- Time:Aug 22, 2023
high alumina brick is a commonly used refractory material with excellent high temperature resistance and corrosion resistance. The following are some typical physical and chemical indicators of high alumina bricks:
1. High aluminum content: High alumina bricks are usually named after their high aluminum content, generally higher than 45%. High aluminum content can provide good fire resistance and corrosion resistance.
2. Common oxide content:
The Al2O3 (aluminum oxide) content is usually between 50% and 99%. Higher alumina content provides better high temperature stability and corrosion resistance.
The SiO2 (silicon dioxide) content is generally less than 25%, and the lower content helps to lower the melting point and improve corrosion resistance.
The Fe2O3 (iron oxide) content is usually kept low because it may have an adverse effect on refractory properties.
3. Common density range: The density of high alumina bricks is usually between 2.0 g/cm³ and 3.0 g/cm³, depending on the formula and processing.
4. Compressive strength: The compressive strength of high alumina bricks is usually between 50 MPa and 150 MPa at room temperature, which makes it able to withstand high temperature and mechanical load.
5. Load softening temperature: The load softening temperature of high alumina bricks is generally higher, usually above 1500°C, which makes it suitable for high temperature industrial environments.
6. Thermal expansion coefficient: The thermal expansion coefficient of high-alumina bricks is generally low, which means that its dimensional change is relatively small during heating and cooling.
Physical and chemical indicators of high alumina bricks produced by zhenjin
| Composite portion | SK38 | SK36 | |
| Chemical Composition wt% |
Al₂O₃ | ≥70 | ≥55 |
| Fe₂O₃ | ＜2.0 | ＜2.0 | |
| Bulk Density, g/cm³ | 2.5 | 2.15 | |
| Apparent Porosity, % | ≤24 | ≤24 | |
| Cold Crushing Strength, Mpa | ≥60 | ≥45 | |
| Refractoriness under Load,°C （0.2Mpa, t0.6) |
≥1460 | ≥1420 | |
| Refractoriness, °C | ≥1510 | ≥1430 | |
| Linear change reheating, % | -0.4 | -0.4 | |
Physical and chemical indicators of Spalling resistant high alumina bricks by zhenjin
| Composite portion | GKBL-70 | KBL-70 | |
| Chemical Composition wt% |
Al₂O₃ | ≥70 | ≥70 |
| ZrO₂ | ≥6 | —— | |
| Fe₂O₃ | ≤1.5 | ≤1.5 | |
| Bulk Density, g/cm³ | ≥2.55 | ≥2.55 | |
| Apparent Porosity, % | ≤22 | ≤20 | |
| Cold Crushing Strength MPa |
≥60 | ≥60 | |
| Refractoriness under Load, ℃ (0.2MPa, t0.6) |
≥1470 | ≥1470 | |
| Thermal Shock Test, Cycle (1100℃, water quenching) |
≥20 | ≥15 | |
Physical and chemical indicators of low creep high alumina bricks produced by zhenjin
| Item | DRL-155 | DRL-150 | DRL-145 | DRL-140 | DRL-135 | DRL-130 |
| Al₂O₃, % | ≥75 | ≥75 | ≥65 | ≥65 | ≥65 | ≥60 |
| Apparent Porodity % |
≤20 | ≤21 | ≤23 | ≤24 | ≤24 | ≤25 |
| Bult Density, g/cm³ | 2.60-2.85 | 2.60-2.85 | 2.50-2.70 | 2.40-2.60 | 2.35-2.55 | 2.30-2.50 |
| Cold Crushing Strength MPa |
≥60 | ≥60 | ≥50 | ≥45 | ≥45 | ≥40 |
| Creep rate at 0.2MPa×50h % |
≤1550℃ 0.8 |
≤1550℃ 0.8 |
≤1450℃ 0.8 |
≤1400℃ | ≤1350℃ | ≤1300℃ |
| Linear change reheating % |
1500℃×2h ≤-0.2~0.2 |
1450℃×2h ≤-0.2~0.2 |
1450℃×2h ≤-0.3~0.2 |
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These specifications may vary according to different manufacturers, product specifications and application needs. Therefore, when selecting high alumina bricks, it is recommended to refer to the technical specification sheet of the specific product and the information provided by the supplier to ensure that the material suitable for the specific application is selected.
