41# Non-Shrink Electrofused Zirconia-Alumina Brick
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Description:
Main Types of Electrofused Zirconia‑Alumina Refractory Bricks
Electrofused zirconia‑alumina brick ( AZS bricks are classified into three categories based on their ZrO₂ content:
- AZS-33# ： ZrO₂ content: 32–36%; Al₂O₃ as the remainder; SiO₂ ≤ 16%. Primarily used in non‑directly erosive areas such as the upper structure of glass furnaces and the walls of the working pool.
- AZS-36# ： With a ZrO₂ content of 35–40% and an even lower glass phase content, it is suitable for the hot spots in glass melting tanks.
- AZS-41# ： With a ZrO₂ content of 40–44%, it offers the best erosion resistance and is used in critical areas such as flow channels and kiln shoulders.
Production Process
Adopting the core process of oxidative melting:
- Ingredient melting Zircon sand ( (ZrO₂ ≥ 65%) is mixed with industrial alumina in proportion, melted at 2000°C in an arc furnace, and then oxygen is blown in to remove carbon (carbon content ≤ 0.02%).
- Casting molding : Four methods are employed: conventional casting ( PT), tilt casting (QX), shrinkage‑free casting (WS), and quasi-shrinkage‑free casting (ZWS) to control the location of shrinkage cavities.
- Annealing treatment ： An 800°C annealing furnace, with a stepwise cooling process from 700°C to 600°C to 450°C, takes 2 hours to cool down to 150°C.
- Machining Cutting the sprue area with an accuracy of ±0.5 mm.
Application Scenarios
- Glass Industry : Coverage 90% of applications are used for pool walls (No. 36), feed inlets (No. 41), and flow channels (WS type), with a service life of 5–8 years.
- Iron and Steel Metallurgy : Ladle slide plate, RH furnace immersion tube, resistant to molten steel erosion.
- Chemical Industry : Lining for coal gasification furnaces, resistant to acidic media.
- Electronic glass Key components of LCD glass melting furnaces, ensuring high-purity requirements.
Performance Advantages
- Superior corrosion resistance : The corrosion rate of sodium-calcium glass is ≤1.5 mm/24 h (1500℃).
- High-temperature stability : Load softening temperature ≥1700℃, with no shrinkage.
- Low pollution The bubble release rate produced by the oxidation method is ≤2% (at 1300℃).
- Dense structure Apparent porosity ≤ 2%, bulk density 3.7–3.9 g/cm³.
Physicochemical indicators (based on Take AZS-41# as an example)
Indicator
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Parameter Range
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Test standards
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ZrO₂ content
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40–44%
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GB/T 4984
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Glass phase exsolution temperature
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≥1400℃
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JC/T 494
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Thermal expansion coefficient (1000℃)
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0.7–0.9%
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GB/T 7320
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Resistant to glass melt corrosion
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≤1.3 mm/24 h
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JC/T 805
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Bulk Density (WS Type)
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3850 kg/m³
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Enterprise Standard
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Note: The WS product increases usable volume by 15% by eliminating the shrinkage cavity area.
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41# Non-Shrink Electrofused Zirconia-Alumina Brick
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