Aluminum Non-Wetting Castable is a high-performance refractory material specially developed for the melting process of aluminum and aluminum alloys. By adding special anti-wetting components to traditional high-alumina castables, these materials effectively block the penetration of molten aluminum. In the aluminum processing industry, the average service life of aluminum melting furnace linings often depends on the aluminum erosion resistance of the castable. High-quality aluminum non-wetting castables can extend the service life of the lining by 3-5 times, while reducing molten aluminum contamination and improving product quality.
From the perspective of materials science, the realization of the non-wetting property mainly relies on three mechanisms: first, high-purity raw materials are selected to reduce reactivity, with the Al₂O₃ content in typical formulations generally exceeding 65%; second, ultrafine powder technology is used to improve material density, requiring a bulk density of more than 2.4 g/cm³; most critically, composite barium salts, chromium oxide and other non-wetting agents are added to form an energy barrier on the material surface. These technical elements together form the basic framework for the formulation of enterprise standards.
Advantage
Excellent high temperature performance
High bulk density
High bonding strength
Good resistance to molten aluminum penetration
Wear resistance
Mechanical shock resistance
Anti-molten aluminum adhesion: Special composite additives are added, making molten aluminum hard to adhere. It allows easy cleaning and prevents furnace cavity shrinkage caused by aluminum adhesion.
Penetration and corrosion resistance: Low porosity blocks molten aluminum infiltration and resists slag erosion, protecting furnace structure from damage.
Superior thermal insulation: Stabilizes molten aluminum temperature and reduces heat loss. No aluminum ash generates to avoid impurity contamination.
High strength and scour resistance: Made of high-alumina or corundum material with outstanding wear resistance, resistant to molten aluminum scouring and slag shedding.
Physical And Chemical Specifications
| Item | Parameter |
|---|---|
| Product Name | Aluminum Non-Wetting Castable |
| Al₂O₃ (%) | 75 |
| SiO₂ (%) | 16 |
| Refractoriness (℃) | 1790 |
| Bulk Density (g/cm³) | 2.6 |
| Flexural Strength (MPa) | 9 |
| Flexural Strength (MPa) | 12 |
| Compressive Strength (MPa) | 80 |
| Compressive Strength (MPa) | 110 |
| Linear Change after Firing (%) | -0.2 |
Application
Easy construction, suitable for various working methods.
Mainly applied to walls, bottoms, degassing boxes, launders, tapping spouts, front boxes and holding furnaces of aluminum melting furnaces. It prevents penetration and adhesion of molten aluminum and extends service life of equipment.
Melting furnace liningCommonly used on bottoms, walls and roofs of aluminum melting furnaces where direct contact with high-temperature molten aluminum occurs.
Transfer and casting toolsServes as lining for ladles, transfer ladles and launders used for conveying and guiding molten aluminum.
Electrolytic and reverberatory furnacesApplied to specific parts such as discharge outlets and burner nozzles of electrolytic cells and reverberatory furnaces.
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