Characteristics of White Fused Alumina for Refractory Coatings
White fused alumina for refractory coatings features a high melting point, excellent thermal stability, strong chemical corrosion resistance, high hardness and wear resistance, good workability, and uniform, dense coatings. Key characteristics are detailed below:
I. High Melting Point and Thermal Stability
White fused alumina possesses a high melting point, maintaining stable physical and chemical properties under high temperatures without melting or deformation. This makes it an ideal material for enhancing the refractory performance of coatings, ensuring they withstand prolonged exposure to high temperatures in furnaces, smelting furnaces, and similar equipment without failure.
II. Chemical Corrosion Resistance
White fused alumina exhibits high resistance to corrosive substances like acids and alkalis, remaining unaffected by most chemicals. In corrosive environments within industries such as chemical processing and metallurgy, refractory coatings containing white fused alumina maintain long-term stability, effectively extending equipment lifespan.
III. High Hardness and Wear Resistance
With a Mohs hardness second only to diamond and silicon carbide, white fused alumina exhibits outstanding wear resistance. It withstands impact and abrasion from high-velocity fluids and particles while maintaining surface smoothness and flatness over time.
IV. Excellent Application Performance
White fused alumina can be applied via spraying, brushing, or similar methods. During application, it distributes uniformly and bonds tightly with the substrate to form a dense refractory layer. Its high purity and low impurity content reduce application complexity, enhance efficiency, ensure coating uniformity and density, and minimize cracking or peeling risks.
V. Uniform and Dense Coating
Refractory coatings containing white fused alumina form uniformly dense layers during application, effectively reducing porosity while increasing bulk density and strength. This contributes to enhanced overall coating performance, including refractoriness, impact resistance, and abrasion resistance.
VI. Oxidation Resistance and Thermal Shock Resistance
White fused alumina exhibits strong oxidation resistance and minimal chemical degradation during prolonged use, significantly reducing coating spalling and aging in oxidizing atmospheres. Additionally, it enhances thermal shock resistance and slag erosion resistance through composite formulations with various oxides or non-oxides.
VII. Multifunctionality and Broad Applicability
Refractory coatings containing white fused alumina are not only suitable for protecting high-temperature industrial equipment but can also be tailored to meet diverse requirements by adjusting particle size.
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