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China Suppliers Factory for Sintered AZS Brick / Zircon Alumina Brick for High-Temperature Industrial Kilns
Core Advantages
Dense Structure, Low Porosity & Impermeability
High-temperature sintering process creates a dense crystal structure with apparent porosity ≤18% and bulk density ≥3.0g/cm³, which can effectively block the penetration of corrosive media such as slag and glass melt, reduce material loss and extend service life.
Superior Corrosion Resistance
The core components ZrO₂ and Al₂O₃ form a stable eutectic structure, which has strong resistance to molten glass, molten steel, acid-alkali media, etc., especially suitable for glass furnaces against glass melt erosion and metallurgical furnaces against slag scouring scenarios.
Excellent Thermal Shock Resistance
Relying on the phase change toughening characteristics of ZrO₂, it can effectively absorb thermal stress generated by drastic temperature changes, prevent crack propagation, and is not easy to crack and peel under frequent heating and cooling conditions, suitable for kiln start-stop and temperature fluctuation scenarios.
Product Parameters
| Item | Sinter AZS Brick | |
|---|---|---|
| ZrO₂ % | ≥30 | ≥33 |
| Al₂O₃ % | 48 | 48 |
| SiO₂ % | ≤22 | ≤19 |
| Fe₂O₃ % | ≤0.3 | ≤0.3 |
| Bulk Density (g/cm³) | ≥3.0 | ≥3.2 |
| Apparent Porosity (%) | ≤18 | ≤17 |
| Cold Crushing Strength (MPa) | ≥100 | ≥100 |
| Refractoriness Under Load T0.6 (℃, 0.2MPa) | ≥1680 | ≥1700 |
Note: The above are standard parameters. Sintered zirconium corundum brick products with special specifications and performance indicators can be customized according to customers' specific working condition requirements.
Detailed Application Scenarios
1 Glass Industry (Core Application Field)
As a core special refractory material for glass furnaces, sintered zirconium corundum brick (AZS refractory brick) relies on excellent glass melt corrosion resistance, alkali vapor corrosion resistance and super thermal shock resistance, and is widely used in key load-bearing and contact parts of various glass production kilns. It can effectively ensure the continuity and stability of glass production, significantly improve the purity and surface quality of glass products, and reduce kiln maintenance frequency.
◎ Float Glass Furnaces: Key parts such as middle-layer bricks, arch foot bricks, channel sidewalls and bottom bricks of melting pools. Sintered zirconium corundum brick can effectively resist long-term scouring and chemical corrosion of molten glass melt, reduce the generation of bubbles and impurities in glass melt, ensure the flatness, light transmittance and dimensional accuracy of float glass, and extend the overall service life of float glass furnaces.
◎ Pharmaceutical Glass Furnaces: Special sintered zirconium corundum bricks for linings of melting zones and clarification zones of kilns. They accurately meet the strict requirements of pharmaceutical glass for raw material purity and stability, can effectively avoid refractory impurities from penetrating into glass melt, and ensure the safety and compliance of pharmaceutical glass from the source.
◎ Glass Fiber Kilns & Rock Wool Fiber Kilns: Sintered zirconium corundum bricks are used in high-temperature and high-scouring parts such as melting pools and flow holes. They can withstand continuous impact and corrosion of high-temperature molten materials, greatly extend the service life of kilns, reduce equipment shutdown and maintenance costs, and improve fiber production efficiency.
◎ Daily-Use Glass / Special Glass Furnaces: Customized sintered zirconium corundum bricks for core parts such as melting pools and feed channels. They can adapt to high-temperature and strong corrosion working conditions of different composition glass melting, and meet the efficient production needs of various products such as daily-use glass and special functional glass.
2 Metallurgical Industry
In the process of iron and steel, non-ferrous metal smelting, sintered zirconium corundum brick can withstand the dual corrosion of high temperature, molten metal liquid and slag, has high mechanical strength and structural stability, provides reliable lining protection for metallurgical kilns, extends the service life of furnace bodies, and reduces the risk of production interruption.
◎ Iron and Steel Smelting: Slag lines of ladles, linings of converters, sliding nozzles and lining bricks around submerged nozzles. They can effectively resist scouring and chemical corrosion of molten steel and slag, reduce furnace body loss, and ensure the continuous progress of smelting process.
◎ Non-Ferrous Metal Smelting: Linings of aluminum, copper and other metal melting furnaces and lining bricks of casting systems. They adapt to the high melting temperature and strong corrosion working conditions of non-ferrous metals, and avoid production accidents caused by lining damage.
◎ Metallurgical Auxiliary Equipment: Partition bricks of regenerators, linings of hot blast stoves and other parts. They can withstand scouring and temperature fluctuation of high-temperature flue gas, and improve the thermal efficiency and stability of equipment.
3 Ceramic Industry
In the ceramic production process, sintered zirconium corundum brick is suitable for key parts of high-temperature equipment such as ceramic frit glaze kilns and high-end ceramic firing kilns. It can withstand frequent heating and cooling cycles, maintain structural stability, and help improve the firing quality and output of ceramic products.
◎ Ceramic Frit Kilns: Linings of melting pools and lining bricks of discharge ports. They can resist corrosion and scouring of molten glaze, ensure the purity and uniformity of frits, and improve the quality of ceramic glaze surfaces.
◎ High-End Ceramic Firing Kilns: Kiln inner walls and kiln furniture lining bricks. They have excellent thermal shock resistance, are not easy to crack under frequent kiln start-stop conditions, reduce kiln furniture loss, and ensure the consistency of ceramic product firing.
Conclusion
Contact us now for a quote and experience the difference of working with the best in the business.
Frequently Asked Questions
What is sintered AZS brick and how is it different from fused AZS brick?
Sintered AZS brick is manufactured through a high-temperature sintering process that bonds Al₂O₃, ZrO₂ and SiO₂ into a dense polycrystalline structure. Unlike fused cast AZS brick — which is produced by melting raw materials and casting them into molds — sintered AZS brick offers lower apparent porosity, better dimensional consistency, and superior thermal shock resistance, making it particularly suitable for applications with frequent temperature fluctuations such as kiln start-stop cycles.
What ZrO₂ content grades are available, and how do I choose the right one?
Standard sintered AZS bricks are available in ≥30% and ≥33% ZrO₂ grades. Higher ZrO₂ content provides stronger corrosion resistance and a higher refractoriness under load (≥1700 °C for the ≥33% grade vs. ≥1680 °C for the ≥30% grade), along with lower apparent porosity and greater bulk density. Choose the ≥33% grade for the most aggressive corrosion environments such as glass melt contact zones, and the ≥30% grade for applications with moderate thermal and chemical demands. Custom grades are also available upon request.
Which industries and kiln positions are sintered AZS bricks most commonly used in?
Sintered AZS bricks are most widely used in the glass industry — including float glass furnaces, pharmaceutical glass furnaces, glass fiber kilns and rock wool fiber kilns — where direct contact with aggressive glass melts demands the highest corrosion resistance. They are also widely adopted in metallurgical applications (ladle slag lines, converter linings, non-ferrous metal melting furnaces) and in the ceramic industry (frit kilns, high-end ceramic firing kilns). Key positions include melting pool sidewalls, bottom bricks, arch foot bricks, feed channel linings and discharge port linings.
Can sintered AZS bricks be customized to specific shapes and performance requirements?
Yes. While the standard product parameters listed above cover the most common applications, sintered zirconium corundum bricks can be fully customized in terms of dimensions, shape, ZrO₂ content, bulk density targets, and other performance indicators. This is particularly valuable for complex kiln geometries or specialized working conditions. Please contact us with your specific requirements and our technical team will provide an optimized solution and quotation.
How does the phase change toughening of ZrO₂ improve thermal shock resistance?
Zirconia (ZrO₂) undergoes a reversible martensitic phase transformation between its monoclinic and tetragonal crystal phases when subjected to temperature changes. This transformation is accompanied by a slight volume change that generates compressive stresses at crack tips, effectively arresting crack propagation. As a result, sintered AZS bricks can absorb significant thermal stress during rapid heating or cooling without spalling or cracking — a critical advantage in kilns that experience frequent start-stop cycles or sudden temperature fluctuations.
What is the typical service life of sintered AZS bricks in a glass furnace, and what factors affect it?
The service life of sintered AZS bricks in a glass furnace depends on several factors, including the glass composition (borosilicate, soda-lime, pharmaceutical, etc.), furnace operating temperature, pull rate, and the specific position within the furnace. In well-designed float glass furnaces operating under normal conditions, high-quality sintered AZS bricks used in melting pool sidewalls and bottom areas can achieve service lives aligned with full furnace campaign durations. Choosing the correct ZrO₂ grade, ensuring proper installation, and maintaining stable operating temperatures are the most important factors in maximizing brick longevity.