Ceramic

Calcined Alumina

Microns Calcined Alumina is a high-purity material widely used in ceramics for its excellent hardness, strength, and thermal stability. It enhances mechanical strength, wear resistance, and high-temperature performance in advanced and technical ceramics. Commo

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Calcined Alumina
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Advantages

Key Benefits

Why Calcined Alumina is the preferred choice for ceramic formulations

01

Exceptional Hardness (Mohs 9)

02

High-Temperature Mechanical Strength

03

Excellent Wear & Abrasion Resistance

Calcined Alumina benefits Performance engineered for Ceramic
04

High Thermal Stability & Refractoriness

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High Chemical Purity (>99% Al₂O₃)

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Excellent Electrical Insulation Properties

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Product Grades

Product Grades

Comprehensive range of Calcined Alumina grades for diverse industrial applications

1 Specialized Grades

Each grade is engineered for specific performance requirements in ceramic applications

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MICRONS ALUMINA

High-purity calcined alumina (>99% Al₂O₃) for advanced technical and electrical ceramic applications. Provides exceptional hardness, wear resistance, high-temperature mechanical strength, and excellent electrical insulation properties for demanding engineering ceramic requirements.

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Insulator Industrial Grade Quality Tested
Ceramic Application Matrix

Application Areas

Application areas listed against Calcined Alumina in the Ceramic application matrix

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Insulator — Specialty
Use Area 01

Insulator — Specialty

Role / FunctionHardness, Wear & Thermal Resistance

Key Grades—

Verified in Ceramic matrix
Product Sheet Applications

Applications

Applications listed for Calcined Alumina in the Ceramic product sheet

Electrical Insulator Body
01

Electrical Insulator Body

Calcined Alumina
Refractory Products
02

Refractory Products

Calcined Alumina
Advanced Technical Ceramics
03

Advanced Technical Ceramics

Calcined Alumina
Wear-Resistant Ceramic Components
04

Wear-Resistant Ceramic Components

Calcined Alumina
High-Purity Ceramic Bodies
05

High-Purity Ceramic Bodies

Calcined Alumina
Specialty Ceramic Composites
06

Specialty Ceramic Composites

Calcined Alumina

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Frequently Asked Questions

Common questions about Calcined Alumina in ceramic applications

Calcined alumina is produced by the thermal treatment of aluminium hydroxide (gibbsite) at high temperatures (1000–1200°C), converting it to the stable alpha-alumina (α-Al₂O₃) phase. The calcination temperature controls the crystal size, surface area, and sintering reactivity of the alumina for specific ceramic applications.

Calcined alumina provides the highest hardness (Mohs 9), exceptional wear resistance, high-temperature mechanical strength, excellent chemical inertness, and good electrical insulation properties. These properties are essential for technical ceramic components operating in high-temperature, high-wear, or electrically demanding environments.

Calcined alumina is used in high-voltage electrical insulators, refractory bricks and kiln furniture, wear-resistant ceramic components (grinding media, liners), spark plugs, cutting tools, electronic substrates, and advanced technical ceramics where other materials lack the required hardness and thermal stability.

Higher purity (>99% Al₂O₃) alumina produces ceramics with better mechanical strength, higher dielectric performance, lower porosity, and more consistent sintering behaviour. Lower-purity grades contain more impurities (SiO₂, Fe₂O₃) that can form secondary glass phases, reducing high-temperature mechanical performance.

High-purity alpha-alumina ceramics typically require sintering temperatures of 1550–1700°C to achieve full densification (>99% theoretical density). Sintering aids such as MgO (0.1–0.5%) are added to promote grain boundary mobility and densification at lower temperatures.

Calcined alumina is produced by thermal treatment of aluminium hydroxide and is used primarily in sintered ceramic bodies. Fused alumina is produced by electric arc melting and is used primarily as an abrasive and refractory aggregate. Calcined alumina has higher chemical purity and more controlled sintering reactivity for technical ceramic applications.

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