莫来石材料热压烧结过程的计算机模拟

Computer Simulation of Hot Pressing Sintering of Mullite Materials

本文通过对ZTM材料热压烧结过程实测及机理分析,指出该种材料的热压烧结机理为塑性流动机理。把塑性流动理论与传热理论相结合,建立了热压烧结过程的综合数学模型,并用 FORTRAN 语言编制了计算机源程序。通过模拟与实验结果的比较,证明该数学模型是比较符合实际的。模拟结果表明,热压温度、压力和保温时间是影响致密化的最重要因素,升、降温速率、初始密度、试样尺寸等对致密化和制品内部温度场也有影响。

On the basis of practical measurement and analysis of hot pressing sintering ofzlrconia toughened mullite materials,we can know the mechanism of the hot pres-sing sintering is plastic flow.According to plastic flow theory and heat transfertheory,a mathematical model for the hot pressing sintering has been established.The computer software has been programed by using FORTAN language.The simu-lation results are basically in agreement with the experimental data.By computersimulation,it can be shown that the hot pressing pressure,temperature and alsothe duration at firing temperature are most important factors.The temperature ris-ing rate and cooling rate,the initial density and the sample size all affect the de-nsification and the internal temperature field of the sample.