Description
Magnesia brick is an alkaline refractory brick made primarily from high-purity sintered magnesia or fused magnesia, manufactured through high-temperature sintering or chemical bonding processes. These bricks offer excellent high-temperature performance, corrosion resistance and strength, making them widely used in high-temperature industrial-especially in equipment exposed to molten metals or strongly alkaline environments.
Specification
| Item | Grade | ||||||
| M—98 | M—97A | M—97B | M—95A | M—95B | M—91 | M—89 | |
| ω(MgO)/%≥ | 97.5 | 97.0 | 96.5 | 95.0 | 94.5 | 91.0 | 89.0 |
| ω(SiO₂)/%≤ | 1.00 | 1.20 | 1.50 | 2.00 | 2.50 | — | — |
| ω(CaO)/%≤ | — | 2.00 | 2.00 | 3.00 | 3.00 | ||
| Apparent Porosity/%≤ | 16 | 16 | 18 | 16 | 18 | 18 | 20 |
| Bulk density/(g/cm³)≥ | 3.00 | 3.00 | 2.95 | 2.90 | 2.85 | ||
| Cold Crushing Strength /MPa≥ | 60 | 60 | 60 | 60 | 50 | ||
| 50 | 50 | 50 | 50 | 45 | |||
| Refractoriness Under Load / 0.2 MPa T0.6/℃≥ | 1700 | 1700 | 1650 | 1560 | 1500 | ||
| Permanent Linear Change on Heating/% | 1650℃×2h —0.2～0 | 1650 ℃×2 h —0.3～0 | 1600 ℃×2 h —0.5～0 | 1600 ℃×2 h —0.6～0 | |||
Applications
Mainly used as lining material for steel-making furnaces, especially in converters and electric arc furnaces, and also applicable in industries such as lime and chemical.
