FLASH sintering of porcelain stoneware: effect of composition modifications


n this work, we have exploited FLASH sintering as an alternative sintering process in the production of porcelain stoneware. FLASH sintering of porcelain stoneware occurred at temperatures ~1020 ºC, for 500 V.cm-1, 2 mA.mm-2 in 30 seconds. These conditions are significantly less severe than those typically applied in its conventional sintering, 1150–1250 ºC for 1 h. Despite the reduction of time and sintering temperature, FLASH sintered samples exhibit heterogeneous microstructure and elemental distribution, with localized glassy phase formed on the positive pole. By decreasing the feldspar content, less localized glassy phase and more uniform microstructures were obtained, being of relevance the highest density and microstructure uniformity attained in the composition without feldspar. These results extend the FLASH sintering applicability and illustrate its importance for the development of alternative sintering technologies in traditional ceramic industry, that in addition may benefit from the reduction of feldspar in the porcelain stoneware production.


Camila Ribeiro; Luis Figueiredo; Ricardo Serrazina; José C. Almeida; Joana Salgado; Regina Santos; Helio Jorge; Álvaro Serrão; Pedro Marcos; M. Elisabete Costa; Paula M. Vilarinho; Ana M. Senos

our authors


This work was developed within the scope of the project REVIDRY project, contract nr. POCI-01-0247-FEDER-017784, funded by COMPETE 2020, Portugal 2020 and the European Union through the European Regional Development Fund (ERDF), and within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement.

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