Simulation Analysis Of Percolation Process Of Porous Graphite Impregnated With Antimony

Porous materials have superior properties such as high temperature resistance,corrosion resistance,and good structural performance.It is widely used in various industries.However,because of the large number of pores in it,the compactness is reduced,and the strength and hardness are not up to the requirements,so this article passes the experiment The acquisition of pore parameters constructs a finite element model of porous graphite close to the real pores,and explores the influence law and mechanism of the metal infiltration process of porous graphite,which contributes to the study of porous media percolation.main tasks as follows.(1)Analyze the pore structure of porous graphite samples through metallographic and EPMA microscopy to understand the distribution and composition of the pores,and obtain the complexity and randomness of the pores.Then process the slice photos obtained from the CT scan,reconstruct the porous graphite model using three-dimensional reconstruction processing technology,and compare the porosity of the two models after reconstruction with the real porosity.The errors are 1.83% and2.04%,respectively.,The finite element model of porous graphite reconstruction is more reasonable.(2)Porous graphite percolating metal antimony needs to be carried out under high temperature and high pressure.For the convenience of research,the temperature of the impregnated metal is selected to be two hundred degrees higher than its melting point.The melting point of metal antimony is 900 K,and the impregnation temperature is 1100 K.The physical parameters of the metal change with the change of temperature.According to the research,the infiltration angle of molten metal antimony at 1100 K is 140°,which means that the porous graphite is not infiltrated.Therefore,the impregnation process needs to be carried out under high pressure.The density of metal antimony at 1100 K It is 6.39g/cm3,the viscosity of the molten metal antimony is 1.45 m Pa S,and the heat transfer coefficient is 200w/(m2k),which provides reliable parameters for the finite element simulation study of porous graphite infiltration with metal antimony.(3)By the analysis of the three-dimensional reconstructed porous graphite finite element model,the simulation conditions at the inlet pressure of 0.5MPa,1MPa,3MPa,5MPa,and 8Mpa are analyzed respectively,and it is concluded that as the pressure increases,the outlet velocity is also When the inlet pressure is 3MPa,the outlet velocity is about 0.6m/s,and the increase is slow after 3MPa,which can basically achieve the effect of full impregnation.(4)By analyzing the simulation situation of porous graphite impregnated metal antimony at the inlet velocity of 0.1m/s,0.5m/s,1m/s,3m/s,5m/s,it is concluded that as the inlet velocity increases The better the simulation effect,the more stable the inlet velocity is between 3m/s-5m/s,and the best seepage effect can be achieved.(5)By analyzing the influence of model size on seepage flow,it is concluded that as the diameter of the model decreases,the outlet velocity will increase.When the model is large to a certain extent,the change of outlet velocity will be slow.In actual production,the pressure of the porous medium will be constant.The smaller the seepage effect,the better.(6)By analyzing the influence of the preheating temperature of different porous graphite on the percolation,the percolation conditions at the graphite temperature of1300 K,1100K and 900 K were simulated under the inlet pressure of 0.5MPa,and the preheating temperature of porous graphite and the temperature of antimony metal were obtained.When the same(1100K),the outlet velocity is the largest and the seepage effect is the best.The paper includes 66 figures,13 tables,and 101 references.