Preparation of anorthite ceramics using SPS

0544098 - ÚFP 2022 RIV GB eng J - Journal Article
Csáki, Štefan - Lukáč, František - Húlan, T. - Veverka, Jakub - Knapek, Michal
Preparation of anorthite ceramics using SPS.
Journal of the European Ceramic Society. Roč. 41, č. 8 (2021), s. 4618-4624. ISSN 0955-2219. E-ISSN 1873-619X
Institutional support: RVO:61389021 ; RVO:61389005
Keywords : Anorthite * Crystallization * Kaolinite * Sintering
OECD category: Materials engineering
Impact factor: 6.364, year: 2021
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0955221921001473?via%3Dihub

A mixture of kaolin (92 wt.% of kaolinite) and laboratory-grade CaCO3 was used for anorthite preparation using the spark plasma sintering (SPS) technique. The powder was heated up to the maximum temperature (850 °C–1100 °C with a step of 50 °C, heating rate 50 °C/min) using the SPS device. The as-prepared samples were compared with a reference sample produced by dry pressing and conventional firing. Rietveld refinement performed on the X-ray diffraction data revealed that before anorthite formation, gehlenite and Ca-feldspar appeared, which gradually transformed into anorthite with increasing temperature. The sample prepared by SPS at 1100 °C contained 90 wt.% of anorthite, while the anorthite content in the reference sample reached only 47 wt.%. The porosity of the samples prepared by SPS reached significantly lower values compared to that of the reference sample. Therefore, SPS can be considered as a promising technique in the preparation of anorthite ceramics at lower temperatures.
Permanent Link: http://hdl.handle.net/11104/0321156