A versatile approach for the preparation of ceramics with porosity gradient: by using manganese and tin oxides as a model

A versatile approach for the preparation of ceramics with porosity gradient: by using manganese and tin oxides as a model

Abstract: Porous ceramics that exhibit porosity gradient are considered promising materials from the industrial point of view, especially for the production of ceramic membranesand filters. This paper describes a simple and versatile approach to produce ceramics with porosity gradient. In order to perform this study, MnO₂/SnO₂ bi-layered pellets were conformed via uniaxial pressure and sintered at 1100 °C and 1300 °C for different times. MnO₂ layer had the role of sintering aid, while the SnO₂layer was chosen as ceramic matrix subjected to the densification. The field emission scanning electron microscope (FE-SEM) was employed to obtain information on the microstructural features of these pellets. FE-SEM micrographs revealed that the overall percentage of porosity, pore size and shape in SnO₂ layer can be controlled by sintering variables (temperature and time). The results indicated a correlation between the porosity gradient in SnO₂ with the Mn concentration gradient in this matrix.

Authors:  Júlio César Sczancoski & Edson Roberto Leite

Journal of the European Ceramic Society

Volume 38, Issue 4, April 2018, Pages 2027-2034

DOI: https://doi.org/10.1016/j.jeurceramsoc.2017.10.028

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