Electrofused α‑β corundum refractory bricks
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Description:
Electrofused α‑β corundum refractory bricks
Main Product Types and Ingredient Characteristics
- ZM-α Type (Alpha Corundum)
- Composition: α-Al₂O₃ ≥ 90%, Na₂O ≤ 0.3%
- Features: Outstanding high-temperature stability, hardness (Mohs… 9.2 grade) Close to pure corundum
- ZM-G Type (Alpha-Beta Composite Type)
- Composition: α/β-Al₂O₃ ≈ 50:50, Na₂O 1.2–1.8%
- Characteristics: Crystalline interwoven structure, Below 1350℃, its resistance to glass corrosion rivals that of zirconia‑corundum.
- ZM-U Type (β-Alumina)
- Composition: Primarily β-Al₂O₃ (Na₂O ≥ 5%)
- Characteristics: Plate-like coarse-grained structure, resistant to strong alkalis but with relatively low strength.
Modernized production process flows
- Raw Material Processing ：
- Use calcined alumina with a purity of ≥95%, and employ Na₂CO₃ as a mineralizer (to control the formation of the β phase).
- Three-phase arc furnace melting (≥2300℃), with a carbon content of ≤0.05% using the oxidation process.
- Precision casting ：
- Conventional casting ( RC): Shrinkage cavities are located in the lower part of the gate and are used for low-temperature areas.
- Cast without shrinkage pores VF): Remove the sprue area, with residual shrinkage cavities no larger than 5 mm.
- Post‑processing ：
- Anneal at 1600℃ for 72 hours to relieve stress.
- CNC machining accuracy reaches ±0.3 mm, with pre‑assembly errors no greater than 1 mm/m.
Key Application Areas
- Glass Industry ：
- Fully enclosed work pool ( ZM-G VF bricks) to reduce glass bubbles.
- Material channel /Feeder (ZM-G type), glass contamination index ≤ 0.5 ppm
- High‑Temperature Industry ：
- Graphitization furnace lining ( ZM-α type), with a lifespan three times that of conventional materials.
- Electron Ceramic Sintering Furnace ( ZM-U type), resistant to spodumene melt
- Special Scenarios ：
- Transition section of the photovoltaic glass tin bath, thermal shock stability > 30 cycles (water cooling at 1100℃)
Characteristics
|
ZM-G Type
|
Electrofused zirconia‑alumina brick
|
Glass phase exsolution temperature
|
No exudate
|
≥1400℃ |
Thermal conductivity ( 1000℃ )
|
2.1 W/(m·K) |
3.8 W/(m·K) |
Alkali-resistant steam erosion
|
Gain weight ≤0.5% |
Gain weight 2–3% |
Service Life (Glass Furnace)
|
5–7 Year
|
7–10 Year
|
Performance Comparative Advantage
Note: In For service conditions below 1350℃, its cost performance is more than 30% better than zirconia‑alumina.
Core Physicochemical Parameters
- Basic Physical Properties: - Bulk density: 3.25–3.40 g/cm³ ( RC Type) Apparent porosity: ≤4% ( VF Machined surface)
- High-temperature performance: - Load softening temperature ( 0.2MPa ): ≥1700℃[1]()- Resistant to glass erosion ( 1350℃/72h ): ≤0.8mm Penetration
3. Special Indicators: - β Phase transformation rate: 50±5% ( ZM-G Type) [9]()- Coefficient of thermal expansion ( 20–1000°C ): 8.5×10⁻⁶/°C
Latest Technology Updates: The gradient composite product launched in 2025 (with an α-phase content of 80% in the working layer and a β-phase content of 30% in the transition layer) enhances thermal shock resistance to 45 cycles.
Keywords:
Electrofused α‑β corundum refractory bricks
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