introduction
Magnesia-zirconia bricks are high-performance refractory materials composed of high-purity electrofused magnesia and synthetic zirconia sand. After high-pressure molding and high-temperature firing, these bricks exhibit excellent corrosion resistance to alkali metals, oxides, and sulfides. They possess a bulk density exceeding 3.08 g/cm³ and are resistant to alkaline corrosive atmospheres and alkaline slag corrosion. Consequently, they are widely used in glass melting furnaces, heat storage chambers, cement kilns, steelmaking furnaces, and non-ferrous metal smelting.
Advantage
Refractoriness: Withstands temperatures up to 1750°C (3182°F).
Thermal Shock Resistance: Survives rapid temperature changes (e.g., quenching from 1600°C to ambient).
Low Thermal Expansion: Minimizes stress cracks during thermal cycling.
Anti-Slag & Corrosion Resistance: Zirconia enhances protection against acidic/alkaline slag and molten metal penetration.
Long Service Life: Offers 2–3 times longer lifespan than standard magnesia-carbon bricks, reducing maintenance frequency and replacement costs.
Ideal for Critical Equipment: Suitable for applications where downtime is costly.
Zinfon Refractory Technology Co.,Ltd.
We provide one-stop services from technical consultation to design, production, and after-sales support.
Raw Materials:
Magnesium Oxide (MgO): ≥98% purity, ensuring thermal stability and resistance to basic slag.
Zirconium Dioxide (ZrO₂): ≥95% purity, stabilized with CaO or Y₂O₃, enhancing slag resistance and thermal shock resistance.
Physical and Chemical Specifications
|
Item |
Specification |
||
|
YXMZ8 |
YXMZ10 |
YXMZ13 |
|
|
MgO % |
≥80 |
≥75 |
≥70 |
|
ZrO2 % |
≥8 |
≥10 |
≥13 |
|
Apparent Porosity, % |
≤19 |
≤18 |
≤18 |
|
Bulk Density,g/cm3 |
≥2.95 |
≥3.0 |
≥3.05 |
|
CCS, MPa |
≥50 |
≥45 |
≥40 |
|
0.2MPa RUL ℃ |
≥1600 |
≥1550 |
≥1600 |
|
TSR, Cycle 950℃ Air |
≥10 |
≥10 |
≥10 |
process
Raw Material Preparation:
Mix powders with organic binders (e.g., phenolic resin) or phosphate binders to achieve green strength.
Granulate to ensure homogeneity and reduce voids.
Forming Process:
Isostatic Pressing: Applies uniform pressure for dense, crack-free bricks.
Vibration Compaction: For complex shapes or large dimensions.
Drying & Firing:
Drying: Gradual drying at 110–150°C for 24–48 hours to prevent internal stress cracks.
Firing: Sintering at 1550–1650°C in electric arc furnaces or gas-fired kilns.
Controlled Atmosphere: Reduce oxygen exposure to prevent zirconia phase transformations (e.g., monoclinic to tetragonal).
Quality Control:
Density Testing: Target bulk density ≥2.9 g/cm³ for minimal porosity.
Thermal Shock Testing: Quenching tests (e.g., from 1600°C to 20°C water) to verify resistance to cracking.
Slag Penetration Resistance: Simulate molten slag exposure to measure erosion rates.
Advanced Craftsmanship Techniques:
Zirconia Stabilization: Add 3–5% Y₂O₃ to stabilize cubic zirconia, preventing microcracks.
In-Situ Reaction Bonding: Combine MgO and ZrO₂ powders with a small amount of MgCl₂ to form strong Mg-Zr-O bonds during firing.
Precision Machining: CNC grinding for tight tolerances in critical applications (e.g., tundish nozzles).
|
Parameter |
Value |
|
Bulk Density |
≥2.9 g/cm³ |
|
Cold Crushing Strength |
≥50 MPa |
|
Thermal Conductivity |
1.5–2.0 W/(m·K) at 20°C |
|
Modulus of Rupture |
≥6 MPa (at 1200°C) |
Applications
|
Industry |
Use |
Benefits |
|
Steelmaking |
LF/VD/VOD ladles, tundish lining |
Slows erosion by molten steel and slag |
|
Non-Ferrous |
Aluminum reduction cells, copper converters |
Withstands molten metal splash corrosion |
|
Cement/Kilns |
Rotary kiln transitions zones |
Combats alkaline dust and thermal cycling |
types
I. Classification by composition
| Parameters | Pure magnesium-zirconium bricks | Stabilized magnesium-zirconium bricks | Composite magnesium-zirconium bricks |
| Bulk density (g/cm³) |
2.9-3.1 |
2.8-3.0 |
3.0-3.2 |
| Compressive strength (MPa) |
≥50 |
≥45 |
≥55 |
| Thermal shock stability (times) | 3-5 (1100°C water cooling) | 5-7 (1100°C water cooling) | 4-6 (1100°C water cooling) |
| Applicable temperature (℃) |
1600-1750 |
1500-1700 |
1400-1650 |
II. Classification by binding agent
Phosphate-Bonded Magnesium-Zirconia Bricks:
Binding Agent: Aluminum phosphate or magnesium phosphate.
Features: High strength in cold state, convenient construction. Stable performance at medium temperatures (300–1200°C).
Applications: Temporary repair of steel ladles, small and medium-sized kiln linings.
Resin-Bonded Magnesium-Zirconia Bricks:
Binding Agent: Phenolic resin or furan resin.
Features: Carbonization at high temperature to form a carbon bonding layer, excellent permeability resistance. Suitable for complex shape products (e.g., nozzles, slag walls).
Applications: Ladle spouts, refiner slag lines.
Metal-Bonded Magnesium-Zirconia Bricks:
Binding Agent: Cr₂O₃, SiC, and other metal oxides.
Features: Excellent resistance to oxidation and thermal shock.
Applications: Coke oven doors, blast furnace air vent areas.
III. Classification by application scenario
Magnesium-Zirconia Bricks for Steel Ladles:
Models: MZL-1 (high slag resistance type), MZL-2 (high wear resistance type).
Features: Surface sprayed with antioxidant coating to reduce steel penetration. Reserve 3–5mm expansion joint during masonry.
Cement Kiln Transition Zone Magnesium-Zirconia Bricks:
Model: MZ-KC (alkali erosion resistant type).
Features: Resistant to clinker alkaline dust (Na₂O, K₂O) erosion. Thermal shock stability ≥5 times (1100°C→normal temperature).
Magnesia-Zirconia Bricks for Glass Kiln Heat Storage Chambers
Model: MZ-G (High-Density and Low-Permeability Type)
Features:Porosity <18%, reducing the risk of glass liquid leakage.Resistant to acidic dust (e.g., mannite dust).
Recommendations for selection
Ladle lining: Prefer resin-bonded (for impermeability) or metal-bonded (for scour resistance) magnesia-zirconia bricks.
Cement kiln transition zone: Use stabilized magnesia-zirconia bricks (for alkali erosion resistance) or composite magnesia-zirconia bricks (for abrasion resistance).
Glass kiln heat storage chamber: Choose high-density, low-porosity pure magnesia-zirconia bricks (for anti-leakage performance).
Why chooes us?
Our research on the ZrO2 content in magnesia zirconia bricks shows that increasing the amount of zircon enhances properties like bulk density, compressive strength, load-softening temperature, and thermal shock resistance up to a certain point, after which these properties begin to decrease. The apparent porosity initially decreases and then increases. The optimal performance is achieved with a zircon content of 20% and a firing temperature of 1580°C. Magnesium-zirconium bricks with 20% zircon exhibit high load-softening temperatures and excellent erosion and thermal shock resistance, making them highly suitable for use in the grid bricks of glass furnace regenerators.
01/Customized dimensions and shapes
Customized shapes according to customer requirements
02/Delivery cycle and logistics
Sea freight, land freight,and so on.About 30 days, customized products delivery time depends on the actual situation.
03/Customized packaging
Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials.
04/Purchase Bricks at Reasonable Prices
Factory price
Low raw material cost
Mass production
By choosing ZINFON as your supplier, you can access high-quality refractory bricks, a wide range of other refractory materials, and comprehensive support. Contact ZINFON Refractories immediately to discuss your specific requirements and obtain customized solutions!
7*24 hours online response
Provide professional after-sales protection
Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
+8613700131695
+8618540210631
info@zinfon-refractory.com
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