignment and form vertical thermal conduction pathways, the heat dissipation problem of boron nitride materials in electronic devices is solved, achieving high thermal conductivity, simplifying the preparation process, and reducing costs.

CN118125828BActive Publication Date: 2026-05-26SUZHOU IND PARK MONASH RESEARCH INSTITUTE OF SCIENCE & TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SUZHOU IND PARK MONASH RESEARCH INSTITUTE OF SCIENCE & TECHNOLOGY
Filing Date
2024-01-23
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing boron nitride materials suffer from heat dissipation problems in electronic devices, especially due to limited through-surface thermal conductivity and high-temperature, high-pressure sintering conditions that restrict large-scale production, as well as high costs.

Method used

Alumina particles were used as space-occupying additives to change the arrangement and orientation of boron nitride nanosheets, forming vertical thermal conduction pathways. Boron nitride/alumina composite membranes were prepared by simple mixing, filtration and rapid sintering.

Benefits of technology

The thermal conductivity of boron nitride/alumina composite films was significantly improved, the cost was reduced, the preparation process was simplified, the sintering efficiency was improved, and the mechanical properties of the composite films were enhanced.

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Abstract

A boron nitride / alumina composite membrane material, its preparation method, and its application are disclosed. The steps are as follows: Alternating α-phase alumina powder of arbitrary morphology is dispersed with a nonionic surfactant in an organic solvent and ultrasonically dispersed using a cell disruptor to obtain an alumina dispersion. Boron nitride sheets, milling balls, and an organic solvent are mixed and milled. The resulting slurry is dispersed in the organic solvent to obtain a milling liquid dispersion. The milling liquid dispersion is ultrasonically dispersed using a cell disruptor to obtain a boron nitride dispersion. The alumina organic dispersion and the boron nitride organic dispersion are mixed and then subjected to vacuum filtration, pressing, pre-sintering, and ultra-high temperature rapid sintering post-treatment. This invention uses alumina as a spatial occupant to alter the orientation of boron nitride, creating a certain through-surface thermal conductivity pathway within the boron nitride / alumina composite membrane material, significantly improving its thermal conductivity.
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