Developing a hollow glass microsphere/geopolymer thermal insulation composite for hot metal surface coating. Issue 9 (1st May 2022)

• Record Type: Journal Article
• Authors: Tatlisu, G. Can; Aciksari, Cem; Celebi, Serdar; Turan, Servet
• Is Part Of: Ceramics international. Volume 48:Issue 9(2022)
• Page Start: 11924
• Page End: 11939
• Publication Date: 2022-05-01
• Subjects: Geopolymer -- Hollow glass microsphere (HGM) -- Industrial waste -- Thermal insulation -- Hot metal surface; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.01.042
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Manufacturing inorganic thermal insulation materials with superior properties such as low thermal conductivity (k < 0.1 W/mK) and high mechanical properties in terms of adhesion strength is critical for energy efficiency in energy-intense industries. Geopolymer-based composites composing of hollow glass microspheres (HGMs), waste fly ash (FA), and metakaolin (MK) were successfully applied on hot (T∼300 °C) metal surfaces via spray deposition technique. The effect of Si/Al and Na/Al mole ratios and HGM loading on geopolymer composites' physical, microstructural, thermal, and adhesion strength properties were explored. The best composite composition was obtained when Si/Al mole ratio, Na/Al mole ratio, and HGM loading were 2.5, 1.0, and 10 wt %, respectively. This composition achieved an HGM/geopolymer composite material with low thermal conductivity (k ∼ 0.05 W/mK), high adhesion strength (∼5.0 MPa), and high stability under immersion in water and vibration environments (particularly exposed to water). The results showed that HGM/geopolymer composites could be used as a thermal insulation material in energy-intense industries.