Research and development of heat-resistant coating based on polyaluminium phosphate (PAP) synthesized from aluminum slag

Le Manh Cuong

doi:10.62239/jca.2025.021

Authors

Le Manh Cuong Faculty of Building Material, National University of Civil Engineering, Hanoi 100000, Vietnam

DOI:

https://doi.org/10.62239/jca.2025.021

Keywords:

Heat-resitant coating, Phosphate binder, Polyaluminium phosphate, Aluminium Slag, Inorganic polymer

Abstract

This study presents the development of a heat-resistant coating based on polyaluminium phosphate (PAP) synthesized from aluminum slag and phosphoric acid. The coating formulation included inorganic fillers such as SiO₂, TiO₂, talc, and Samot powder. The resulting coating exhibited strong adhesion (rated 5B per ASTM D3359), maintained structural integrity after exposure to temperatures up to 750 °C, and showed a total mass loss below 10% in thermogravimetric analysis (TGA). Structural and morphological analyses (SEM, XRD, EDX) confirmed the formation of stable crystalline phases including AlPO₄ and SiO₂. These findings support the potential application of aluminum slag-derived PAP coatings in high-temperature environments, contributing to sustainable and cost-effective material development.

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