Introduction to Corundum in Brake Linings Formulas
Corundum (α-Al₂O₃), a crystalline form of aluminum oxide, is a critical brake linings ingredient widely used in Brake Linings Friction Materials due to its exceptional hardness, thermal stability, and wear resistance. Its integration into brake linings mixtures enhances performance under extreme conditions, making it indispensable in high-demand automotive and industrial applications 1. Below is a detailed technical overview of its role, specifications, advantages, and storage guidelines.
Technical Parameters of Corundum in Brake Linings Formula
| Property | Specification | Test Method |
|---|---|---|
| Purity (Al₂O₃ Content) | ≥99% | XRF Analysis |
| Hardness (Mohs Scale) | 9.0 | ASTM D785 |
| Melting Point | 2050°C | ISO 21068-1 |
| Particle Size (μm) | 10-100 (adjustable for formulation) | Laser Diffraction |
| Thermal Conductivity | 30-40 W/m·K | ASTM E1461 |
| Operating Temperature | -50°C to 1200°C | ISO 26865 |
| Density (g/cm³) | 3.95-4.1 | ASTM B212 |
Advantages of Corundum in Brake Linings Mixes
- Superior Thermal Stability:
Corundum’s high melting point (2050°C) ensures structural integrity in brake linings friction materials during extreme braking, preventing degradation and maintaining consistent friction coefficients. - Enhanced Wear Resistance:
Its extreme hardness (9.0 Mohs) minimizes abrasive wear on rotors and extends the lifespan of brake linings mixtures. - Optimal Friction Modulation:
Acts as a friction stabilizer in brake linings formula, reducing noise and vibration while balancing dynamic friction across temperature ranges. - Chemical Inertness:
Resistant to oxidation and chemical reactions with other Brake Linings Ingredients (e.g., resins, steel fibers), ensuring long-term stability in harsh environments. - Compatibility with Hybrid Systems:
Easily integrates with binders (phenolic resins), reinforcements (aramid fibers), and lubricants (graphite) in brake linings mixes, enabling tailored formulations for diverse applications.
Storage and Packaging Guidelines
To preserve the properties of corundum in brake linings formula:
- Packaging: Use moisture-resistant, UV-protected polyethylene bags or sealed containers with desiccants to prevent clumping.
- Storage Conditions:
- Temperature: <35°C
- Humidity: <50% RH
- Avoid contamination from dust, oils, or reactive chemicals.
- Shelf Life: 24-36 months in unopened, dry packaging.
Key Applications in Brake Linings Mixtures
Corundum is typically combined with:
- Binders: Phenolic resins or polyimide.
- Reinforcements: Steel fibers, ceramic particles.
- Lubricants: Graphite, molybdenum disulfide.
This Brake Linings Mixture achieves a balance of high friction efficiency, thermal resistance, and environmental compliance (e.g., low copper content).
For detailed technical specifications, consult material suppliers or refer to industry standards such as ASTM and ISO protocols.