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High-alumina refractory castables bonded with metakaolin-based geopolymers prepared with different alkaline liquid reagents.
- Source :
-
Ceramics International . Jun2024:Part A, Vol. 50 Issue 11, p18628-18637. 10p. - Publication Year :
- 2024
-
Abstract
- This study explored the feasibility of utilizing varying proportions of metakaolin – MK (4, 6, or 8 wt%) and two types of alkaline liquid reagents – LR (incorporating nanosilica and NaOH or KOH) to induce in situ geopolymer formation in high-alumina refractory castables. The impact of geopolymeric binders on processing behavior, as well as on the physico-mechanical and structural properties of the designed refractories, was investigated within a temperature range of 40–1250 °C. Optimal physico-mechanical performance and thermal shock resistance were achieved with compositions 8 MK-Na (prepared with 8 wt% MK and NaOH-based LR) and 6 MK-K (containing 6 wt% MK and KOH-based LR). The liquid generation during viscous sintering enhanced castable densification at 1100–1250 °C and promoted the formation of nepheline, kalsilite or leucite phases. This resulted in microstructures featuring a suitable interfacial bond strength between the glassy phase and alumina grains, leading to an interlocking structure and improved castable properties. These achievements underscore the potential of geopolymer-bonded high-alumina castables for applications involving intermediate temperatures (800–1200 °C), such as those found in the petrochemical and non-ferrous metal industries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 50
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 176720394
- Full Text :
- https://doi.org/10.1016/j.ceramint.2024.02.351