A magnesia carbon brick is a composite refractory material made from high-purity magnesia (MgO) and high-quality graphite (carbon). The carbon content provides excellent thermal shock resistance, while the magnesia ensures superior refractoriness and slag corrosion resistance. These bricks are bonded with resin, which improves their mechanical strength and resistance to oxidation during high-temperature operations.
Technical Specifications
| Property | Typical Range |
|---|---|
| Magnesia Content (MgO) | 70% – 98% |
| Carbon Content (C) | 8% – 20% |
| Bulk Density | 2.85 – 3.10 g/cm³ |
| Apparent Porosity | ≤ 5% |
| Cold Crushing Strength | ≥ 40 MPa |
| Refractoriness | ≥ 1700℃ |
| Thermal Shock Resistance | Excellent |
| Application Temperature | Up to 1800℃ |
Key Features
High Thermal Shock Resistance
The combination of magnesia and graphite gives the brick the ability to endure rapid temperature changes without cracking or spalling.Excellent Slag Corrosion Resistance
The low wettability of graphite helps prevent penetration by molten slag, reducing erosion and extending the brick’s service life.Superior Mechanical Strength
Magnesia carbon bricks maintain structural integrity under high mechanical loads, making them ideal for demanding ladle applications.Low Thermal Conductivity
This property minimizes heat loss during steel handling, improving energy efficiency and maintaining ladle temperature stability.Extended Service Life
Due to their resistance to abrasion and chemical attack, magnesia carbon bricks last longer than many conventional refractory materials, lowering maintenance costs.
Typical Applications
Magnesia carbon bricks are widely used in various ladle lining zones due to their unique properties:
Slag Line Area
This is the most vulnerable section of the ladle, where molten slag and steel meet. Magnesia carbon bricks resist chemical attack, thermal shock, and mechanical abrasion, ensuring long-lasting performance.Working Layer
Since this layer is in direct contact with molten steel, high-quality bricks are essential to prevent premature failure. Magnesia carbon bricks provide the necessary strength and corrosion resistance.Transition Zones
Areas where temperature and chemical conditions fluctuate benefit from the excellent spalling resistance of magnesia carbon bricks.
Production Details
Raw Material Selection
High-purity magnesia (MgO) with low impurities.
Flake graphite with high carbon content for thermal shock resistance.
Anti-oxidation additives (e.g., Al, Si, B₄C) to improve high-temperature stability.
Mixing & Forming
Raw materials are mixed with resin binder under strict proportion control.
Formed into shapes using high-pressure presses to ensure density and uniformity.
Heat Treatment
Controlled baking process to cure resin and develop bonding strength.
No firing at high temperatures to retain carbon content.
Quality Inspection
Bulk density, porosity, crushing strength, and chemical composition are tested.
Thermal shock and slag corrosion resistance evaluated for each batch.
Packaging & Delivery
Bricks are packaged on wooden pallets with protective wrapping.
Customized shapes and sizes available based on ladle design.
Packing and Shipping Details
Packaging:
Each batch of magnesia carbon bricks is carefully packed on fumigation-free wooden pallets or in sturdy crates. The bricks are securely stacked and wrapped with waterproof film to protect against moisture and dust during transit. Steel straps reinforce the packaging to prevent shifting or damage.Shipping Methods:
We offer flexible shipping options tailored to customer needs, including sea freight, air freight, and express courier services. Shipping routes and logistics are optimized to ensure timely and safe delivery worldwide.
Frequently Asked Questions (FAQ)
Q1: What is the main advantage of magnesia carbon bricks in ladles?
Magnesia carbon bricks offer excellent thermal shock resistance, slag corrosion resistance, and high refractoriness, making them ideal for high-temperature ladle applications.
Q2: What is the maximum working temperature for magnesia carbon bricks?
They can withstand temperatures up to 1800℃, depending on grade and composition.
Q3. Can magnesia carbon bricks be customized for different ladle sizes?
Yes. Xintai provides customized shapes, dimensions, and technical specifications to match specific ladle designs and operating conditions.
Q4: How long is the service life of magnesia carbon bricks in a ladle?
Service life depends on operating conditions, slag chemistry, and maintenance, but high-quality bricks can significantly extend ladle lining life compared to conventional materials.
Q5: Are antioxidant additives necessary in magnesia carbon bricks?
Yes. Additives like aluminum, silicon, or boron carbide improve oxidation resistance and overall brick durability in harsh steelmaking environments.
