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High-Quality Fused Cast α-β-Alumina Block (RTK-M) - Leading China Suppliers & Factory for Glass Furnaces
Brief Introduction
Fused and cast alumina products are alumina series fused and cast blocks made of high-purity alumina raw materials, which are melted in an electric arc furnace at a high temperature above 2000℃. Due to the use of high-purity raw materials, less impurities and almost no matrix glass phase, it has excellent low contamination performance to the molten glass.
The crystal phase structure of the fused alumina series is composed of α-alumina and β-alumina, which has different composition ratios. The products of different varieties have different properties and can meet different operating conditions. According to its crystal phase structure, it is divided into α-β corundum brick (RTK-M), β-corundum brick (RTK-H) and α-corundum brick (RTK A).
RTK-M is composed of about 50% each of α-alumina and β-alumina, and the interlocking of the two crystals forms a very dense structure with excellent resistance to strong alkalis. Its resistance to erosion of molten glass is comparable to that of AZS in the temperature range below 1350℃. Since it contains almost no impurities such as Fe₂O₃ and TiO₂, the matrix glass phase is very small, and it has the excellent property of not contaminating the molten glass by minimizing the occurrence of foreign matter such as bubbles when in contact with the molten glass.
Therefore, it is the most suitable for working pool wall, pavement, material channel and channel of high-grade glass furnace.
Chemical Composition
| CHEMICAL COMPOSITION | TYPICAL VALUE |
| AI₂O₃% | 94.0 |
| Na₂O% | 4.0 |
| SiO₂＋CaO＋Fe₂O₂＋TiO₂% | ≤2.0 |
Physical Property
| PHYSICAL PROPERTY | TYPICAL VALUE |
| Bulk density (dense part) g/cm³ | 3.4 |
| Normal temperature compression resistance MPa | 240 |
| Anti-molten glass erosion speed (mm/24h) | 0.2 |
| CALCULATE SPECIFIC GRAVITY | TYPICAL VALUE |
| PT g/cm³ | 3.1 |
| WS g/cm³ | 3.3 |
Frequently Asked Questions
What are the main components of RTK-M fused alumina blocks?
RTK-M is composed of approximately 50% α-alumina and 50% β-alumina. This interlocking crystal structure creates a dense material with high resistance to alkalis.
How does RTK-M prevent contamination in molten glass?
Because it uses high-purity raw materials and contains almost no matrix glass phase or impurities like Fe₂O₃ and TiO₂, it minimizes bubbles and foreign matter when in contact with glass.
What is the maximum recommended temperature for RTK-M erosion resistance?
RTK-M shows erosion resistance comparable to AZS blocks in temperature ranges below 1350℃, making it ideal for specific glass furnace zones.
Where is RTK-M typically applied in glass furnaces?
It is most commonly used for working pool walls, pavements, material channels, and channels in high-grade glass manufacturing.
What is the typical Al₂O₃ content in these fused cast products?
The typical Al₂O₃ content is approximately 94.0%, ensuring the high purity required for high-performance refractory applications.
How are these alumina products manufactured?
They are manufactured by melting high-purity alumina in an electric arc furnace at temperatures exceeding 2000℃, followed by a specialized casting process.