White Fused Alumina Powder for Wear-Resistant Coatings
1. Product Overview
White fused alumina powder is a high-purity synthetic abrasive and functional filler, produced by the high-temperature smelting and purification of bauxite in an electric arc furnace. It is a core raw material for wear-resistant coatings, widely used in thermal spraying, brush coating, spray coating and other coating processes to enhance the surface performance of metal, ceramic and composite substrates.
2. Core Physical & Chemical Properties
表格
| Item | Standard Value | Performance Advantage |
|---|---|---|
| Aluminum Oxide Content (Al₂O₃) | ≥99.0% | High purity, ensures coating stability and wear resistance |
| Mohs Hardness | 9.0 | Excellent abrasion resistance, far higher than ordinary quartz powder |
| Particle Size Range | Customizable (e.g., 100-325 mesh, nano-scale) | Matches different coating processes and application scenarios |
| Bulk Density | 1.0-1.5 g/cm³ | Good dispersion in coating systems, no agglomeration |
| Chemical Stability | Resistant to acid, alkali and high temperature | Suitable for harsh working environments (high temperature, corrosion) |
| Loss on Ignition | ≤0.1% | Low impurity, avoids coating foaming and defects |
3. Key Advantages for Wear-Resistant Coatings
- Superior Wear Resistance: The high hardness and high toughness of white fused alumina powder effectively resist abrasive wear, adhesive wear and impact wear, extending the service life of coated components.
- Excellent Compatibility: It can be evenly mixed with organic binders (epoxy, polyurethane) and inorganic binders (ceramic, silicate), adapting to various coating formulas.
- Dense Coating Structure: Uniform particle size ensures tight packing, forming a compact coating film with low porosity, which isolates the substrate from external corrosive media.
- Thermal Stability: With a high melting point (≈2050℃), the powder maintains structural stability at high temperatures, making it suitable for high-temperature wear-resistant coatings.
- Cost-Effective: Compared with other high-hardness abrasives (such as cubic boron nitride), it has a reasonable price and excellent performance, meeting the needs of large-scale industrial production.
4. Application Scope
- Mechanical Manufacturing: Wear-resistant coatings for gears, shafts, bearings, guide rails and other mechanical parts;
- Industrial Equipment: Conveyor belts, hoppers, pipes and mining machinery components to prevent wear and corrosion;
- Automotive & Aerospace: Coating treatment of engine parts, brake components and high-wear structural parts;
- Construction & Hardware: Anti-wear coatings for metal furniture, building hardware and floor protection layers;
- Thermal Spraying: Raw material for plasma spraying, flame spraying of wear-resistant ceramic coatings.
5. Application Parameters & Operation Tips
- Coating Processes: Suitable for dry mixing, wet mixing, thermal spraying, electrostatic spraying and other processes;
- Mixing Ratio: Adjust the addition amount (10%-70% by weight) according to the wear resistance requirements of the coating;
- Dispersion Requirement: Add dispersants during mixing to avoid agglomeration of white fused alumina powder, ensuring uniform distribution in the coating;
- Post-Treatment: After coating, cure at room temperature or high temperature according to the binder type to improve the bonding strength between the coating and the substrate.