Magnesia zirconia bricks provide an eco-friendly, high-performance alternative with 2-3x longer service life in critical zones like ladle slag lines, AOD converters, and cement rotary kiln transition zones. Their low thermal conductivity combined with excellent volume stability makes them ideal for energy-intensive processes where thermal efficiency and lining longevity are paramount.
These bricks are characterized by their high content of magnesium oxide (MgO) and zirconium oxide (ZrO₂), typically ranging from 70% to 90% MgO and 8% to 12% ZrO₂. The bricks have a bulk density greater than 3.05 g/cm³ and a cold crushing strength of over 50 MPa. They also exhibit excellent thermal stability, with a refractoriness under load of up to 1650°C. The uniform phase structure of these bricks ensures that the periclase and calcium zirconate are directly combined, making the space between the crystal grains resistant to erosion by liquid phases or slag.
Product Parameters
| Parameter | Unit | Value |
| Chemical Composition | ||
| Magnesium Oxide (MgO) | % | ≥70 - 97 |
| Zirconium Oxide (ZrO₂) | % | ≥6.5 - 13 |
| Silicon Dioxide (SiO₂) | % | ≤1.5 - 9.5 |
| Calcium Oxide (CaO) | % | ≤1.5 - 6.0 |
| Physical Properties | ||
| Apparent Porosity (A.P) | % | ≤16 - 18 |
| Bulk Density | g/cm³ | >3.05 |
| Cold Crushing Strength | MPa | >50 |
| Refractoriness Under Load (RUL) | °C | ≥1650 |
| Packaging Type | Wooden crates or pallets | |
| Applications | Glass kilns, cement kilns, steelmaking electric furnaces, non-ferrous metal smelting furnaces | |
Product Usage:
Magnesia zirconia bricks are widely used in industries that require materials to withstand high temperatures and corrosive environments. They are commonly used in the regenerators of glass kilns, where their thermal shock resistance and high-temperature performance make them an ideal choice. Additionally, these bricks are used in cement kilns, steelmaking electric furnaces, and non-ferrous metal smelting furnaces. Their ability to resist alkali metals, oxides, and sulfides makes them suitable for applications in the glass industry, where they can significantly improve the efficiency and longevity of kiln components.
Product Advantages
Superior Slag Resistance
Demonstrates 5-8x better corrosion resistance against basic slags compared to standard magnesia bricks, The zirconia component forms a protective barrier against lime-rich slags.
Thermal Shock Stability
Withstands 50+ rapid cooling cycles without spalling thanks to zirconia's unique transformation toughening mechanism
High-Temperature Strength
Maintains cold crushing strength >50 MPa even after prolonged exposure to operating temperatures up to 1750°C (3182°F), preventing structural collapse in aggressive environments.
Environmental Compliance
Completely chrome-free, addressing growing regulatory restrictions on hexavalent chromium while delivering comparable or superior performance to magnesia-chrome bricks.
Thermal Efficiency
Lower thermal conductivity than conventional basic bricks (1.8-2.2 W/m·K at 1000°C), reducing heat loss through vessel walls and improving energy efficiency.
Oxidation Resistance
These bricks perform reliably in oxidizing atmospheres without degradation.
Product technology:
The production of premium magnesia zirconia bricks follows a meticulously controlled process that ensures optimal phase distribution and microstructure development. We begin with high-purity raw materials – 97-98% fused magnesia (with controlled CaO/SiO₂ ratios) and 94-96% stabilized zirconia (typically CaO or Y₂O₃ stabilized to prevent phase transformations during cooling). These materials are wet-milled to precise particle size distributions before blending with temporary organic binders.
Key steps include:
Precision Mixing: Computer-controlled batch mixing ensures homogeneous distribution of zirconia within the magnesia matrix.
High-Pressure Forming: Hydraulic pressing at 150-200 MPa achieves uniform density (>3.0 g/cm³) with minimal porosity.
Drying: Controlled humidity drying cycles prevent cracking in green products.
High-Temperature Firing: Tunnel kiln firing at 1650-1750°C develops the critical ceramic bond between magnesia and zirconia phases.
Why Choose Us?
High-Quality Materials:
We use only high-purity magnesia to ensure superior performance and durability.
Advanced Manufacturing:
State-of-the-art technology and rigorous quality control guarantee consistent quality.
Custom Solutions:
Tailored products to meet specific application requirements.
Global Expertise:
Trusted by clients worldwide for reliable and innovative refractory solutions.
Competitive Pricing:
Cost-effective solutions without compromising quality.
24/7 After-Sales Support:
Our team is always available to provide technical assistance and troubleshooting.
Packing
- Magnesia zirconia bricks are typically packaged in wooden crates or pallets to ensure safe transportation and storage. Each brick is carefully wrapped to prevent damage during transit. The packaging is designed to protect the bricks from moisture and physical impact, maintaining their integrity until they reach the end-user. Proper packaging also facilitates easy handling and storage on construction sites or in industrial facilities.
FAQ
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