Fused Mullite Bricks

Fused cast mullite bricks are made from mullite raw materials and are produced by the fused casting method. The primary crystalline phase of fused cast mullite brick is mullite. Mullite raw material is melted at about 2300 °C and then cast in sand mold at 1850°C to make fused cast mullite bricks. Fused cast mullite bricks have better-molten glass corrosion resistance compared with sintered mullite bricks. When a small amount of zirconia (7%~8.5%) is added to the raw material, the high-temperature performance of fused cast mullite bricks can be improved.


Fused Cast Mullite Bricks Properties

Excellent thermal shock resistance can resist drastic temperature change.
Excellent abrasion resistance is suitable for high-temperature wearing parts.
Excellent permeation and chemical corrosion resistance.
Low thermal expansion rate, masonry has good structural stability.
High hot mechanical strength, can support a large load.

Fused Cast Mullite Bricks Physiochemical Indexes

Item RZMZ-1 RZMZ-2 RZMZ-3 RZMZ-4
Al2O3 % 70~75 76.17 73.5~76 73.1
SiO2 % 18~21 19.33 22~26 19
Fe2O3 % 2.5~4 1.8 0.1 0.6
TiO2 % 3.0~4.5 2.91 0.05 0.30
Refractoriness ℃ 1790 1790 1790 1790
Bulk density g/cm3 3.00~3.20 3.20 3.20 3.20
Apparent porosity % 1~3 0.5~1.0 / /
Crushing strength MPa >300 176~317 >176 ≥123

Fused Cast Mullite Bricks Application

Fused cast mullite bricks are mainly used at high-temperature parts of smelting furnaces, where suffer severe abrasion and chemical corrosion, such as sliding rail bricks of metallurgical Pusher-type heating furnace, walking-type heating furnace tapping platform (tapping spout) and garbage incinerator lining, etc.

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