Application

Sintered Bricks Used in Glass Furnaces and Their Core Reasons

1. High-Purity Dense Silica Bricks (SiO₂≥96%)
Core reason: Top-grade material for the crown of glass furnaces, resistant to high temperatures of 1600℃+, with a load softening temperature close to the refractoriness, extremely low high-temperature creep, and capable of long-term load-bearing without deformation; compatible with glass components without contaminating the molten glass, and its resistance to alkaline vapor corrosion is far superior to ordinary silica bricks, directly determining the lifespan of the melting furnace, making it a must-have for high-end float glass furnaces.

2. High-Alumina Bricks (Al₂O₃≥80%, Corundum-Mullite Phase)
Core reason: Resistant to 1550-1650℃, high density, high strength, strong thermal shock resistance/erosion resistance; suitable for key stress-bearing parts such as the arch foot and breast wall, with corrosion resistance improved by more than 30% compared to 75% high-alumina bricks, and better high-temperature volume stability, eliminating the risk of structural loosening.

3. Sillimanite Bricks
Core reason: Sintered from high-purity sillimanite, with sufficient mullitization at high temperatures, resistant to 1500-1580℃, and its resistance to alkali corrosion and thermal shock is far superior to ordinary high-alumina bricks; mainly used in the breast wall and burner transition zone, it can withstand high-frequency flame erosion, and its service life is 1.5-2 times that of ordinary high-alumina bricks.

4. Mullite Bricks (Al₂O₃ 70%-85%, Mullite crystal phase ≥60%)
Core reason: Resistant to 1450-1600℃, with excellent thermal insulation and refractoriness, and a thermal conductivity 20% lower than high-alumina bricks; suitable for the outer side of the arch and high-temperature flues, balancing thermal insulation and energy saving with structural stability, with a low high-temperature creep rate, and does not powder or peel off during long-term use, meeting the energy-saving needs of high-end furnaces.

5. Andalusite Bricks
Core reason: Andalusite decomposes and mullitizes at high temperatures, and the slight volume expansion can offset the shrinkage of the kiln body. It is resistant to temperatures above 1500℃, and has extremely strong thermal shock resistance and alkali corrosion resistance; mainly used in the high-temperature section of the regenerator and the burner lining, it can cope with sudden temperature changes, is not prone to cracking, and has very low maintenance costs.

6. Sintered AZS Bricks (Zirconia-Alumina Sintered Bricks)
Core parts: Upper part of the melting furnace pool wall (near the liquid level), charging port lining, upper edge of the liquid flow hole
Secondary parts: Burner transition zone, high-temperature section lattice of the regenerator
Key reasons: Resistant to 1600-1700℃, strong resistance to glass melt corrosion/alkali vapor corrosion, high density; lower cost than fused cast AZS, superior corrosion resistance compared to ordinary high-alumina bricks, suitable for medium-to-high-end float glass kilns with moderate corrosion conditions. Using it at the liquid level can reduce the risk of glass melt stones.

Core Common Characteristics of High-Grade Sintered Bricks

◈ Pure raw materials: Using high-purity bauxite, silica, sillimanite and other high-quality raw materials to avoid contaminating the glass melt at high temperatures
◈ Strong performance: Higher temperature resistance, far superior corrosion resistance/thermal shock resistance/creep resistance compared to ordinary bricks, suitable for long-term continuous high-temperature conditions in glass kilns
◈ Long lifespan: The service life is 1.2-2.5 times that of ordinary sintered bricks, reducing the frequency of kiln shutdowns for maintenance, and indirectly increasing production capacity

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