Tabular corundum offers distinct and superior advantages in refractory brick applications, primarily rooted in its unique structure and high-performance characteristics, which outperform conventional corundum materials. Here’s a detailed breakdown:
1. Exceptional High-Temperature Stability
- Boasts an ultra-high melting point (≈2050°C) and maintains structural integrity without softening, decomposition, or obvious deformation even at temperatures exceeding 1800°C.
- Exhibits low and uniform high-temperature volume expansion, effectively preventing refractory bricks from cracking due to thermal expansion and contraction during furnace heating and cooling cycles.
2. Superior Corrosion and Penetration Resistance
- Features ultra-high purity (Al₂O₃ ≥99%) with minimal impurities, enabling it to resist chemical erosion from molten metals, slags, and acid-alkaline media, thus reducing brick wear and dissolution.
- Has a dense plate-like crystal structure with tight particle packing, forming a barrier against the penetration of high-temperature melts into the brick interior. This avoids the formation of eroded layers that cause brick spalling.
3. Excellent Thermal Shock Resistance
- The plate-like crystal structure provides good elasticity and stress buffering capacity, relieving internal stresses caused by frequent thermal shocks (rapid temperature changes).
- Compared to traditional corundum, it suffers less strength loss after thermal shock cycles, significantly lowering the risk of refractory brick spalling or fracture due to sudden temperature fluctuations and extending service life.
4. Outstanding Mechanical Strength
- Delivers superior compressive strength and wear resistance at both room and high temperatures, withstanding mechanical impacts and material abrasion during furnace operation.
- Refractory bricks made with tabular corundum have high density and low porosity, resulting in a more robust structure that is less prone to damage from external forces.
5. Cost-Efficiency via Extended Service Life
- Refractory bricks incorporating tabular corundum have a service life 30%–100% longer than those made with traditional corundum in harsh working conditions.
- Reduces furnace downtime for maintenance and brick replacement, cutting indirect losses from production halts and lowering overall operational costs.
