Design of alumina/β-eucryptite composite from alum sludge waste: physical properties, phase composition and coefficient of thermal expansion

Hegazy, Wael Hussein; Khattab, Riham Mostafa; Abo almaged, Hanan Hassan; Sebak, Mahmoud

doi:10.21608/fsrt.2023.193983.1085

	Design of alumina/β-eucryptite composite from alum sludge waste: physical properties, phase composition and coefficient of thermal expansion
Frontiers in Scientific Research and Technology
Volume 5, Issue 1, March 2023 PDF (1.56 MB)
Document Type: Original Article
DOI: 10.21608/fsrt.2023.193983.1085
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Authors
Wael Hussein Hegazy ¹; Riham Mostafa Khattab²; Hanan Hassan Abo almaged²; Mahmoud Sebak³
¹Suez University, Faculty of Science, Egypt
²Refractories, Ceramics and Building Materials Department, National Research Centre (NRC), Dokki 12622, Cairo, Egypt
³Petroleum Medical Centre, Suez, Egypt
Abstract
The main objective of this research is to design alumina/β-eucryptite composite with a low coefficient of thermal expansion (CTE) and then test its sinterability using alum sludge from water treatment plants as an alumina source. A suitable chemical method is used to extract alumina from alum sludge waste. In addition to extracted alumina, silica fume waste and lithium carbonate were used to prepare β-eucryptite. In order to prepare β-eucryptite, the phase formation is first to be adjusted. The prepared samples were fired at 800, 1000, and 1200 ºC, respectively.XRD, SEM, physical properties, and thermal expansion are used to characterize these samples. The results indicate that 1000ºC is the optimum temperature for eucryptite formation. The samples of alumina/β-eucryptite containing 10, 20, 30, and 40% eucryptite are then prepared, and the influence of the heat treatment on the prepared composites is studied at temperature ranges of 1300, 1400, and 1500ºC. XRD analysis, microstructure, physical, and mechanical properties of alumina/β-eucryptite composites are investigated. The coefficient of thermal expansion (CTE) for various alumina/β-eucryptite samples at 1500ºC reduces with increasing β-eucryptite content, reaching 0.8098 x 10-6 oC-1. The results demonstrate that a composite with good mechanical properties and a low thermal expansion coefficient can be formed and utilized in a variety of different applications.
Keywords
Waste materials; Alumina; β-eucryptite; thermal expansion coefficient; alum sludge waste


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