Electro-thermo-mechanical Finite Element Analysis on DC Pulse Resistance Pressure Sintering Process of Zirconia Part

Abstract

Some difficulties have arisen on appropriate design of the graphite dies, on applying the DC pulse resistance pressure sintering process, which is more efficient process than other conventional sintering processes such as hot pressing process, to a complex shaped part of non-conductive ceramics powder such as zirconia powder. In the present paper, the non-steady electro-thermomechanical finite element analysis of the sintering process of the zirconia cylindrical can was performed. As a result, it was found that the enough heating of the graphite dies that contacts with zirconia powder, and heat transmission from the die to zirconia powder was essential for the success of the sintering with adequate density. Moreover, the lower density region was found at the inside of the can during the process, which corresponded to the region where the convex shape formed in experiments. Furthermore, the high tensile residual circumferential stress was observed at the side wall from the simulation of the cooling process, which is caused by the different thermal expansion ratio of the graphite and zirconia materials. This stress was considered to be related with the fracture of the can longitudinally during cooling process in experiments.

Tooling in Spark Plasma Sintering Technology: Design, Optimization, and Application

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Physicochemical properties and cytocompatibility assessment of non-degradable scaffolds for bone tissue engineering applications

“…A structural mechanical module was set for the mechanical simulation and the structures were modelled as a linear elastic materials using the micro-CT and SEM morphological data. The models were defined with an elastic modulus, Poisson's ratio and density of 110 GPa, 0.34 and 4500 kg/m 3 for the Ti 6 Al 4 V, 200 GPa; 0.30 and 6000 kg/m 3 for the ZrO 2 ; 3.76 GPa, 0.38 and 1300 kg/m 3 for PEEK (Bartolomeu et al, 2019;Kubota et al, 2014;Garcia-Gonzalez et al, 2015). Finite element meshes were generated for each model using tetrahedral elements following the same strategy as reported in literature (Bartolomeu et al, 2019), assuring the convergence of the numerical simulation following a parametric study.…”