Design And Simulation Of Induction Hot Pressing Sintering System

Functional ceramic material is one kind of widely applied functional material,hence the rapid preparation of functional ceramic materials is important for development of this field.Hot pressing sintering is an important means for the preparation of functional ceramic materials.Heating rate improvement of hot pressing sintering can effectively speed up the production rate.Application of induction heating is becoming more and more extensive in the industrial production due to its fast heating rate,hot zone stability,energy conservation and environment protection.Induction heating technology was applied in the field of hot pressing sintering in this thesis.A high efficient hot pressing system sintering was designed and accomplished,which could adapt to the rapid hot pressing of multiple sample size and met the different working conditions of experimental and industrial production.With this system,the rate of hot pressing process was rapidly improved and the scope of the device was broadened.According to the technical requirements for hot pressing sintering system,the system design was accomplished,including the designation of the furnace structure,heating system,hydraulic system,cooling system and vacuum system.In order to provide guidance to the actual sintering experiments,while optimizing the system design of the hot pressing,a study of temperature field simulation was performed.On the basis of a large number of numerical simulations on induction heating,a simulation model of induction heating for graphite mold was given the first time.A simulation of the thermal-electromagnetic coupling field on hot pressing mold was made via the implementation of ANSYS software.Electromagnetic field and temperature field results were intensively studied and explained.At the same time,comparative analysis of different factors on the temperature field were made,such as current densities,electromagnetic frequencies,distances between mold and induction coil and atmosphere environments,etc.Finally,in order to verify the partial results of the simulation study,temperature distribution experiments,the influences of current intensity and the distance of the coil and the mold for the temperature field experiments are verified experimentally using the hot pressing sintering system.Simulation of the experiment was basically consistent with the actual law.The relevant explanations were also given for some discrepancies.