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- Title
Geopolymer-Based Nepheline Ceramics: Effect of Sintering Profile on Morphological Characteristics and Flexural Strength.
- Authors
Ahmad, Romisuhani; Ibrahim, Wan Mastura Wan; Abdullah, Mohd Mustafa Al Bakri; Pakawanit, Phakkhananan; Vizureanu, Petrica; Abdullah, Arman Shah; Sandu, Andrei Victor; Ahmad Zaidi, Fakhryna Hannanee
- Abstract
The focus of this study is the fabrication of innovative and sustainable ceramic-based geopolymer with improved low temperatures performances. Kaolin was mixed with liquid sodium silicate (Na2SiO3) and 12M of sodium hydroxide (NaOH) solution using alkali activator ratio of 0.24 and solid-to-liquid ratio of 1:1 to synthesize kaolin geopolymer. The effect of the sintering profile on the microstructure, pore evolution and flexural strength were investigated. The heating exposure aided consolidation and created a fairly uniform microstructure, resulting in a smooth surface texture. In comparison to the unheated geopolymer, 3D pore distribution showed a significant increase in the range size of ~30 µm with the appearance of isolated and intergranular pores. The flexural strength at 1200 °C with a heating rate of 5 °C/min and was increased by 146.4% to 85.4 MPa, as compared to the heating rate of 2 °C/min. The sintering process has an impact on the final microstructure formation thus improving the characteristic of geopolymer-based nepheline ceramic.
- Subjects
FLEXURAL strength; LIQUID sodium; SINTERING; SURFACE texture; SOLUBLE glass; CERAMICS
- Publication
Crystals (2073-4352), 2022, Vol 12, Issue 9, pN.PAG
- ISSN
2073-4352
- Publication type
Article
- DOI
10.3390/cryst12091313