What is white fused alumina?

White Fused Alumina (WFA), also known as white corundum, is a high-purity synthetic material made from aluminum oxide (Al₂O₃). Due to its extreme hardness, thermal stability, and chemical resistance, WFA is widely used in abrasives, refractories, polishing, and high-performance coatings.

What is White Fused Alumina?

White Fused Alumina is produced by melting calcined alumina in an electric arc furnace at temperatures exceeding 2000°C. The resulting material is crushed, milled, and classified into different particle sizes, making it suitable for various industrial applications.

Key Characteristics:

• High Purity: Typically ≥99.5% Al₂O₃
• Superior Hardness: Mohs hardness of 9
• Excellent Wear and Abrasion Resistance
• High Melting Point: ~2000°C
• Chemical Inertness: Resistant to acids and alkalis
• High Thermal Stability: Performs well under extreme temperatures

Manufacturing Process of White Fused Alumina

The production of White Fused Alumina involves several key steps:

1. Raw Material Selection: High-purity calcined alumina is chosen as the base material.
2. Fusion Process: The alumina is melted in an electric arc furnace at over 2000°C.
3. Cooling and Solidification: The molten material is cooled and crystallized into solid blocks.
4. Crushing and Milling: The solidified alumina is broken down into various grit sizes.
5. Screening and Classification: The particles are sorted into specific grain sizes for different applications.

Applications of White Fused Alumina

Due to its unique properties, White Fused Alumina is widely used in various industries:

Abrasives Industry

WFA is a preferred material for grinding wheels, sandblasting, coated abrasives, and polishing compounds, offering superior cutting efficiency and durability.

Refractories

Used in high-temperature refractories, WFA enhances the strength and thermal resistance of kiln linings, furnace bricks, and castables.

Surface Preparation & Polishing

WFA is used for precision polishing, optical lens grinding, and metal surface finishing, ensuring a high-quality finish.

Ceramic Coatings & Thermal Sprays

WFA enhances the durability and heat resistance of ceramic coatings, plasma sprays, and corrosion-resistant coatings.

Advantages of White Fused Alumina

• High Hardness: Provides excellent cutting and grinding efficiency.
• Low Iron Content: Ensures minimal contamination in sensitive applications.
• Excellent Heat Resistance: Ideal for high-temperature environments.
• Eco-Friendly: Free from hazardous impurities and recyclable.
• Consistent Performance: Engineered for high precision and durability.

Conclusion

White Fused Alumina is a high-performance material widely used in abrasives, refractories, and high-tech coatings. Its superior hardness, purity, and thermal stability make it indispensable in industries requiring precision and durability.

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FAQs

What is the difference between White Fused Alumina and Brown Fused Alumina?

White Fused Alumina has a higher purity (≥99.5% Al₂O₃) and superior hardness, making it ideal for precision abrasives and high-tech applications. Brown Fused Alumina contains more impurities and is used for general-purpose abrasives and industrial applications.

Can White Fused Alumina be used in the electronics industry?

Yes, due to its high purity and low contamination, WFA is used in semiconductor polishing, electronic coatings, and insulating ceramics.

Is White Fused Alumina environmentally friendly?

Yes, WFA is a non-toxic and recyclable material, making it a sustainable choice for industrial applications.

What industries use White Fused Alumina?

Industries including abrasives, refractories, aerospace, electronics, automotive, and thermal spraying utilize WFA for high-performance applications.