Characteristics of Magnesia-Chrome Bricks

Magnesia-Chrome Bricks are typical alkaline refractory materials. Their core characteristics are determined by the crystal structure and chemical properties of MgO and Cr₂O₃. They focus on high-temperature resistance, corrosion resistance, and strong structural stability. These key characteristics are categorized into five key categories:

1. Excellent High-Temperature Mechanical Properties

High Refractoriness: Generally ≥1800°C (high-purity products reach 1900°C), far exceeding that of ordinary clay bricks and capable of withstanding sustained high temperatures.

High-Load Softening Temperature: ≥1600°C under a load of 0.2 MPa (1650-1700°C for high-quality products). Magnesia-Chrome Bricks are not susceptible to deformation or collapse at high temperatures, making them suitable for “high-temperature + load” applications.

High-Temperature Volume Stability: High-Temperature Linear Change Rate ≤1%, minimal volume shrinkage/expansion, and resistance to cracking.

2. Strong Chemical Resistance

Alkaline Slag Resistance: Forms a dense reaction layer against alkaline slag from cement kilns and non-ferrous metal smelting, preventing penetration and spalling. Acidic Slag Resistance (relative): Cr₂O₃ makes it more resistant to weakly acidic slag (such as low-silicon slag) than pure magnesia bricks.

Gas Corrosion Resistance: The dense structure reduces the penetration of harmful gases such as CO and SO₂, minimizing cavitation damage.

3. Excellent Physical Stability

High Compressive Strength: ≥50MPa at room temperature (60-80MPa in areas susceptible to impact), resistant to mechanical impact and wear.

Low Porosity: ≤16% for high-quality products (≤12% for dense types), reducing penetration, improving wear resistance, and extending service life.