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

Le Manh Cuong; Ta Lam Cuong

doi:10.62239/jca.2025.021

Authors

Le Manh Cuong Faculty of Building Material, National University of Civil Engineering, Hanoi 100000, Vietnam
Ta Lam Cuong Hanoi University of Civil Engineering, 55 Giai Phong Street, Dong Tam Ward, Hai Ba Trung District, Hanoi, 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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