Introduction to Corundum in Brake Linings Formulas
Corundum (α-Al₂O₃), a high-hardness alumina-based material, is widely utilized in brake linings mixtures due to its exceptional thermal stability and abrasive properties. It enhances the performance of Brake Linings Friction Materials by improving wear resistance and friction consistency under extreme conditions. Below is a technical overview, including key parameters, advantages, and storage guidelines.
Technical Parameters of Corundum in Brake Linings Formula
| Property | Specification | Test Method |
|---|---|---|
| Al₂O₃ Content | ≥99% | XRF Analysis |
| Hardness (Mohs Scale) | 9 | ASTM E18 |
| Melting Point | ~2050°C | ASTM D3418 |
| Particle Size (μm) | 10-200 (adjustable for formulation) | Laser Diffraction |
| Bulk Density (g/cm³) | 3.9-4.1 | ASTM B212 |
| Thermal Conductivity | 30-35 W/m·K | ASTM E1461 |
| Operating Temperature | -50°C to 1600°C | ISO 26865 |
| Content in Formula | 5-25% (by weight) | Custom formulation |
Advantages of Corundum in Brake Linings Ingredients
- Superior Abrasive Performance:
Corundum’s high hardness (Mohs 9) effectively grinds down brake rotor surfaces, ensuring optimal contact and friction in Brake Linings Mixes. - Thermal Stability:
Withstands extreme temperatures (up to 1600°C), preventing brake fade and maintaining friction stability in high-speed braking scenarios. - Wear Resistance:
Reduces material loss in brake linings friction materials, extending service life by 20-30% compared to conventional abrasives like silica. - Noise Reduction:
Its uniform particle distribution minimizes vibration and squeal in brake linings mixtures, enhancing driving comfort. - Environmental Compatibility:
Free from hazardous substances (e.g., copper, asbestos), aligning with global regulations for eco-friendly brake linings formula.
Storage and Packaging Guidelines
To preserve corundum’s properties in brake linings ingredients:
- Packaging: Use multi-layer moisture-proof bags (e.g., laminated polyethylene) or sealed containers to prevent contamination.
- Storage Conditions:
- Temperature: <35°C
- Humidity: <50% RH
- Avoid exposure to acidic/alkaline environments.
- Shelf Life: 24 months in unopened, dry packaging.
Typical Applications in Brake Linings Formula
Corundum is commonly blended with:
- Binders: Phenolic resins or polyimide.
- Reinforcements: Aramid fibers, steel wool.
- Friction Modifiers: Graphite, calcined petroleum coke.
This hybrid Brake Linings Mixture achieves a balance of high friction efficiency, thermal management, and environmental compliance.