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Refractory Mullite Brick
Mullite brick refers to a high alumina refractory material with mullite as the main crystal phase. The alumina content is between 65% and 75%. In addition to mullite, the mineral composition contains a small amount of vitreous phase and cristobalite with lower alumina content;
Description
1.The composition of mullite bricks
Mullite brick has high refractoriness, which can reach above 1790℃. Under load softening start temperature 1600 ~ 1700 ℃. Normal temperature compressive strength 70 ~ 260MPa. Good thermal shock resistance. There are two types of sintered mullite bricks and fused mullite bricks.
2.Hot spots for mullite bricks
Mullite bricks with higher alumina content also contain a small amount of corundum. Mainly used for hot blast stove top, blast furnace shaft and bottom, glass melting furnace regenerator, ceramic sintering kiln, dead angle lining of petroleum cracking system, etc.
3.Technical Parameter
Item | 75 Mullite Brick | 70 Mullite Brick | Mullite-corundum Brick |
Al2O3 % | ≥75 | ≥70 | ≥80 |
SiO2 % | ≤23 | ≤25 | ≤18 |
Fe2O3 % | ≤0.4 | ≤0.4 | ≤0.3 |
Bulk Density g/cm3 | ≥2.7 | ≥2.6 | ≥2.8 |
Apparent porosity % | ≤18 | ≤18 | ≤18 |
Cold compressive strength MPa | ≥100 | ≥100 | ≥100 |
(0.2Mpa,0.6%)Load softening began to temperature °C | ≥1680 | ≥1680 | ≥1700 |
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