Calcined petroleum coke (CPC) is a high-carbon, low-ash carbonaceous filler widely used in friction materials such as disc brake pads, drum brake linings, and clutch facings. Beyond being a cost-effective alternative to graphite, it delivers critical performance benefits:
Stable friction coefficient – The layered microstructure of CPC helps form a uniform transfer film on the mating surface, minimizing fluctuations in friction output.
Enhanced fade resistance – With a typical thermal conductivity of 90–120 W/(m·K), CPC rapidly dissipates frictional heat, reducing surface temperature rise and delaying thermal fade.
Reduced wear rate – Its moderate hardness (Mohs 3–4) and high particle strength maintain structural integrity at elevated temperatures, lowering adhesive and abrasive wear.
Improved NVH performance – An optimized particle size distribution can adjust the damping characteristics of the friction compound, suppressing brake squeal and vibration.
Typical Technical Specifications (for calcined petroleum coke)
| Parameter | Typical Value | Effect on Friction Materials |
|---|---|---|
| Fixed Carbon | ≥ 98.5% | Ensures lubrication and high-temperature stability |
| Ash Content | ≤ 0.5% | Low ash reduces high-temperature abrasive wear |
| Sulfur Content | ≤ 0.8% | Prevents corrosion of metallic components at high temperatures |
| Volatile Matter | ≤ 0.3% | Guarantees thermal stability; reduces porosity |
| True Density | 2.05 – 2.10 g/cm³ | Affects packing efficiency and particle strength |
| Particle Size (D50) | 50 – 200 µm (customizable) | Controls friction surface morphology and noise |
| Mohs Hardness | 3 – 4 | Balances wear resistance and rotor-friendliness |
| Thermal Conductivity | 90 – 120 W/(m·K) | Enhances heat dissipation, reduces fade risk |
Selection Recommendations
For heavy-duty or high-performance braking, choose a low‑sulfur, low‑ash, fine-particle CPC (D50 ≤ 75 µm) with high true density.
For commercial vehicle drum brake linings, a medium particle size (D50 ≈ 150 µm) offers a good balance of performance and cost.
We supply customized petroleum coke grades with adjustable purity, particle size, and calcination degree to meet specific formulation needs.
0086-533-8173117
No. 15, Xishan Road, Nanding Town, Zibo, Shandong,China
0086-15315209201 0086-18953362119
emily@qingdaohengyue.com
