Boron Nitride‐Based Paint with High Heat Dissipation Performance

Abstract

In order to increase heat dissipation efficiency of the heat sink, heat dissipating paint using hexagonal boron nitride (hBN) as a thermal conductive additive is designed and evaluated. The adhesion strength of the heat dissipating paint onto the aluminum (Al) plate is confirmed by the cross‐cut adhesion test method (ISO 2409). The ratio of detachment of the coating film from the Al plate is observed to be 5% or less and, from the resultants, it is found that the adhesion strength of the hBN‐based heat dissipation paint is excellent. The heat dissipation performance of the heat dissipating paint is determined by the temperature difference between the paint coated Al plate and the unpainted Al plate when the heat generated from the heat source is transferred to the around through the Al plate. The hBN‐based heat dissipating paint has the effect of lowering the temperature of the Al plate by 6 °C or more, and the heat dissipation performance of the paint tends to gradually increase with time. When the thickness of the coating film is reduced by about 20%, the heat dissipation performance is improved by more than 50%. As a result, the hBN‐based heat dissipating paint is able to achieve heat dissipation performance of more than 10 °C.