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Sintered AZS Brick | Zirconia-Alumina Brick for Industrial Kilns from China Suppliers and Factory
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
Q
What is sintered AZS brick and what are its main chemical components?
Sintered AZS brick (Alumina-Zirconia-Silica brick) is a high-performance refractory material produced through a high-temperature sintering process. Its main chemical components include ZrO₂ (≥30–33%), Al₂O₃ (approximately 48%), and SiO₂ (≤19–22%), along with trace amounts of Fe₂O₃ (≤0.3%). The combination of ZrO₂ and Al₂O₃ forms a stable eutectic structure that gives the brick its outstanding corrosion resistance and mechanical strength.
Q
What makes sintered AZS brick superior to ordinary refractory bricks in glass furnaces?
Sintered AZS brick offers exceptional resistance to glass melt corrosion, alkali vapor attack, and thermal shock — all critical challenges in glass furnace environments. Its dense crystal structure (apparent porosity ≤18%, bulk density ≥3.0 g/cm³) effectively blocks the penetration of molten glass and slag, reducing contamination of the glass melt, minimizing bubble and impurity generation, and significantly extending furnace service life compared to standard refractory bricks.
Q
In which industries and applications can sintered AZS bricks be used?
Sintered AZS bricks are widely used across multiple high-temperature industries: in the glass industry (float glass furnaces, pharmaceutical glass furnaces, glass fiber kilns, rock wool fiber kilns, and daily-use/special glass furnaces); in the metallurgical industry (steel ladle slag lines, converter linings, non-ferrous metal melting furnaces); and in the ceramic industry (ceramic frit kilns and high-end ceramic firing kilns). Their versatility makes them suitable for any environment involving high temperatures, corrosive media, and thermal cycling.
Q
What is the maximum service temperature of sintered AZS brick?
Sintered AZS brick has a Refractoriness Under Load T0.6 (at 0.2 MPa) of ≥1680°C for the standard ZrO₂ ≥30% grade and ≥1700°C for the higher ZrO₂ ≥33% grade. This makes it suitable for sustained operation in extreme high-temperature environments found in glass melting furnaces, metallurgical furnaces, and ceramic kilns.
Q
Can sintered AZS bricks be customized to meet specific project requirements?
Yes. While standard product parameters are provided as a reference, sintered zirconium corundum bricks can be fully customized in terms of dimensions, shapes, ZrO₂ content levels, and other performance indicators to meet customers' specific working condition requirements. Whether your application demands unique sizes, special chemical compositions, or enhanced mechanical properties, our team can develop tailored solutions to suit your furnace design and operational needs.
Q
How does the ZrO₂ content affect the performance of sintered AZS brick?
Higher ZrO₂ content generally results in improved overall performance. Comparing the two standard grades: the ZrO₂ ≥33% grade achieves a higher bulk density (≥3.2 g/cm³ vs. ≥3.0 g/cm³), lower apparent porosity (≤17% vs. ≤18%), and a higher refractoriness under load (≥1700°C vs. ≥1680°C). Additionally, ZrO₂ provides the phase-change toughening effect that enhances thermal shock resistance, making higher-ZrO₂ grades particularly suitable for applications with frequent temperature fluctuations and aggressive chemical corrosion.