Constitutive model and numerical simulation for injection molding of MgTiO3 ceramic parts

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.