Synergistic effects of tubular halloysite clay and zirconium phosphate on thermal behavior of intumescent coating for structural steel

Zirconium phosphate (ZrP) recently introduced in intumescent fire protective coating has shown improvement developing ceramic layer. The tubular halloysite clay (THC) due to its unique molecular structure can be combined with ZrP enhance resistance by a strong silica network on the char surface. This study is aimed investigate synergistic effects of and zirconium fillers improve thermal performance coating. control formulation range formulations using combination weight percentage THC were developed influences performance. expansion tests coatings conducted furnace test Lab scale jet. Thermal stability was determined TGA characterized FESEM, XRD, FTIR XPS. Water-resistance performed according ASTM D-870. Results showed that reinforcement THC-ZrP promising IFC substrate temperature far below critical temperature, 550 °C. Sample HZ 5 least backside steel 219 Expansion rate found reduced addition but improved compactness. 18% 5% residual wt. Of char. Char morphology network, XRD confirmed presence silicon. Water absorption 95% less water (HZ-5) compared Post immersion, 7% increase which than after immersion test.