High-Alumina Brick LZ-65
High-alumina brick LZ-65 (Al₂O₃≥65%, refractoriness ≥1790℃) has a higher corundum/mullite phase ratio for stronger slag resistance, higher temperature rating and better hot load-bearing capacity.
Learn More →Tunnel Kiln Car Lining Erosion
Tunnel Kiln · Burning Zone
Problem Details
Background
The kiln-car lining of a tunnel kiln cycles through preheat, firing and cooling zones, long-term bearing high temperature (1200–1400℃ in the firing zone), product load and temperature cycling. Car-lining erosion and cracking in the firing zone are high-frequency issues, affecting car life and product quality.
Failure Mechanism
High temperature and thermal shock: cars cycle through zones; lining bricks bear high temperature and heating/cooling cycles, with thermal-shock stress cracking them. Product load: products and setters impose mechanical load and collision on car bricks. Melting attack: products (ceramic glaze, glass) melt at high temperature and attack the bricks. Wear: car movement vibration and friction wear the bricks.
Consequences
After erosion and cracking, car insulation degrades and cars deform, hurting product quality and car life; fallen bricks may jam cars or damage kiln structure, forcing shutdown for repair.
Solution
Material Selection and Parameters
Select firing-zone car bricks for "high thermal-shock resistance + temperature resistance":
- Material system: high-alumina brick (Al₂O₃≥55%) or mullite brick (Al₂O₃≥75%). High-alumina offers value; mullite resists high temperature and thermal shock for hot firing-zone cars;
- Structural design: reliably connect car bricks with the steel structure; insulation reduces heat to the frame; standard shapes for easy replacement;
- Joint materials: lay with high-alumina mortar and tight joints.
Installation Essentials
Masonry control: lay car bricks with staggered joints, full mortar and joints ≤2mm. Locking: lock bricks against loosening in transport. Bake-out: bake new or repaired cars per the curve to avoid residual moisture.
Maintenance
Standardize loading and car operation to reduce collision; inspect car bricks regularly and patch/replace eroded or cracked bricks promptly. At maintenance, assess overall car condition and record car-life data to optimize grade and structure.
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Low-Creep High-Alumina Brick
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