Sintered Mullite Brick is a high-performance refractory materials with mullite (3Al₂O₃·2SiO₂) as the primary crystalline phase. They are widely used in high-temperature industrial furnaces, such as glass kilns, ceramic kilns, and steel smelting furnaces. It belong to High-Alumina Refractories.
Production Process of Sintered Mullite Bricks
Raw Material Preparation
The main raw materials typically include high-alumina bauxite clinker, industrial alumina, and silica. Sometimes, a small amount of clay or raw bauxite is added as a binder. These raw materials need to be precisely proportioned and thoroughly dried to prevent air bubbles or cracks during subsequent forming and sintering.
Batching and Mixing
Different particle sizes of aggregates (such as high-temperature calcined bauxite and mullite) are mixed with fine powders (such as bauxite, clay, and fine mullite powder) according to specific ratios. Sometimes, organic binders like pulp or spent sulfite liquor are added to improve the plasticity of the mixture.
Forming
The uniformly mixed materials are formed into brick blanks through pressing or extrusion. The formed blanks have a certain density and strength.
Drying
The formed brick blanks must be thoroughly dried to ensure their moisture content meets requirements (e.g., moisture content ≤2%), preventing cracking during the sintering process.
Sintering
The dried brick blanks are sintered in tunnel kiln. Sintering temperatures is 1500 oC -1700 oC or even higher, with sintering times generally between 10 and 15 hours.
Cooling and Inspection
The sintered bricks need to be cooled slowly, then subjected to quality inspections, including dimensions, density, strength, and refractoriness.
Technical Specifications of Mullite Brick
|
Item |
Sintered mullite brick |
|
|
SM-70 |
SM-75 |
|
|
Al2O3, ≥% |
70 |
75 |
|
Fe2O3, ≤% |
1.2 |
0.8 |
|
Bulk Density, ≥g/cm³ |
2.5 |
2.6 |
|
Apparent Porosity ,≤% |
18 |
17 |
|
Cold Crushing strength, ≥Mpa |
70 |
80 |
|
0.2Mpa Refractoriness under load, ≥℃ |
1600 |
1650 |
|
Thermal shock resistance(1100℃water-cooling)Times, ≥ |
15 |
15 |
Key Characteristics of Sintered Mullite Brick
High Refractoriness
Sintered mullite bricks typically have a refractoriness exceeding 1790oC, allowing them to operate stably in extremely high-temperature environments.
01
High High-Temperature Structural Strength
Even at high temperatures, sintered mullite bricks maintain high strength. Their refractoriness under load usually starts between 1600oC and 1700 oC, and their room-temperature compressive strength can range from 70 to 260MPa.
02
Excellent Thermal Shock Stability
The mullite crystal structure has a low and uniform thermal expansion coefficient, giving sintered mullite bricks good thermal shock resistance. They can withstand drastic temperature changes without cracking.
03
Low High-Temperature Creep Rate
During long-term use at high temperatures, the material exhibits minimal deformation, maintaining structural stability.
04
Strong Acid Erosion Resistance
Sintered mullite bricks have good resistance to acidic slag and molten materials, but they are generally not suitable for prolonged use in oxidizing atmospheres.
05
Low Thermal Expansion Coefficient and High Thermal Conductivity
These properties contribute to their dimensional stability and good heat transfer performance in high-temperature environments.
06
Low Impurity Content
High-purity sintered mullite bricks usually contain very low levels of iron, alkali metal, and other oxide impurities, which further enhances their refractoriness and performance in reducing atmospheres.
07
Main Applications
Due to their excellent high-temperature performance, sintered mullite bricks are widely used in various high-temperature industrial kilns and equipment:
1.Iron and Steel Industry:
1).Hot blast stove roofs, bodies, and bottoms: Their high-temperature performance and creep resistance make them an ideal choice.
2).Large blast furnace hearths and lower stacks: Withstand high temperatures and molten iron erosion.
3).Steelmaking furnace covers and electric furnaces: Resist high-temperature flue gas and slag erosion.
4).Torpedo ladles and reheating furnaces: Used as lining materials.
2.Glass Industry:Glass melting furnace regenerators: Excellent resistance to alkali vapor corrosion and creep.
3.Ceramic Industry:Ceramic firing kiln linings and kiln furniture: Withstand high temperatures and thermal shock.
4.Petrochemical Industry: Linings for petroleum cracking furnaces, hydrogen production furnaces, and conversion furnaces: High-temperature and chemical corrosion resistance.
5.Cement kilns, waste incinerators: Handle high-temperature and corrosive environments.
6.Linings and insulation layers for various high-temperature industrial furnaces: Provide efficient thermal insulation and heat retention.
Packaging and Shipping of Sintered Mullite Brick
1.Packed on wooden pallets with moisture-proof film to prevent damage.
2.Wooden box
3.Keep in dry, ventilated areas.
Our Company
Why Choose Us?
We are a modern integrated enterprise specializing in refractory materials, combining R&D, production, design, construction and technical services. Our business covers development, manufacturing and sales of refractory materials and insulation material
Our engineers will recommend right bricks for you based on:
Operating temperature → Determines Al₂O₃ content
Chemical environment → Corrosion resistance grade
Mechanical load → Density & strength requirements
Free samples to be provided.
Within in 8 hours to respond your inquiry.
If you receive defective products,We guarantee:24-hour response,Solution within 48 hours and Replacement/refund options.
Our company supplies a complete range and type of Refractory materials, including:
Standard to high-grade products (Al2O3: 48%-90%)
Special-function types (spalling-resistant, low-creep, microporous, etc.)
Custom-engineered solutions for specific applications
Hot Tags: sintered mullite brick, China sintered mullite brick manufacturers, suppliers, factory, Fused Mullite Brick, High purity Mullite Brick, mullite brick, Mullite Fire Brick, Mullite Refractory Brick, Sintered Mullite Brick
