Study On The Spectral Radiant Characteristics Of Carbon Nanomaterial Coating

With the rapid progress of high and new technology,the development of electronic vital parts tends to be centralized and miniaturized.The power per unit volume of the electronic vitality increases,the heat production increases,and the convection heat dissipation decreases.The electronic vitality parts working in a high temperature environment exceeding its own limit for a long time will cause its performance to decrease or even damage.Aiming at the problem of heat dissipation in the narrow space of electronic vitality parts,this article starts from increasing its surface emissivity,and uses the method of combining carbon nano particles(carbon nanotubes,graphene)and dispersion mechanism to obtain a high emissivity coating,which improves the radiation heat dissipation performance.To achieve the purpose of heat dissipation.Analyze the factors affecting the spectral radiation characteristics of carbon nanotube coatings and graphene coatings.This paper uses simulation methods to study the radiation characteristics of carbon nanotube coatings and graphene coatings,providing choices and material references for actua l experiments and applications,and analyzing carbon The influence of the volume fraction,diameter,length or number of layers,and arrangement of nanotube coating and graphene coating on the spectral radiation characteristics.Through simulation,the car bon nanomaterials to be selected are determined,and the carbon nanoparticle coatings studied are designed and prepared.The experimental measurements respectively measured the radiation characteristics of the selected carbon nanotube coating and graphene coating in the 0.3?m-15.4?m waveband,and compared the thickness of the coating,the mass percentage concentration of carbon nanoparticles in the coating,and the two selected carbons.The influence of nanoparticles on the radiation characteristics of the spectrum,and the thickness and mass percentage concentration have a certain regular influence on the radiation characteristics of the coating.Comparing the coatings studied in this paper with the existing commonly used anodic oxidation and blackening anodic oxidation,the total emissivity of the coating obtained in this paper is greater than that of anodic oxidation and blackening anodic oxidation.Based on the finite-difference time-domain method to simulate the spectral radiation characteristics of the multi-walled carbon nanotube coating,it is found that the smaller the diameter,the longer the length,and the greater the volume fraction of the multi-walled carbon nanotube coating,the greater its total emissivity.At the same time,the total emissivity of the multi-walled carbon nanotube coating with a staggered and horizontal structure in the horizontal direction is greater than the total emissivity obtained by the vertical arrangement.Simulating the graphene coating,when the number of graphene layers reaches 100,the total emissivity gradually decreases as the number of layers increases.The volume fraction of the graphene coating has the same effect on the emissivity as carbon nanotubes.Through the preparation of carbon nanotube coatings and graph ene coatings and the experimental measurement of the spectral radiation characteristics,this paper obtains the influence of the thickness of the coating and the mass percentage concentration of carbon nanoparticles in the coating on the radiation characte ristics.The carbon nanoparticle and the dispersion mechanism are similar.In combination,the maximum average emissivity in the 0.3-15.4?m band is 0.9734,which is 6.5times that of aluminum 6061.Compared with the commonly used surface black anodizing process,it is 2.1 times of its flat emissivity,which is comparable to surface anodizing.In comparison,its average emissivity is 3 times.The obtained coating has a high emissivity in the studied wavelength range of 0.3-15.4?m,and the maximum emissivity is 0.9915.