High-Temperature Resistant Alumina Al2O3 Ceramic Solid Blocks, Bricks, and Plates

(High Temperature Resistant Alumina Al2o3 Ceramic Solid Block Brick Plate)

1. Why High Temperature Resistant Alumina Al2O3 Ceramic Solid Block Brick Plate Has Good Characteristics

1.1 Inherent Material Properties

High temperature resistant alumina ceramics derive their exceptional characteristics from alpha-phase aluminum oxide crystalline structures formed at extreme temperatures. This molecular arrangement creates:

• Unmatched thermal stability (up to 1750°C)
• Low thermal expansion coefficient (8.1×10^-6/K)
• Exceptional hardness (9 on Mohs scale)
• Chemical inertness against acids and molten metals

The high-purity Al2O3 composition (≥99%) minimizes glassy phases that compromise structural integrity at elevated temperatures.

1.2 Structural Advantages

Dense sintering creates near-zero porosity (≥3.9 g/cm³ density), preventing gas permeation and thermal stress cracking. The equiaxed grain microstructure distributes mechanical loads evenly, while engineered geometries minimize thermal shock through controlled heat dissipation. These characteristics make alumina blocks indispensable for extreme environments.

2. What Is High Temperature Resistant Alumina Al2O3 Ceramic Solid Block Brick Plate

2.1 Technical Definition

These are monolithic ceramic components manufactured from ≥99% pure aluminum oxide through high-temperature sintering. Available as solid blocks, bricks, or plates, they maintain structural integrity above 1600°C while exhibiting:

• Dielectric strength: ≥10 kV/mm
• Compressive strength: ≥2200 MPa
• Thermal conductivity: 30 W/mK
• Surface roughness: Ra 0.2μm (precision grades)

Unlike refractory bricks, alumina ceramic blocks offer non-porous surfaces that resist slag penetration and chemical erosion.

2.2 Physical Forms

Standard configurations include isostatically pressed blocks (50x50mm to 300x300mm), extruded bricks with interlocking features, and precision-lapped plates (1-50mm thickness). Custom geometries like arches, nozzles, and crucibles are engineered for specific thermal systems, with dimensional tolerances within ±0.5%.

3. How High Temperature Resistant Alumina Al2O3 Ceramic Solid Block Brick Plate Was Produced

3.1 Advanced Manufacturing Process

Production begins with micron-sized alumina powder (0.1-1μm particles) blended with sintering aids. The process involves:

1. Dry pressing/isostatic forming at 100-200 MPa
2. Bisque firing (1100°C) to remove binders
3. High-temperature sintering (1600-1800°C)
4. Precision diamond grinding to ±0.01mm tolerances

For complex geometries, special-shaped components undergo injection molding or CNC green machining before sintering.

3.2 Quality Control Measures

Every production batch undergoes ultrasonic flaw detection, XRD phase analysis, and thermal cycling tests. Density verification via Archimedes’ method ensures porosity <0.5%, while coordinate measuring machines validate dimensional compliance. Post-sintering treatments like precision lapping achieve optical-grade surface finishes when required.

4. What Are The Application Fields of High Temperature Resistant Alumina Al2O3 Ceramic Solid Block Brick Plate

4.1 Industrial Thermal Systems

Alumina ceramic blocks serve as critical components in:

• Furnace linings and burner nozzles (1600°C+ environments)
• Glass tank superstructures resisting molten glass corrosion
• Metal processing: continuous casting nozzles and tundish liners
• Kiln furniture: saggers and setters for technical ceramics

Their thermal shock resistance enables rapid cycling in regenerative burners and heat treatment fixtures.

4.2 Advanced Technology Applications

Beyond traditional industries, these ceramics enable:

• Semiconductor wafer processing components
• Plasma containment rings in etching systems
• Insulating substrates for high-power electronics
• Laser cavity components requiring thermal stability

The dielectric properties combined with thermal conductivity make them ideal for RF-transparent thermal management systems.

5. How To Choose A Good High Temperature Resistant Alumina Al2O3 Ceramic Solid Block Brick Plate

5.1 Material Specification Criteria

Select components based on:

• Alumina content: 99% for <1800°C, 99.7% for extreme purity
• Density: ≥3.92 g/cm³ indicates low porosity
• Grain size: <2μm for optimal mechanical strength
• Thermal expansion match: CTE compatibility with adjacent materials

For corrosive environments, verify acid/alkali resistance data per ASTM C863 standards.

5.2 Design and Certification Factors

Prioritize manufacturers offering:

• Non-destructive testing reports (X-ray, ultrasound)
• Thermal cycling validation certificates
• Custom special-shape engineering capabilities
• Precision-ground surfaces (Ra ≤0.4μm) for sealing applications

For critical installations, request creep resistance data at operational temperatures.

6. What Does People Also Ask About High Temperature Resistant Alumina Al2O3 Ceramic Solid Block Brick Plate

6.1 Performance Limitations

Common technical queries address:

• Maximum service temperature: 1750°C in oxidizing atmospheres
• Thermal shock resistance: ΔT ≥300°C (water quench test)
• Load capacity at temperature: 150 MPa at 1400°C
• Chemical limitations: HF acid and strong alkalis attack alumina

6.2 Installation and Maintenance

Frequent operational questions include:

• Joining techniques: Special ceramic adhesives or mechanical clamping
• Thermal cycling protocols: Recommended ≤5°C/minute ramp rates
• Surface regeneration: Diamond polishing restores sealing surfaces
• Failure analysis: Thermal stress patterns versus mechanical damage identification

For specialized applications, precision-finished components with laser-marked identification ensure traceability.

Tags: alumina ceramic block, Al2O3 brick, high temperature ceramic plate, alumina refractory, 99% alumina ceramic, ceramic kiln furniture, industrial ceramic components, alumina insulation

(High Temperature Resistant Alumina Al2o3 Ceramic Solid Block Brick Plate)

Supplier
Alumina Technology Co., Ltd focus on the research and development, production and sales of aluminum oxide powder, aluminum oxide products, aluminum oxide crucible, etc., serving the electronics, ceramics, chemical and other industries. Since its establishment in 2005, the company has been committed to providing customers with the best products and services.