CN-121975369-A - Anisotropic heat-conducting high-reflection coating composition and application thereof

Abstract

The invention belongs to the technical field of inorganic composite coating materials, and provides an anisotropic heat-conducting high-reflection coating composition and application thereof, wherein the coating composition consists of hexagonal boron nitride nano-sheets and low-melting-point glass powder, the mass ratio of the hexagonal boron nitride nano-sheets to the low-melting-point glass powder is 1:7-15, and the melting point of the low-melting-point glass powder is 300-400 ℃.

Inventors

• DONG HAN
• MA CHEN

Assignees

• 华侨大学

Dates

Publication Date

20260505

Application Date

20260404

Claims (9)

1. 1. The anisotropic heat-conducting high-reflection coating composition is characterized by comprising hexagonal boron nitride nano-sheets and low-melting-point glass powder, wherein the mass ratio of the hexagonal boron nitride nano-sheets to the low-melting-point glass powder is 1:7-15, and the melting point of the low-melting-point glass powder is 300-400 ℃.
2. 2. The coating composition of claim 1, wherein the hexagonal boron nitride nanoplatelets have a diameter of 0.5-3 μm and a thickness of 20-50 nm.
3. 3. The coating composition of claim 1, wherein the mass ratio of the hexagonal boron nitride nanoplatelets to the low melting glass frit is 1:8-12.
4. 4. A process for the preparation of an anisotropic thermally conductive highly reflective coating, characterized in that the coating is prepared using a coating composition according to any one of claims 1 to 3, the process comprising: respectively carrying out ball milling pretreatment on the hexagonal boron nitride nanosheets and the low melting point glass powder; Adding the ball-milled hexagonal boron nitride nanosheets and the ball-milled low-melting-point glass powder into a dispersion medium, and performing dispersion treatment to obtain uniform slurry; And coating the slurry on the surface of a substrate, drying, heating to a temperature above the melting temperature of the low-melting-point glass powder, and preserving heat to enable the low-melting-point glass powder to be melted to form a compact coating with a glass phase coating the hexagonal boron nitride nano-sheet, and naturally cooling to room temperature to obtain the coating.
5. 5. The method according to claim 4, wherein the substrate is selected from stainless steel plate, aluminum alloy plate or resin-based composite plate, and surface pretreatment is performed before coating.
6. 6. The method of claim 4, wherein the coating thickness is 450-700 μm.
7. 7. The method of claim 6, wherein the coating thickness is 540-570 μm.
8. 8. Use of a coating composition according to any one of claims 1-3 for the preparation of a radiation refrigerating material.
9. 9. Use of a coating composition according to any one of claims 1-3 for the preparation of a high energy laser protective material.

Description

Anisotropic heat-conducting high-reflection coating composition and application thereof Technical Field The present disclosure relates to an anisotropic heat conductive highly reflective coating composition and applications thereof, which belongs to inorganic composite coating materials. Background With the rapid development of high-energy laser technology, the application of the high-energy laser technology in the fields of industrial processing, military protection, photoelectricity and the like is increasingly wide. When high-energy laser acts on the surface of a material, a large amount of heat can be generated in a very short time, so that the local temperature is rapidly increased, and further melting, ablation and even structural failure are caused, and therefore, higher requirements are put forward on the laser protection performance of the material. At the same time, the material surface also suffers from heat accumulation under natural environment and high heat load conditions. The radiation refrigeration is used as a passive cooling mode without external energy input, and continuous heat dissipation is realized through the reflection of the reinforcing material on sunlight and the infrared radiation capability of the reinforcing material on the atmospheric window wave band, so that the radiation refrigeration device has good application prospect. Therefore, in a part of extreme service environments, the material not only needs to have the capability of resisting high-energy laser irradiation, but also needs to have the effective passive heat dissipation capability, so that the requirement for the laser protection and radiation refrigeration integrated functional coating is induced. Currently, research on high-energy laser protection is mainly focused on constructing a high-reflectivity coating or adopting a high-temperature-resistant ceramic material so as to reduce laser energy absorption and improve the thermal damage resistance of the material. However, during continuous irradiation of high-energy laser light, laser energy is highly concentrated in localized areas, which is prone to heat build-up, and localized melt fracture may occur even if the material has a high reflectivity. Meanwhile, the existing high-temperature resistant material has defects in the aspect of heat conduction regulation and control, and the problem of thermal stress caused by temperature gradient is difficult to effectively relieve. On the other hand, radiation refrigeration coatings have been widely studied in recent years in the directions of coatings, films, composite materials and the like, and the reflectivity of the materials in sunlight bands and the emission capacity in the atmospheric window range are improved by introducing high-refractive-index scattering particles or infrared emission components, so that the cooling effect is realized. However, the materials focus on optical performance regulation, have defects in structural design and thermal conduction regulation, and have less research on stability and protection capability under the condition of high-energy laser irradiation. In general, there is no composite coating system capable of simultaneously combining high-energy laser protection and radiation refrigeration performance in the prior art. In summary, although the existing material systems have advanced in the fields of laser protection or radiation refrigeration, respectively, there are still significant shortcomings in satisfying two functions at the same time, and in particular, effective unification in the aspects of coating structure design and thermal conduction behavior regulation has not been achieved. Therefore, development of a composite coating with high-energy laser protection and radiation refrigeration performance is needed to improve the comprehensive service performance of the material under the complex thermal environment and laser irradiation conditions. Disclosure of Invention The present disclosure provides an anisotropic heat conductive highly reflective coating composition and application thereof, which can effectively solve the above-mentioned problems. The present disclosure is implemented as follows: In one aspect, the present disclosure provides an anisotropic thermally conductive highly reflective coating composition comprised of hexagonal boron nitride nanoplatelets and a low melting glass frit, wherein the mass ratio of the hexagonal boron nitride nanoplatelets to the low melting glass frit is from 1:7 to 15, the low melting glass frit having a melting point of from 300 ℃ to 400 ℃. In another aspect, the present disclosure provides a method for preparing an anisotropic thermally conductive highly reflective coating, the coating prepared using the coating composition described above, the method comprising: respectively carrying out ball milling pretreatment on the hexagonal boron nitride nanosheets and the low melting point glass powder; Adding the ball-milled hexagonal b