Burning Nozzle Mullite Castable is developed using composite bonding technology with high-quality mullite aggregates as the primary raw material, combined with corundum, silicon carbide, micro-powders, and specialized additives.
Key Performance Characteristics
●By integrating the advantages of both mullite and corundum systems, this castable offers:
●High refractoriness and excellent high-temperature strength
●Superior resistance to high-velocity airflow erosion
●Outstanding thermal shock resistance and anti-spalling performance
●High refractoriness under load (RUL)
●Low high-temperature creep rate
●Strong chemical corrosion resistance
Typical Applications
●Burner nozzles in aluminum melting furnaces
●Burner linings
●Other high-temperature flame-impingement components
Mullite castables used for burner nozzles in aluminum melting furnaces must withstand temperatures of 1400–1500 °C. In addition to high refractoriness and excellent thermal shock resistance, the burner blocks must also exhibit strong resistance to high-velocity hot gas erosion and dust-laden atmospheres. Therefore, high-grade bauxite clinker and aluminosilicate minerals (such as sillimanite, kyanite, and andalusite) with superior refractory properties are selected as the primary raw materials. Reactive α-Al₂O₃ micropowder and silica fume are used as binders, and appropriate additives are incorporated to improve workability.
|
Project |
HX-HM55 |
|
|
Al2O3 |
55 |
|
|
Bulk Density (g/cm3) |
2.3 |
|
|
Flexural Strength (MPa) |
110°C x16h |
8 |
|
1300°C x3h |
10 |
|
|
Compressive Strength (MPa) |
110°C x16h |
60 |
|
1300°C x3h |
75 |
|
|
Linear Rate of Change (%) |
110°C x16h |
-0.1 |
|
1300°C x3h |
-0.3 |
|
|
Operating Temperature(℃) |
1400 |
|
The castable is characterized by:
●high refractoriness
●resistance to high-velocity gas erosion
●high-temperature strength
●thermal shock resistance
●spalling resistance
●high load softening temperature
●low high-temperature creep rate
●chemical corrosion resistance
● Premium high-purity mullite aggregates engineered specifically for burner applications
● Designed to withstand extreme combustion-zone environments
● Minimizes burner failures while reducing downtime and maintenance costs
● Proven reliability across heating furnaces, heat-treatment furnaces, and industrial combustion systems
The mullite castable for burner nozzles is primarily used in:
● Industrial furnace burners and burner linings
● Combustion zones of heating and heat-treatment furnaces
● Firing zones of rotary and tunnel kilns
● Gas-fired, oil-fired, and dual-fuel combustion systems
● Other high-temperature areas exposed to direct flame impingement
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