Research On Microstructure Evolution Of Ceramic Material Sintering Process Based On Phase Field Model

Ceramic materials have unparalleled advantages among traditional materials due to their corrosion resistance,high temperature resistance and wear resistance.The traditional research method is called the "trial and error method".This method not only has a long research and development cycle,but also has a high cost.Computer simulation of ceramic material sintering related theoretical research can shorten the research and development cycle and reduce costs,which has very important practical significance.Among them,phase-field simulation has gradually become one of the main contents of research by researchers in the field of ceramic materials.In this paper,the evolution of the microstructure of ceramic materials during the sintering process based on the phase field method model.The phase field method model is a theoretical model developed in recent years to study the microstructure of materials.It has been widely used in the study of grain growth,recrystallization and gas phase.However,research on the number of orientation fields related to grain growth,the influence of two-phase particles on grain growth under different conditions,and the influence of the time of their gas phase generation on the growth of twophase particles and single-phase particles have not been carried out yet.This is not commensurate with the rigor of scientific experiments and the phase-field method.Therefore,a phase field theoretical model including two-phase particles and gas phase structure was constructed to simulate the evolution process of the microstructure structure of grain growth.Not only can the volume fraction,geometric shape and other related parameters of the twophase particles be tested for the influence of the grain growth,but also the ceramic material can play a good predictive idea on the process microstructure design,process control and macroscopic physical properties.Over.Provide a solid foundation for the research and development of ceramic materials.A theoretical model of phase field for single-phase particle and grain growth is established,and the influence of simulation time and orientation field number on grain growth is analyzed.The experimental results show that as the simulation time increases,the grains grow into a parabolic law: when the number of orientation fields is small,the probability of abnormal grain growth increases.The phase field theory model of the two-phase particle and grain growth is constructed,and the growth law of the two-phase particle and grain growth under different conditions is analyzed.The simulation experiment results show that as the volume fraction of the twophase particles increases,the average area of the crystal grains decreases,and the average size distribution of the crystal grains becomes more and more uniform;the mutual engulfing of the two-phase particles and the single-phase particles causes a certain degree of grain growth.Influence,the two-phase particles and single-phase particles can swallow each other violently,resulting in an increase in the probability of abnormal growth of crystal grains,and the average distribution size of crystal grains is relatively uneven.Construct a phase field theoretical model for gas phase and two-phase particles.The experimental results show that the difference in gas phase content will cause less impact on grain growth,but when the gas phase content is large,the compactness of the ceramic material will decrease and the physical properties of the material will be affected;The gas phase structure appeared after the experiment was carried out for a period of time,and the average size of the grains was more uniform than that of the gas phase structure at the beginning,and the grain growth was better.