Design Of New Type Graphite Radiator And SLS Integral Molding

With the development of information technology,the heating power of electronic devices is becoming larger and larger.If the temperature is too high,the working life and stability of electronic devices will be affected.Therefore,it is very important to study the heat dissipation of electronic components for the development of modern electronic technology.Graphite has excellent physical and chemical properties.It is in line with the development trend of light weight,high heat conduction and high temperature.As a substitute for metal radiator,graphite radiator has attracted great attention.Based on the technology of material adding,based on the design of new type graphite radiator structure and the formula of graphite 3D printing material,this paper makes use of the selective laser sintering technology to realize the whole forming of the complex graphite radiator,and explore the effective process measures to improve the thermal conductivity of the graphite radiator in order to obtain the high heat dissipation efficiency,the thermal conductivity and the mechanics.A new type of graphite radiator with good performance.Based on the theory of convection heat dissipation and the theory of temperature boundary layer,the model of a new type graphite radiator is obtained through the slit treatment of long fins and the rotation of small fins in the base model of the sun flower fin radiator.The finite element method is used to simulate the effect of the number of slit and the angle of field synergy on the heat dissipation of the new type of radiator,and the heat dissipation effect of the new and old two kinds of radiators is compared and studied.Considering the effect of the number of slit on the weight loss and heat dissipation of the radiator,the number of the new type of graphite radiator is 3,and the maximum temperature is 2.27 degrees lower than that of the basic model.Considering the effect of field synergistic heat dissipation,a new type of graphite radiator model and the heat dissipation effect of the basic model are compared.The results show that the field synergistic heat dissipation effect of the new type graphite radiator model is better under various synergistic angles.The temperature field of selective laser sintering was simulated by finite element method.The effects of laser power,scanning speed,scanning distance and layer thickness on the temperature field were studied.The internal rules were found,and the mechanism of selective laser sintering of graphite / phenolic resin mixed powder was revealed.Based on the heat conduction mechanism of composite materials,the composition of two kinds of3 D printing materials was designed from the angle of reducing the size of the pores and introducing the composition of high thermal conductivity component,and the experimental research was carried out.The 3D printing material with good molding process and good thermal conductivity was obtained by adding a proper amount of metal silicon powder on the basis of the raw material formula.Based on SLS technology,a new type of graphite radiator is manufactured quickly,and its structure and fineness characteristics are ensured.The effective measures to improve the thermal conductivity and mechanical properties of graphite radiators were studied.The effects of carbonization,vacuum pressure impregnation and high temperature in-situ reaction on the thermal conductivity of3 D printed samples were investigated,and the improvement mechanism of thermal conductivity was revealed.The enhancement of thermal conductivity of glassy carbon and silicon carbide as high thermal conductivity components was determined by carbonization and high-temperature in-situ reaction.The carbonization and high temperature in-situ reaction were carried out after impregnating the phenolic resin and silica sol of the sample.The results showed that the increase of the content of glass carbon and silicon carbide on the thermal conductivity.The final treatment process is: carbonization,two silica sol and high temperature in-situ reaction after impregnating two times phenolic resin.The thermal conductivity of the sample is 3.02 W/m K,and the strength is 27.11 MPa.