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Evaluation of Rheological and Thermal Behavior of Ceramic Materials during Liquid Phase Sintering with Numerical-Experimental Procedure
E. Salahi, H. Yaghoubi, F. Taati
Abstract
Its shear and bulk viscosity, as well as dynamic viscosity, describe the rheological behavior of a ceramic body during liquid-phase sintering. The thermal behavior of a ceramic body during sintering, including viscous flow deformation, anisotropic shrinkage, heterogeneous densification, has a significant influence on both the final body\'s dimensional precision and the densification process. In this paper, the numerical-experimental method was developed to study both the rheological and thermal behavior of hard porcelain ceramic body during the liquid phase sintering process. After analysis of the raw materials, a standard hard porcelain mixture was designed and prepared as a ceramic body. The finite element method in the CREEP user subroutine code in ABAQUS was implemented for the ceramic specimens during the liquid-phase sintering process. Densification results confirmed that the bulk viscosity was well-defined with relative density. Also, deflection and shrinkage outputs proved that the shear viscosity was well-defined with dynamic viscosity. The sintering stress exceeded the hydrostatic stress during the entire sintering time so the sintering process occured completely. Dilatometry, SEM, XRD investigations as well as simulation results for bulk viscosity confirmed the \"mullitization plateau\" as very limited expansion during the final sintering stage.
Keywords
Rheological behavior, hard porcelain, liquid phase sintering, numerical-experimental analysis
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