Clay bricks are divided by use and are mainly divided into clay refractory bricks for blast furnaces, clay refractory bricks for hot blast furnaces, and large clay refractory bricks for coke ovens and glass kilns.
Fire clay brick is a common refractory material used in construction and industrial applications in high temperature environments. Fire Clay bricks are made of kaolin (fire clay) and other refractory materials, which are formed, dried and sintered at high temperature. The main component of fire clay bricks is kaolin, which is a clay ore containing aluminum and silicon. Kaolin has excellent fire resistance and chemical stability, and can resist chemical attack at high temperature. In addition, other refractory materials such as quartz, gypsum, silica sand, etc. may be added to the fire brick to enhance its performance.
| Item/Grade | PN-42 | PN-40 | PN-35 | PN-30 | PN-25 | |
|---|---|---|---|---|---|---|
| ω (Al2O3)/% | μ0 ≥ | 42 | 40 | 35 | 30 | 25 |
| σ | 2.5 | |||||
| ω (Fe2O3)/% | μ0 ≤ | 2.0 | / | / | / | / |
| σ | 0.4 | |||||
| Apparent Porosity/% | μ0 ≤ | 20 (22) | 24 (26) | 26 (28) | 23 (25) | 21 (23) |
| σ | 2.0 | |||||
| Cold Crushing Strength/MPa | μ0 ≥ | 45 (35) | 35 (30) | 30 (25) | 30 (25) | 30 (25) |
| Xmin | 35 (25) | 25 (20) | 20 (15) | 20 (15) | 20 (15) | |
| σ | 10 | |||||
| 0.2MPa Refractoriness Underload T0.6/℃ | μ0 ≥ | 1400 | 1350 | 1320 | 1300 | 1250 |
| σ | 13 | |||||
| Permanent Linear Change/% | U-L | 1400℃*2h -0.4-0.1 | 1350℃*2h -0.4-0.1 | 1300℃*2h -0.4-0.1 | 1300℃*2h -0.4-0.1 | 1250℃*2h -0.4-0.1 |
1.Refractory Performance,as high as 1690~1730°C 2.Thermal Insulation Performance 3.Excellent Thermal Stability 4.Excellent Chemical Corrosion Resistance
Clay refractory bricks are extensively applied in steel – making furnaces, glass – melting kilns, and cement rotary kilns due to their excellent heat – resistance.
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