- Time:Aug 21, 2023
Magnesia chrome brick is a refractory material made of magnesium oxide (MgO) and chromium oxide (Cr2O3) as the main components. The following is an introduction to the physical and chemical indicators of magnesia-chrome bricks:
1. Density: The density of magnesia-chrome bricks is usually between 3.2-3.6 g/cm³, and the specific value may be affected by the preparation process and formula.
2. Compressive strength: Magnesia-chrome bricks have high compressive strength, usually between 100-200 MPa, and the specific value depends on the composition, structure and processing method of the material.
3. Refractoriness: Magnesia-chrome bricks have very high refractoriness and can be used for a long time in a high temperature environment above 1500°C. It can withstand extreme thermal cycling and thermal shock.
4. Thermal expansion coefficient: The thermal expansion coefficient of magnesia-chrome bricks is relatively low, usually in the range of 3-5 × 10^-6/℃. This allows it to maintain good dimensional stability at high temperatures.
5. Chemical corrosion resistance: Magnesia-chrome bricks have good chemical corrosion resistance to acidic and alkaline conditions, and can resist the erosion of many acids, alkalis and solvents. It also has good corrosion resistance in some sulfur-containing fuel gas environments.
6. Thermal conductivity: Magnesia-chrome bricks have high thermal conductivity and can conduct heat quickly. This makes it useful as a heat sink or heat transfer medium in some applications.
The physical and chemical indicators of magnesia-chrome bricks produced by zhenjin
| Brand | Mge-8 | Mge-10 | Mge-12 | Mge-16 | Mge-18 | |
| Cr₂O₃, % | ≥8 | ≥10 | ≥12 | ≥16 | ≥18 | |
| Apparent Porosity, % | ≤22 | ≤22 | ≤20 | ≤18 | ≤18 | |
| Bulk Density, g/cm³ | ≤2.95 | ≤3.00 | ≤3.05 | ≤3.1 | ≤3.1 | |
| Cold Crushing Strength MPa |
≥35 | ≥35 | ≥35 | ≥35 | ≥35 | |
| Refractoriness under Load, ℃ (0.2MPa, T0.6) |
1550 | 1580 | 1600 | 1650 | 1650 | |
| Thcrmal Shock Test,Cycle (1100℃，water quenching） |
≥4 | ≥4 | ≥4 | ≥4 | ≥4 | |
It should be noted that the specific physical and chemical indicators may vary depending on the manufacturer, product type and specification. In specific applications, it is also necessary to select suitable magnesia-chrome bricks according to actual needs, and refer to relevant technical specifications and data provided by suppliers.
