Constitutive model and numerical simulation for injection molding of MgTiO_(3) ceramic parts  

MgTiO_(3)陶瓷零件注射成型本构模型及数值模拟

作　　者：GU Xing-jian LIU Kai HU Jia-ming DU Yan-ying SUN Hua-jun 顾星建;刘凯;胡佳明;杜艳迎;孙华君(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Logistics Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China [2]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China [3]School of Logistics Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Central South University》2021年第4期1244-1254,共11页中南大学学报（英文版）

基　　金：Project(2018CFB439)supported by the Hubei Province Natural Science Foundation,China。

摘　　要：In order to predict the powder flow law of the injection molding process of MgTiO3 ceramic parts with complex structures,a constitutive model and numerical simulation method for MgTiO3 ceramic injection molding were established based on the Hunt method.The material parameters of MgTiO3 such as elastic modulus,Poisson ratio,glass transition temperature,thermal conductivity and specific heat capacity were measured.Based on the fitting curve and the material parameters measured,the cross-WLF viscosity model and P-V-T model required for MgTiO3 ceramic injection molding were optimized.Furthermore,the influence of process parameters on mold filling flow and distribution of parts defects was researched.It was found that the gate position,injection speed and melt temperature have greater influence on mold filling flow and the packing process has an obvious effect on parts’defects.On this basis,the MgTiO3 ceramic parts injection molding experiment verification was carried out.By comparing the experimental results with the simulated results,it is found that the deformation error is within 1.5%and the density error is within 1%.Therefore,this research provided theoretical guidance for the engineering application of MgTiO3 ceramic parts fabricated by injection molding.为了预测结构复杂的MgTiO_(3)陶瓷零件注射成型过程中的粉末流动规律,本文基于Hunt方法建立了MgTiO_(3)陶瓷注射成型的本构模型和数值模拟方法。测量了MgTiO3的材料参数,如弹性模量、泊松比、玻璃化转变温度、导热系数和比热容。根据拟合曲线和测得的材料参数,优化了MgTiO_(3)陶瓷注射成型所需的Cross-WLF粘度模型和P-V-T模型。此外,研究了工艺参数对注射成型填充流动和零件缺陷分布的影响。结果发现,浇口位置、注射速度和熔体温度对注射成型填充流动的影响更大,而填充过程对零件的缺陷有明显的影响。在此基础上,进行了MgTiO_(3)陶瓷零件的注射成型实验验证。通过将实验结果与模拟结果进行比较,发现变形误差在1.5%以内,密度误差在1%以内。本研究为MgTiO_(3)陶瓷零件注射成型的的工程应用提供了理论指导。

关 键 词：MGTIO3 ceramic injection molding constitutive model process parameters 

分 类 号：TQ174.62[化学工程—陶瓷工业]