For high-energy lasers, researchers have designed metal or ceramic coatings with high reflectivity.
Such coatings exhibit special characteristics depending on the features of the heat source. Protective coatings have successfully been prepared on the surfaces of metal substrates.
This study effectively expands the application range of high-conductive film, and the obtained coating could act as a shield against butane flame, high energy lasers, and other localized heat. The synergy of these two different characteristics is demonstrated to be the key to improving the localized heat-resistant performance of the composite coating. The layer-by-layer structure could realize the compatibility of high in-plane thermal conductivity and good through-plane thermal insulation. In addition, the area of the ablation-affected region of coating was increased to 103.6 cm 2 from 31.9 cm 2, indicating an excellent heat transfer performance. This characteristic of the rGO/PVA film was combined with the thermal insulation of boron-modified phenolic resin (BPF), and the prepared composite coating with two layers of rGO/PVA films effectively lowered the back-surface temperature in the flame ablation test from 151 to 107 ☌.
Reduced graphene oxide (rGO) effectively improved the in-plane thermal conductivity of the polyvinyl alcohol (PVA) film, while maintaining the thermal insulation of the resin matrix in the through-plane direction. In this study, a novel localized heat-resistant coating with a high in-plane thermal conductivity was designed and prepared. Localized heat sources, such as flame guns and high-energy lasers, can cause severe damage to conventional materials.
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