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Fused Zirconia Mullite Brick – High-Performance Refractory for Glass Furnace & High-Temperature Industrial Lining
1. Product Overview
Fused Zirconia Mullite Brick is an advanced composite refractory manufactured with high-purity alumina and zircon raw materials via electric melting, high-pressure forming and high-temperature sintering. With mullite serving as the main crystalline matrix and uniformly distributed zirconia phases inside the structure, this material integrates the merits of mullite and zirconia. It fills the performance gap between common high alumina bricks and fused cast AZS blocks, becoming a cost-effective lining material widely used in glass melting furnaces, thermal furnaces and other metallurgical high-temperature equipment.
Different from ordinary sintered mullite bricks, the fused production process forms a tight and homogeneous crystal network inside the brick. The phase transformation toughening effect of zirconia effectively inhibits crack expansion when subjected to rapid temperature changes. Therefore, fused zirconia mullite brick delivers balanced performance in high-temperature strength, thermal shock resistance and resistance to glass liquid & alkali vapor erosion. It can operate stably under long-term continuous high-temperature working conditions without severe spalling or rapid erosion.
2. Core Physical & Chemical Advantages
2.1 Excellent High-Temperature Structural Stability
Fused zirconia mullite brick features high refractoriness and high refractoriness under load. It maintains stable mechanical strength at service temperatures up to 1700°C and shows low high-temperature creep rate under sustained thermal load. No obvious softening, deformation or permanent volume shrinkage occurs during long furnace operation, which stabilizes the overall geometry of furnace lining and avoids local hot spots caused by lining deformation.
2.2 Outstanding Thermal Shock Resistance
Zirconia dispersed in the mullite matrix absorbs thermal stress through phase transformation. The material can withstand frequent heating and cooling cycles without cracking or peeling. For glass furnaces undergoing periodic maintenance and temperature fluctuation, this property greatly extends the service cycle of the upper structure, suspended arches and breast wall lining.
2.3 Superior Resistance to Glass Liquid & Alkali Erosion
In glass production environments, alkali vapors and flowing molten glass are the primary causes of refractory damage. Fused zirconia mullite brick possesses reliable chemical inertness against silicate melt and alkaline gas. It slows down penetration and corrosion of molten glass into the brick interior, effectively reducing brick surface erosion, bubbling and stone defect formation in glass products.
2.4 Good Wear Resistance & Low Permeability
Dense fused microstructure leads to low apparent porosity and low gas permeability. It prevents corrosive gas from penetrating deep into the lining body. High cold crushing strength and hot abrasion resistance enable the brick to resist scouring from high-speed flue gas and flame impact, suitable for positions directly exposed to intense flame inside glass furnaces.
2.5 Balanced Cost Performance
Compared with fully fused cast AZS blocks, fused zirconia mullite brick cuts down procurement costs significantly while retaining decent anti-corrosion performance. It serves as an ideal economical alternative for non-severe erosion zones of glass furnaces, helping customers lower overall refractory investment without sacrificing furnace campaign life.
3. Main Application Fields
3.1 Glass Melting Furnace (Primary Application)
This brick is widely applied in the superstructure of soda-lime glass furnaces, including breast walls, suspended arches, port crowns, flue walls and regenerator partition walls. It works well for container glass, float glass and fiber glass production lines. Many furnace designers select fused zirconia mullite brick for medium-temperature areas where full AZS blocks are not mandatory.
3.2 Metallurgical & Heating Furnaces
In steel and non-ferrous metal industries, fused zirconia mullite brick can be adopted for heating furnace lining, soaking pit walls and other equipment working under medium-high temperature with certain alkali pollution. It can also be used as transition lining between working layer and thermal insulation layer.
3.3 Other High-Temperature Kilns
The product fits ceramic roller kilns, petrochemical reaction furnaces and waste heat recovery equipment. It can be matched with calcium silicate boards and fiber blankets to form a complete multi-layer thermal insulation lining system.
4. Available Grades & Customization Service
We supply multiple grades of fused zirconia mullite brick with adjustable ZrO₂ and Al₂O₃ content to match different temperature levels and corrosion severity. Standard straight bricks and special shaped bricks can be produced strictly according to customer drawings.
All raw materials undergo precise formulation control. During production, each batch is tested for bulk density, apparent porosity, cold crushing strength, refractoriness under load and chemical composition before delivery. Strict quality inspection ensures consistent performance for bulk shipments.
5. Installation & Matching Suggestions
Fused zirconia mullite brick can be installed with matched high-temperature refractory mortar. During lining construction, reasonable expansion joints should be reserved to adapt to thermal expansion under operating temperature. For integrated furnace lining design, we recommend combining fused zirconia mullite working layer with high-quality thermal insulation materials such as calcium silicate boards or ceramic fiber products to minimize surface heat loss and improve overall energy efficiency of kilns.
6. Cooperate With Us
If you are engaged in glass manufacturing, metallurgical engineering or furnace overhaul projects and are seeking stable, cost-effective anti-corrosion refractory bricks, welcome to send us your working conditions, target chemical indexes and dimensional requirements.
We are ready to provide complete technical data sheets, lab test reports, competitive factory quotations and sample support. Our technical team can also offer professional refractory lining scheme consultation for all kinds of industrial high-temperature kilns.
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