Main characteristics
Lightweight and high strength: Low volume density (usually 0.8~1.5 g/cm³), only 1/3~1/2 of traditional refractory bricks, but compressive strength can reach 5~20 MPa, with both lightweight and mechanical stability.
Excellent thermal insulation performance: The hollow ball structure effectively blocks heat conduction, with low thermal conductivity (0.3~0.8 W/(m·K)), suitable for high-temperature insulation scenes to reduce heat loss.
High temperature resistance: The purity of alumina is as high as 90%~99%, the refractoriness is ≥1750℃, and the long-term use temperature can reach 1600~1800℃ (depending on the purity).
Chemical stability: Resistant to acid and alkali erosion, reducing atmosphere and slag penetration, suitable for corrosive environments.
Low heat capacity and thermal shock stability: Small heat capacity, energy saving when heating up; the pore structure buffers thermal stress, and the thermal shock resistance is better than that of dense bricks.
Application fields
High-temperature industrial furnace linings: Petrochemical cracking furnaces, metallurgical heating furnaces, ceramic sintering kilns, etc., reduce furnace load and save energy.
Aerospace: Aircraft insulation components, rocket nozzle linings, resistant to extremely high temperatures and thermal shock.
Electronics and new energy: Polysilicon ingot furnaces, lithium battery sintering kilns, to ensure high-purity environment.
Laboratory equipment: Muffle furnaces, tubular furnace linings, precise temperature control.
Special glass industry: Glass melting furnace hot surface insulation layer, resists alkali vapor erosion.
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