Sintered mullite brick has excellent high-temperature performance, high strength, high refractoriness under load, excellent thermal shock stability, good chemical stability, and good corrosion resistance to acidic and alkaline slag.
Specification of sintered mullite brick
| Item | Index | |||
| SM65 | SM70 | SM75 | SM80 | |
| Al2O3 % | ≥64 | ≥68 | ≥74 | ≥78 |
| Fe2O3 % | ≤1.2 | ≤1.2 | ≤1.0 | ≤0.8 |
| Apparent Porosity % | ≤18 | ≤18 | ≤17 | ≤16 |
| Bulk Density g/cm3 | ≥2.45 | ≥2.50 | ≥2.60 | ≥2.75 |
| Cold Crushing Strength MPa | ≥60 | ≥70 | ≥75 | ≥85 |
| 0.2Mpa Refractoriness Under Load ℃ | ≥1580 | ≥1600 | ≥1650 | ≥1700 |
| Permanent Linear Change Rate % 1500℃×2h | -0.4~+0.1 | -0.3~+0.1 | -0.2~+0.1 | |
Characteristics of sintered mullite bricks
- Low thermal conductivity and heat capacity.
- High purity and low impurity content.
- High temperature resistance and can directly contact flames.
- High strength and excellent thermal shock resistance.
Uses of sintered mullite bricks
Sintered mullite bricks can be used for high-temperature hot blast stoves, large blast furnace hearths, and bottoms, steelmaking electric furnace tops, ceramic industrial kiln lining, kiln furniture, glass kiln cement kiln lining
Comparison between sintered mullite bricks and fused mullite bricks
Sintered mullite bricks have higher mechanical strength and load deformation temperature, high density, low porosity, high crystalline phase content, and no abnormality in the thermal expansion curve. Generally speaking, the high-temperature flexural strength of sintered mullite bricks is higher than that of fused mullite bricks. This is due to the existence of some small but well-developed crystal networks in the structure. Sintered mullite bricks have good volume stability and good creep resistance due to their larger crystals.
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