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Zirconia Alumina (ZA) is a high-performance fused oxide material composed mainly of aluminum oxide (Al₂O₃) and zirconium oxide (ZrO₂). It is produced by melting high-purity alumina and zirconia in an electric arc furnace, followed by controlled cooling to form a tough, microcrystalline structure.

ZA40 and ZA25 refer to zirconia alumina grades containing approximately 40% ZrO₂ and 25% ZrO₂ respectively. These materials are well known for their exceptional toughness, high fracture resistance, and superior wear performance, making them ideal for demanding abrasive and refractory applications.
Key Properties of Zirconia Alumina (ZA40 / ZA25)
Exceptional Toughness

Zirconia alumina exhibits outstanding toughness due to its microcrystalline structure and transformation toughening mechanism. This allows it to resist crack propagation and mechanical failure under heavy stress.

High Wear and Impact Resistance

Compared with conventional alumina abrasives, ZA40 and ZA25 offer significantly improved wear resistance and impact strength, ensuring longer service life in high-load grinding and cutting applications.

High Temperature Stability

Zirconia alumina maintains structural integrity and performance at elevated temperatures, making it suitable for high-temperature industrial environments.

Strong Bonding Compatibility

ZA40 and ZA25 show excellent compatibility with resin, vitrified, and rubber bonding systems, providing flexibility in abrasive product manufacturing.
Applications of Zirconia Alumina (ZA40 / ZA25)

Thanks to its superior mechanical properties, zirconia alumina is widely used in the following industries:

Abrasive Industry

Grinding wheels: Heavy-duty grinding of steel and stainless steel

Cut-off wheels: High-efficiency cutting with extended service life

Abrasive belts and discs: Ideal for high-pressure and high-speed grinding

Metallurgy & Foundry

Surface conditioning: Removal of scale and weld seams

Heavy metal fabrication: Grinding and finishing of hard alloys

Refractory Applications

Wear-resistant linings: Suitable for high-abrasion refractory components

High-performance refractories: Used in areas requiring toughness and thermal stability

Industrial Manufacturing

Shot blasting media: Long-lasting abrasive performance

Precision grinding: Consistent cutting action under demanding conditions
Installation and Handling

Zirconia alumina is typically supplied in granular or grit form. During handling and processing:

Store in dry conditions to prevent moisture absorption

Avoid contamination to maintain chemical composition consistency

Use appropriate protective equipment during abrasive processing

Maintenance and Storage

Zirconia alumina requires minimal maintenance. Proper storage in sealed, moisture-free environments ensures stable performance and long shelf life.
Conclusion

Zirconia alumina ZA40 and ZA25 are premium industrial materials offering superior toughness, wear resistance, and thermal stability. Their outstanding performance makes them ideal for heavy-duty abrasive, metallurgical, and refractory applications. Selecting the appropriate ZA grade ensures improved productivity, longer tool life, and reduced operating costs.

Frequently Asked Questions About Zirconia Alumina (ZA40 / ZA25)
1. What is the difference between ZA40 and ZA25?

ZA40 contains approximately 40% zirconia, offering higher toughness and impact resistance, while ZA25 contains around 25% zirconia, providing a balance between performance and cost.

2. Is zirconia alumina better than brown fused alumina?

Yes. Zirconia alumina offers significantly higher toughness and wear resistance than brown fused alumina, especially in heavy-duty grinding applications.

3. Can zirconia alumina be used at high temperatures?

Yes. ZA40 and ZA25 maintain stable performance in high-temperature industrial environments.