Study On The Correlation Between Microstructure And Properties Of Porous Copper Fiber Sintered

Porous copper fiber sintered felt is a kind of new functional material with three-dimensional mesh fibrous skeleton structure and full interconnected pore structure.It is widely used in filtration and separation,catalytic reaction,fuel cell,sound absorption,gas diffusion and other fields with special features such as layered opening,controlled porosity,permeability and capillary action.In its research work,it is very important to analyze the correlation between the internal structure and the external performance,and realize the pre-design of the internal structure,which is of great significance to reduce the blindness of its actual manufacturing,improve the material processing efficiency and optimize the material performance.In this paper,the internal structure image information of porous copper fiber sintered felt was obtained by Micro-CT scanning firstly,and it was transformed into a digital three-dimensional model to realize the data statistics of its internal fiber morphology.Based on the morphological statistical results,a parameter control active design model is generated.Meanwhile,the unidirectional tensile test of the sintered copper rod was carried out,in order to achieve the basic performance of the porous copper fiber sintered felt and the basic parameters needed for the finite element analysis.The effect of grid division method and grid size on its simulation accuracy is considered.The simulation results of the tensile test are compared with the experimental data to verify the effectiveness of the model.The influence of the internal shape of the model on the tensile properties was obtained by fine-tuning the model.The simulation results show that,as the porosity decreases and the fiber orientation tends to the xy plane,the stress-strain curve of the porous metal fiber sintered felt is shifted upward,and the yield strength and Young's modulus rise.However,with the increase of fiber diameter,its tensile properties show a fluctuating change.The surface of the sintered felt model was optimized,and the simulation results were compared with the experimental results.It was proved that the optimized model improved the accuracy of the simulation.The numerical simulation of fluid velocity distribution and pressure drop distribution in the optimized model is carried out under different structural characteristics and boundary conditions.The effects of different boundary conditions and porosity on the fluid transport properties of porous copper fiber sintered felt were investigated.The simulation results show that the unique internal network structure of the porous copper fiber sintered felt has a significant enhancement effect on the flow velocity of the internal fluid,and the enhancement is enhanced with the decrease of the porosity;The enhancement effect of the porous copper fiber sintered felt on the flow velocity in the Z-axis direction is higher than that in the X-axis direction;The internal pressure drop of the porous copper fiber sintered felt increases with increasing porosity and inlet flow rate.In this paper,through the construction of active design model of porous copper fiber sintered felt,the relationship between its internal morphological structure and its external performance.The advantage is that it can quickly select the optimal design,save research and development funding for new products,shorten the Research and development cycle.lt is important to promote the use of porous materials in related fields.