Magnesia brick High compressive strength at room and high temperatures, resistant to alkali slag erosion, high thermal conductivity. Used in key parts of glass melting furnaces, linings of steel making converters, and refractory linings of non ferrous metal smelting furnaces.
Magnesite bricks are basic refractory materials with magnesium oxide (MgO) as the main crystal phase. They are made by calcining magnesite into magnesia, followed by batching, shaping, and high - temperature firing. They are the core refractory lining materials for high - temperature industrial kilns.
Features and Properties
| Project | M - 98 | M - 97A | M - 97B | M - 95A | M - 95B | M - 93 | M - 91 | M - 89 | M - 87 |
| ω(MgO)/% ≥ | 97.5 | 97 | 96.5 | 95 | 94.5 | 93 | 91 | 89 | 87 |
| ω(SiO₂)/% ≤ | 1 | 1.2 | 1.5 | 2 | 2.5 | 3.5 | — | — | — |
| ω(CaO)/% ≤ | — | — | — | 2 | 2 | 2 | 3 | 3 | 3 |
| Apparent Porosity /% | 16 | 16 | 18 | 16 | 18 | 18 | 18 | 20 | 20 |
| Bulk Density /(g/cm³) | 3.00 - 3.20 | 3.00 - 3.20 | 2.95 - 3.15 | 2.90 - 3.10 | 2.85 - 3.02 | ||||
| Compressive Strength at Normal Temperature /MPa ≥ | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 50 | 50 |
| Initial Softening Temperature under 0.2MPa Load / °C ≥ | 1700 | 1700 | 1650 | 1620 | 1560 | 1550 | 1540 | ||
| Permanent Linear Change after Heating (1650 °C × 2h) /% | -0.2 - 0 | -0.2 - 0 | -0.3 - 0 | -0.4 - 0 | -0.5 - 0 | -0.6 - 0 | — | ||
MgO:85-88%;
Bulk Density:2.95g/cm³;
Cold Crushing Strength:≥80MPa;
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