Hot Sale High Quality 40% Alumina Refractory Bricks SK32 SK34 Fire
Clay Brick For Heat Exchange Positions
Clay brick is a type of refractory brick made from clay that is
high in alumina content (30-40%). It is composed of a mixture of
mullite (3Al2O3·2SiO2), glass phase (25-60%), quartzite, and quartz
(up to 30%).
Clay bricks can be classified into three types based on their
alumina content:
First class: Al2O3 > 40%
Second class: Al2O3 > 35%
Third class: Al2O3 > 30%
The corresponding refractoriness of these bricks is at least
1700°C, 1670°C, and 1610°C, respectively. The softening temperature
under load is between 1250°C and 1450°C. Clay bricks have good
thermal stability and are generally used in the drying zone,
preheating zone, decomposition zone, and cooling machine of rotary
kilns.
In recent years, many countries have developed special clay bricks
with improved fire resistance temperature and alkali resistance.
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Physical and Chemical Properties of Fire Clay brick
Clay bricks are made from clay clinker and refractory clay. They
are suitable for use in heat exchange positions, chain belts,
decomposition zones, cooling zones, smoke chambers, and grate
coolers. Clay bricks have good wear resistance, low thermal
conductivity, and are relatively inexpensive. However, they have
lower fire resistance and strength than other types of refractory
bricks.
Here Are Some of The Key Physical and Chemical Properties of
Fireclay Bricks:
Refractoriness: The temperature at which a clay brick will soften
or melt. Clay bricks typically have a refractoriness of
1610-1700°C.
Softening temperature under load: The temperature at which a clay
brick will deform under a specific load. Clay bricks typically have
a softening temperature under load of 1250-1450°C.
Thermal conductivity: The rate at which heat is transferred through
a material. Clay bricks have a low thermal conductivity, which
makes them ideal for use in heat exchange applications.
Porosity: The percentage of the volume of a clay brick that is
occupied by pores. Clay bricks typically have a porosity of 20-30%.
This porosity helps to absorb moisture and release it slowly, which
helps to prevent thermal shock.
Alkali resistance: The ability of a clay brick to resist attack by
alkalis, such as sodium and potassium oxides. Clay bricks with a
high alumina content have good alkali resistance.
Applications of SK32 SK34 Fire Clay Brick:
1. Furnaces of metallurgy industry, heat treatment furnace
2. Furnaces of chemical industry and construction industry.
3. Furnace of incineration of garbage, recirculating fluidized bed
furnace
Standard sizing: 230 x 114 x 65 mm others up to the client
Product Specification of High Quality Refractory Bricks SK32 SK34
Fire Clay Brick
Standard sizing: 230 x 114 x 65 mm ,Special size and OEM Service
also provide!
The size is precise, providing kinds of shapes according to
customer's drawing
| Item/Grade | SK-32 | SK-34 | SK-36 | SK-37 | SK-38 |
| AL2O3 % (≥) | 35 | 38 | 55 | 65 | 70 |
| Fe2O3 % (≤) | 2.5 | 2.5 | 2 | 2 | 2 |
| Refractoriness(SK) | 32 | 34 | 36 | 37 | 38 |
| Refractoriness under load, 0.2MPa, °C(≥) | 1300 | 1360 | 1450 | 1480 | 1530 |
| Apparent porosity (%) | 22-24 | 20-22 | 20-23 | 20-23 | 20-22 |
| Bulk density (g/cm³) | 1.95-2.1 | 2.1-2.2 | 2.25-2.4 | 2.3-2.5 | 2.4-2.6 |
| Cold crushing strength ,MPa (≥) | 25 | 30 | 45 | 50 | 60 |
| Thermal expansion at 1000°C (%) | 0.6 | 0.6 | 0.3 | 0.3 | 0.2 |
