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High quality zero expansion silica brick for glass furnace
hot repair
Zero expansion silica bricks are also called fused silica bricks or thermal shock-resistant silica bricks.
Zero expansion silica brick has the characteristics of extremely low thermal expansion coefficient, excellent resistance to rapid cooling and heating, good high-temperature structural strength, and high SiO2 content. This product can be widely used in the rapid thermal repair projects of various coke ovens. The product does not crack and flake during use, and has close to zero low thermal expansion performance, which makes the coke oven safe and reliable for long-term use after repair.
Characteristics of Zero Expansion Silica Brick
1. SiO2 content is greater than 99%, excellent corrosion resistance
and acid resistance
2. Low Fe2O3 content is less than 0.1%, no pollution to products
(such as molten glass, etc.)
3. Low flux index (Al2O3+2R2O) is less than 0.3%
4. The thermal expansion rate is close to zero, so there is no need
to reserve expansion joints when repairing, which increases the
tightness of the masonry.
5. Excellent thermal stability, the product will not explode during
hot repair, and it can be directly repaired under the condition of
high temperature without stopping the furnace
6. After repair (hot repair), there will be no peeling, etc., and
it is safe and reliable for long-term use
High quality zero expansion silica brick for glass furnace hot repair
Advantages of zero expansion silica brick products:
1 The thermal shock is stable, the product will not burst during
hot repair, and the repair operation can be carried out directly
under the high temperature of the furnace;
2 The expansion rate is low, no need to reserve expansion joints
when repairing, increasing the tightness of the masonry;
3 No expansion at high temperature, good extreme cold and extreme
heat, high softening temperature under load;
4 High purity, no pollution to molten glass;
5 Cutting, grinding and drilling can be carried out according to
the requirements of the construction site;
6 No impurity pollution, no erosion and peeling phenomenon,
long-term use is safe and reliable;
7 The volume density is small, and compared with other hot repair
materials, it reduces the purchase cost.
Zero expansion silica brick technical data:
| Zero Expansion Silica Brick | Technical Data |
| SiO2(%) | ≥99 |
| Al2O3(%) | ≤0.3 |
| Fe2O3(%) | ≤0.1 |
| CaO(%) | ≤0.1 |
| Bulk Density(g/cm3) | ≥1.85 |
| Cold crushing strength(Mpa) | ≥30 |
| Apparent porosity(%) | ≤20 |
| Refractoriness under Load (T0.6, ℃) | ≥1650 |
| Thermal expansion(20-800℃, %) | ≤0.2 |
| Thermal shock resistance(1100℃,Water cooling, Times) | ≥30 |
High quality zero expansion silica brick for glass furnace hot repair
What is the difference between zero expansion silica brick and silica brick?
| Technical data | Typical data for zero expansion silica brick | Regular silica brick |
| SiO2(%) | 99.12 | 94-96 |
| Al2O3(%) | 0.26 | 0.8-1.0 |
| Fe2O3(%) | 0.09 | 0.5-1.0 |
| CaO(%) | - | 2.5 |
| Bulk Density(g/cm3) | 1.9 | 1.78-1.84 |
| Cold crushing strength(Mpa) | 42 | 30-50 |
| Apparent porosity(%) | 14.3 | 22-24 |
| Refractoriness under Load (T0.6, ℃) | 1665 | 1640-1660 |
| Thermal expansion(20-800℃, %) | 0.2 | 1.25 |
| Thermal shock resistance(1100℃,Water cooling, Times) | 35 | 0-1 |
Silica bricks have resistance to acid slag erosion. Higher high
temperature strength. The starting temperature of load softening is
1620~1670℃. It will not deform after long-term use at high
temperature. Low thermal shock stability (1~4 times of heat
exchange in water) Natural silica is used as raw material, and a
proper amount of mineralizer is added to promote the conversion of
quartz in the green body into phosphorite. Slowly fired at 1350~14
30℃ under reducing atmosphere. When heated to 1450℃, there will be
about 1.5% to 2.2% of the total volume expansion. This residual
expansion will make the cut joints tightly and ensure that the
masonry has good air tightness and structural strength. At the same
time, it has the advantages of long service life and reduced energy
consumption.
The expansion of zero-expansion silica bricks is almost zero, while
ordinary silica bricks will expand, and the prices of the two types
are different.
High quality zero expansion silica brick for glass furnace hot repair
Zero expansion silica bricks are widely used in high-temperature thermal equipment such as glass melting furnaces, coke ovens, and hot blast furnaces.
Especially high-temperature thermal equipment can be repaired arbitrarily without stopping the fire.
When the coke oven is partially damaged, it is often necessary to shut down the oven for repair. The thermal stability of silica bricks is poor. When the main mineral phases of silica bricks are tridymite and cristobalite and a small amount of residual quartz are at 200℃~300℃ and 573℃, the volume of the masonry will change due to the crystalline transformation of the SiO2 variant. In order to prevent the deformation and cracking of the masonry, the temperature should not be cooled too fast when the furnace is stopped, otherwise it will affect the service life of the silica brick masonry. The coke oven also requires a slow temperature rise, and the oven time is more than 80 days. The cold repair of coke ovens is difficult, time-consuming, and costly. For this reason, many coke ovens are forced to be out of service after their combustion chambers are damaged. In order to meet the development needs of hot repair of coke ovens, our company has developed good performance zero-expansion silica bricks, which solves the problem of poor thermal stability of ordinary silica bricks, and can meet the requirements of rapid heating without long ovens. After the furnace is completed Ready to use.
High quality zero expansion silica brick for glass furnace hot repair
High quality zero expansion silica brick for glass furnace hot repair
High quality zero expansion silica brick for glass furnace
hot repair
Jerry Li
Cell&WhatsApp: 0086-13373957739
Email: jerry(at)firebricks-supplies.com
