Introduction
Introduction
Alumina bubble brick is a lightweight refractory material primarily composed of alumina (Al₂O₃, typically ≥75%). It is sintered at high temperatures using hollow spherical particles with closed internal pores. Its microstructure features a hollow-sphere skeleton interspersed with pores, resulting in a porosity of 60%–80%, which gives it both high strength and low thermal conductivity.
Main Applications
Metallurgical Industry: Used in ladle covers, heating furnace linings, and thermal insulation layers for high-temperature kilns.
Ceramics & Glass Industry: Applied in high-temperature sections of tunnel kilns and for roof insulation in glass melting furnaces to reduce heat loss.
Chemical & Energy Industry: Used in linings of cracking furnaces, thermal insulation layers for high-temperature reactors, and insulation components in aerospace applications.
Advantage
Dual Advantages of Thermal Insulation & High-Temperature Resistance:Maintains stable thermal insulation performance at ultra-high temperatures, surpassing ordinary lightweight refractories.
Erosion Resistance:Demonstrates excellent resistance to acidic/neutral slags and high-temperature gases, thereby extending equipment service life.
Construction Convenience:Can be processed into standard bricks, shaped bricks, or precast components as needed, making it adaptable to complex furnace structures.
Zinfon Refractory Technology Co.,Ltd.
We provide one-stop services from technical consultation to design, production, and after-sales support.
Raw Materials
High-Purity Alumina Bubble
Chemical Composition: Al₂O₃ content ≥99%; impurities (SiO₂, Fe₂O₃) ≤0.5%, ensuring a refractoriness of ≥1,750°C.
Physical Properties: Hollow spheres with particle sizes ranging from 0.5–5 mm and closed internal pores (porosity 70%–85%).
Density: 0.3–0.8 g/cm³
Thermal Conductivity: 0.1–0.2 W/(m·K) at 1,000°C
Physical and Chemical Specifications
|
Item |
Specification |
||
|
LQZ99-1.4 |
LQZ99-1.6 |
LQZ99-1.8 |
|
|
Al2O3 % |
≥99 |
||
|
SiO2 % |
≤0.3 |
||
|
Fe2O3 % |
≤0.2 |
||
|
Bulk Density, g/cm3 |
1.3~1.5 |
1.5~1.7 |
1.7~1.9 |
|
CCS, MPa |
≥6 |
≥10 |
≥12 |
|
Thermal Conductivity, W/(m·K) Hot Side 1000℃ |
≤0.9 |
≤1.1 |
≤1.2 |
|
PLC, % 1600℃×3h |
±0.3 |
||
|
Item |
Specification |
||
|
LQZ95-1.4 |
LQZ95-1.6 |
LQZ95-1.8 |
|
|
Al2O3 % |
≥95 |
||
|
Fe2O3 % |
≤0.2 |
||
|
Bulk Density, g/cm3 |
1.3~1.5 |
1.5~1.7 |
1.7~1.9 |
|
CCS, MPa |
≥8 |
≥12 |
≥16 |
|
Thermal Conductivity, W/(m·K) Hot Side 1000℃ |
≤0.9 |
≤1.1 |
≤1.2 |
|
PLC, % 1600℃×3h |
±0.3 |
||
|
Item |
Specification |
||
|
LQZ90-1.4 |
LQZ90-1.6 |
LQZ90-1.8 |
|
|
Al2O3 % |
≥90 |
||
|
Fe2O3 % |
≤0.2 |
||
|
Bulk Density, g/cm3 |
1.3~1.5 |
1.5~1.7 |
1.7~1.9 |
|
CCS, MPa |
≥10 |
≥14 |
≥18 |
|
Thermal Conductivity, W/(m·K) Hot Side 1000℃ |
≤0.9 |
≤1.1 |
≤1.2 |
|
PLC, % 1600℃×3h |
±0.3 |
||
Process
Raw Material Pretreatment (Bubble Classification, Binder Preparation)
→ Batching & Mixing (Dry + Wet Mixing)
→ Molding (Vibration/Isostatic Pressing)
→ Drying (Stepped Heating)
→ Sintering (1,600°C high-temperature sintering)
→ Post-Treatment (Machining/Coating)
→ Performance Testing
→ Finished Product Warehousing
Commonly Used Binder: Phosphate Binder
Types: Aluminum dihydrogen phosphate (Al(H₂PO₄)₃), magnesium phosphate (Mg(H₂PO₄)₂)
Mechanism: In sol form at room temperature, reacts with Al₂O₃ to form an AlPO₄ ceramic phase. Upon heating (300–600°C), forms a reticulated structure, increasing flexural strength to 8–12 MPa.
Advantages: Resists temperatures up to 1,600°C, resists acidic slag erosion, and performs well in oxidizing atmospheres.
Application
I. Metallurgical Applications
Use: Blast furnace linings, hot blast stoves, ladle linings, heating furnace walls and roofs
Advantages:
Withstands temperatures above 1,700°C
Resists erosion from molten iron and slag
Extends equipment life
Reduces energy consumption (e.g., raises hot blast air temperature above 1,200°C while cutting heat loss by ~30%)
II. Ceramic Industry Applications
Use: Kiln linings (shuttle/tunnel kilns), kiln furniture, insulation in refractory sintering furnaces
Advantages:
Stable at high temperatures
Chemically inert with ceramic glazes and refractories
Lightweight, reducing overall kiln weight and easing maintenance
III. Chemical Industry Applications
Use: Cracking furnace linings, ammonia synthesis furnaces, insulation in high-temperature reactors
Advantages:
Resistant to corrosive acidic/alkaline media
Ideal for coal chemical and petroleum refining environments
Excellent thermal shock resistance (withstands ≥500°C rapid heating/cooling)
IV. Power & Energy Applications
Use: High-temperature zones in coal-fired boilers, gas turbine chambers, waste incinerators
Advantages:
Resists chlorine/sulfur erosion in waste incinerators
Maintains outer wall temperatures <60°C, improving safety and efficiency
V. Aerospace & Military Applications
Use: Rocket nozzles, missile warheads, high-temp test facility linings
Advantages:
Stable above 2,000°C
Lightweight (1.0–1.8 g/cm³), reducing payload and enhancing performance
VI. Glass Industry & Laboratory Applications
Use: Superstructures of glass melting kilns, refractory fiber production, lab equipment (muffle/vacuum furnaces)
Advantages:
Protects against sodium vapor erosion
Reduces external heat conduction
Improves melting efficiency
Why chooes us?
01/Customized dimensions and shapes
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02/Delivery cycle and logistics
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Sea freight, land freight. Determine the mode of transportation according to the needs
About 30 days, customized products delivery time depends on the actual situation.
03/Customized packaging
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Customize your brand
Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials.
Take your brand to the next level, contact us today to discuss your project!
04/Purchase ZINFON refractory Bricks at Reasonable Prices
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The price of refractory bricks is a known key factor influencing customers' purchasing decisions. Therefore, we offer affordable refractory bricks for sale. Here are several reasons why ZINFON provides refractory bricks at competitive prices:
01
Factory price
02
Low raw material cost
03
Mass production
It is worth noting that while price is an important factor, it should not be the sole determinant of your purchasing decision. When buying refractory bricks from ZINFON, quality, reliability, and technical support are equally important considerations.
By choosing ZINFON as your supplier, you can access high-quality refractory bricks, a wide range of other refractory materials, and comprehensive support. Contact ZINFON Refractories immediately to discuss your specific requirements and obtain customized solutions!
7*24 hours online response
Provide professional after-sales protection
Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
+8613700131695
+8618540210631
info@zinfon-refractory.com
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