Surface Porosity 24-27% Custom Size Refractory Brick
Refractory brick
Refractory bricks are blocks of refractory ceramic materials used for lining furnaces, kilns, stoves and fireplaces. Refractory bricks are mainly designed to withstand high heat, but usually should also have low thermal conductivity to save energy. Generally, dense bricks are used in applications with extremely high mechanical, chemical or thermal stresses, such as the interior of wood burning kilns or furnaces. These materials are susceptible to wood abrasion, ash or slag slag and high temperatures. Dense refractory bricks have a high thermal mass, which is sometimes a useful attribute because after the fire is extinguished, they will retain heat in, for example, a pizza oven. Kiln bricks are made by firing a clay-based composition in a kiln until it is partially vitrified. For special purposes, it can also be glazed. Refractory bricks usually contain 30% to 40% alumina, and the main raw material is usually clay with other materials. The maximum use temperature increases with the increase of alumina content, and kiln bricks with alumina content above 80% can be obtained.
Specifications:
Technical data
| Item |
SK-30 |
SK-32 |
SK-34 |
SK-36 |
SK-38 |
| AL2O3 % (min) |
30-35% |
35-38% |
38-42% |
50-55% |
60-65% |
| Fe2O3% (max) |
3 |
3 |
2.8 |
2.5 |
2.3 |
| Refractoriness |
≥1670°C |
≥1690°C |
≥1710°C |
≥1750°C |
≥1770°C |
| Refractoriness under load, 0.2MPa, (°C) |
≥1270 |
≥1350 |
≥1350 |
≥1430 |
≥1450 |
| Apparent porosity (%) |
20-24 |
20-24 |
19-23 |
18-22 |
18-22 |
| Bulk density (g/cm³) |
2.00-2.05 |
2.05-2.1 |
2.1-2.15 |
2.15-2.25 |
2.25-2.35 |
| Cold crushing strength (MPa) |
≥25 |
≥30 |
≥35 |
≥45 |
≥50 |
| Thermal expansion at 1000°C (%) |
≤0.6 |
≤0.55 |
≤0.55 |
≤0.4 |
≤0.4
|
Low-density refractory bricks
In other less demanding situations (such as natural gas kilns), perforated bricks are a better choice, usually called insulating bricks. They are weaker, but much lighter than lightweight bricks, easier to form, and have better thermal insulation. In this case, their thermal mass is low and therefore cannot be used to store heat. Insulation bricks have better thermal shock resistance than dense refractory bricks, but the main disadvantage is low strength. The thermal insulation properties of these bricks usually come from perlite or verstone. Like dense refractory bricks, there are a series of grades corresponding to different maximum service temperatures. The most common is 23 – 1260 oC.
Applications:
1. Carbon bake furnaces in the aluminum industry
2. Preheat zones and cyclones of rotary cement kilns
3. Insulation for glass tanks
4. Fireplace and pizza ovens
5. Coke ovens
6. Blast furnaces
7. Reheating furnaces
8. Suspended roofs
9. Lime kilns
10. Chimney
Our refractory bricks include various
Fireclay brick, composed of 30% to 45% alumina, is a hard "super duty" fire clay brick
High alumina bricks for steel/ironmaking furnaces, glass furnaces, ceramic tunnel kilns, cement kilns, etc.
Alumina foam bricks with excellent insulation properties and high thermal strength up to 1800°C
Acid-resistant brick or acid-resistant brick, chemical resistance, heat resistance
High-purity alumina spinel bricks or rotary kiln bricks made of common raw materials
AZS brick or ZrO2 brick for sodium silicate furnace, ceramic furnace, glass furnace and other applications
Corundum bricks, special high alumina refractory bricks
Insulation refractory brick or IFB for high temperature insulation
Magnesite bricks are used for regenerator inspection work and walls
High-strength corrosion-resistant mullite bricks for the upper structure of the glass bath
Silica bricks for the roof and superstructure of the glass melting pool, and thermal repair
Silicon carbide / SiC brick / silicon nitride bonded silicon carbide has excellent thermomechanical strength-high thermal conductivity, high bending strength, good thermal shock resistance, small pore size, low gas permeability, to molten metal Excellent permeability with slag and low wettability
Zircon bricks have excellent heat resistance, high compressive strength and excellent thermal shock resistance
