Fused Cast Mullite Bricks
Fused Cast Mullite Bricks are made of high-quality mullite clinker as raw material, which is melted and cast at high temperatures in an electric arc furnace.
The refractory fire bricks are characterized by dense crystal structure, high load softening temperature, good thermal shock resistance, high mechanical strength at room temperature and high temperature, good abrasion resistance, good thermal conductivity, and strong resistance to slag corrosion, etc. The bricks are widely used in metallurgical heating furnaces, even heat furnaces, calcium carbide furnaces, and calcium carbide furnaces. Electrofused mullite is widely used in metallurgical heating furnaces, even heat furnaces, calcium carbide furnace outlets, glass kiln walls, and so on.
PER Refractories produces standard refractory bricks and customized-shaped refractory bricks. High quality and cheap price are our advantages. You can contact us for a free quote in time.
Fused Cast Mullite Bricks Typical Physical Properies
| Al2O3 max (%) | 70-75 |
| SiO2 min (%) | 19-21 |
| Fe2O3 max (%) | 0.9-1.9 |
| Na2O max (%)a | 1.0-1.2 |
| True Specific Gravity | 3.54 g/cm |
| Cold Crushing Strength | 350 Mpa |
| Thermal Expansion at 1150℃ | 0.80% |
| Thermal Conductivity at 500-1500℃ | 4.6W/m.K |
| Porosity | 8% |
Composition of Fused Cast Mullite Bricks
Fused mullite generally includes high purity fused mullite and ordinary fused mullite. Compared with sintered fused mullite, fused mullite has coarse crystals of 1000 to 2000. high-purity fused mullite is light gray, and ordinary fused mullite is dark gray (bauxite is the main raw material).
PER refractories factory can customize high purity fused mullite and ordinary fused mullite according to customers’ requirements. We also produce corundum mullite bricks and other types of refractory bricks.
Fused Cast Mullite Bricks are made of high alumina isotopes, composed of different alumina (3AL203.2Si02 mass fraction of AL2O372% and Si0228%). It is melted at about 2300°C and cast in a sand mold at 1850°C, then annealed to relieve stress.
The main crystalline phase is mullite and corundum, and the glass phase is filled between the crystalline phases. It is more resistant to glass liquid erosion than sintered refractories, but not as good as other electrofused refractories.
Adding a small amount of dioxygen (7%-8.5%) can make mullite crystals smaller, brick organization dense, mullite amount increased to 60%-70%, relatively reduce the glass phase content, reduce product cracks. Fused Cast Mullite Bricks have a low coefficient of thermal expansion, good resistance to thermal vibration, and strong resistance to glass liquid erosion.
Above 1450 ℃, mullite brick should not contact with alkali substances, otherwise it will make mullite decomposition. Mullite will also decompose in the reducing atmosphere above 1370℃, and part of Si02 becomes gaseous SiO to leave the brick body.
When the temperature is higher than 1650°C, even if the atmosphere is not restored, the mullite will decompose at a lower partial pressure of oxygen.
Fused Cast Mullite Bricks are made from high alumina isotopes, and different alumina is formulated to form the composition of mullite (3AL203-2Si02 mass fraction is: AL2O3 72%, Si02 28%). It is melted at about 2300°C, poured into the sand mold at thousand 1850°C, and then annealed to eliminate stress.
The main crystalline phase is mullite and corundum, the glass phase is filled in between the crystalline phase. Its resistance to glass liquid erosion is stronger than sintered refractories, but not as strong as other electrofusion refractories.
Add a small amount (7%-8.5%) of enamel dioxide, which can make the mullite crystals become a smaller, dense brick organization, the amount of mullite increased to 60%-70%, relatively reducing the content of the glass phase, and reduce the cracks of the products.
About PER Refractories Company
PER Refractories Company is located in Xinmi City, Henan Province, the hometown of refractory materials in China. Our company is a technology-based refractory enterprise integrating R&D, production, sales, and technical service. The rich resources and excellent quality in the territory provide unparalleled superior conditions for the production of refractory materials. Our main products are refractory clay bricks, high alumina refractory bricks, refractory silica bricks, magnesium refractory bricks, mullite bricks, insulation bricks, and other high-temperature-resistant products.
PER considers the most important thing, we believe in taking every product seriously and receiving every customer sincerely. To provide fast and high-quality results for all our customers. PER Refractories will be your most trustworthy refractory manufacturer and reliable partner.
Company PER refractory is the production base of green, energy-saving, and environment-friendly new refractory materials. Our company has passed ISO9001:2008 international quality system certification and GB/T24001-2004 / ISO14001:2004 environmental management system certification, enterprise-quality inspection agency certification. Our products are sold well in more than 20 countries all over the world. They are the preferred refractory products for metallurgy, non-ferrous, petrochemical, glass, ceramics, and other refractory industries.
