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China Suppliers Factory Sintered AZS Brick | High-Quality Zirconia Alumina Brick for 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 ≥3.0 g/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 ℃ (0.2 MPa) | ≥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 what are its main components?
Sintered AZS brick (Alumina-Zirconia-Silica refractory brick) is manufactured through a high-temperature sintering process. Its core components are ZrO₂ (zirconia) and Al₂O₃ (alumina), which form a stable eutectic structure. Standard grades contain ≥30–33% ZrO₂ and approximately 48% Al₂O₃, delivering outstanding corrosion resistance, low porosity, and excellent mechanical strength.
What is the maximum service temperature of sintered AZS brick?
Sintered AZS bricks exhibit a Refractoriness Under Load (T0.6 at 0.2 MPa) of ≥1680°C for the standard grade and ≥1700°C for the premium grade, making them suitable for continuous high-temperature environments found in glass furnaces, metallurgical kilns, and ceramic firing equipment.
Why is sintered AZS brick preferred over fused-cast AZS brick in certain applications?
Sintered AZS brick offers superior thermal shock resistance due to the phase-change toughening mechanism of ZrO₂, making it ideal for applications with frequent temperature cycling such as kiln start-stop operations. It also provides more cost-effective customization for complex shapes and special specifications compared to fused-cast alternatives.
Which industries and kiln types are sintered AZS bricks most commonly used in?
Sintered AZS bricks are widely used across three major industries: (1) Glass industry — float glass furnaces, pharmaceutical glass kilns, glass fiber kilns, and rock wool fiber kilns; (2) Metallurgical industry — steel ladles, converters, non-ferrous metal smelting furnaces, and regenerators; (3) Ceramic industry — frit glaze kilns and high-end ceramic firing kilns.
Can sintered AZS bricks be customized for special specifications or working conditions?
Yes. While standard parameters cover ZrO₂ ≥30% and ≥33% grades, sintered zirconium corundum bricks with special dimensions, shapes, and enhanced performance indicators can be fully customized to meet customers' specific working condition requirements. Please contact us with your technical specifications for a tailored solution.
How does the low apparent porosity of sintered AZS brick benefit furnace performance?
With apparent porosity ≤18% and bulk density ≥3.0 g/cm³, the dense microstructure of sintered AZS brick effectively blocks the infiltration of corrosive media such as molten glass, slag, and chemical vapors. This significantly reduces material degradation, minimizes contamination of the melt, extends the overall service life of the furnace lining, and lowers maintenance frequency and operating costs.