L’AZS electrofusion is an essential type of refractory ceramic (heat-resistant material) used in the most aggressive industrial environments, such as melting furnaces. The acronym AZS refers to its main chemical composition: Alumina (Al2O3), Zirconia (ZrO2), and Silica (SiO2).
In-depth definition : A refractory AZS electrofusion is a solid block produced by the’electrofusion which gives the material maximum density and a unique crystalline microstructure. The raw material (a mixture of oxides) is melted in a electric arc furnace at extreme temperatures (often in excess of 2500∘C). It is then cast into molds and slowly cooled to form large crystals and extremely cohesive structures. This process, originating from’Industrialisation guarantees exceptional resistance to chemical and thermal wear.
Key Properties Derived from Electro-Melting
The choice of AZS for critical applications is based on its exceptional physical and chemical properties, which surpass those of sintered or unfused ceramics:
- Excellent corrosion resistance : This is its most valuable property. AZS is virtually inert to molten glass baths and slags (metallurgical residues), including those with high alkali content.
- Very High Service Temperature : It maintains its structure and mechanical properties at temperatures above 1600∘C without deforming.
- Low Porosity and High Density: Electrofusion eliminates the majority of pores. This high density prevents the corrosive bath from penetrating the structure, which is the main cause of degradation in conventional refractories.
- Crystal structure : AZS is a composite of corundum (alumina) and baddeleyite (zirconia) grains, bonded by a glassy phase. The presence of crystallized zirconia is the key to its superior corrosion resistance.
Strategic Applications in Industrial Performance
AZS is used when furnace reliability and longevity are critical, as the cost of shutting down a furnace (and rebuilding it) is exorbitant. It is the key to Industrial Performance in :
- Glass industry (Main application) : AZS is used for the most highly stressed areas of the melting furnace, such as the float line, basin walls (where molten glass corrodes most), and burners. It ensures long furnace life and low maintenance. Quality constant quality of the glass produced (avoiding contamination by corrosion of the refractories).
- Metallurgy : For melting tanks and furnace linings processing non-ferrous metals.
- Chemical industry : For chemical reactors operating at very high temperatures and in the presence of corrosive products.
Investment in refractory stone in AZS electrofusion is a central element of the heavy industry's log-cost reduction strategy, ensuring the sustainability and maximum efficiency of the melting process.
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