Regensburg 2022 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session 2
MM 18.23: Poster
Tuesday, September 6, 2022, 17:30–20:00, P2
Optimization of flash sintering input parameters for obtaining 8YSZ dense samples — •Fábulo R. Monteiro1, Gustavo C. Dacanal1, João V. Campos2, Lilian M. Jesus2, Adilson L. Chinelatto3, and Eliria M. J. A. Pallone1 — 1University of São Paulo, Pirassununga, Brazil — 2Federal University of São Carlos, São Carlos, Brazil — 3University of Ponta Grossa, Ponta Grossa, Brazil
Flash sintering has been widely investigated due to its technological potential, since it allows very rapid densification of different ceramic materials. The literature still lacks studies assessing how the electrical parameters of the technique (electric field and current density) involved in the process affect material densification since these parameters may vary depending on furnace type and, especially, sample geometry. Thus, this study used the response surface technique to analyze and relate, in a multivariate way, a few flash sintering variables. A mathematical model was proposed to optimize the densification of 8YSZ cylindrical and dog-bone samples. For this, a complete second order factorial planning with three central points was used in combination with the response surface methodology. The results obtained allowed us to predict electric field and electric current density values to optimize the densification of 8YSZ samples in the two geometries used and to understand how electric field and electrical current density values affected onset and sample temperatures (estimated by the black body radiation model).