Calcined Petroleum Coke Granules for Friction Materials

Particle Sizes: 20–40 mesh, 40–60 mesh, 80–120 mesh, etc.

Functions of Petroleum Coke Granules in Friction Materials

1. Adjust porosity and optimize moulding performance

    

   With inherent porous structure, the coke forms interconnected voids during hot pressing to avoid blistering, delamination and cracking of finished products. It improves the compression resilience of the formulation and prevents brittle fracture of brake pads during cold compaction.
2. Stabilize friction coefficient and restrain high-temperature fade

    

   The micro-pores of coke store and conduct frictional heat under high-temperature braking, quickly dissipating accumulated heat. It prevents sharp drop of friction coefficient above 300 ℃ (thermal fade) and delivers stable braking force across full temperature range.
3. Reduce noise and damp vibration to eliminate brake squeal

    

   Featuring low hardness and porous vibration-absorbing framework, the granules absorb frictional vibration waves to effectively relieve cold-brake squeal and high-frequency screech. It serves as an economical noise-reducing filler to partially substitute natural flake graphite.
4. Provide solid lubrication and protect mating rotor/drum

    

   A uniform carbon transfer film generates on the friction counterpart surface during braking, preventing aggressive scratching from steel fiber and reducing wear of brake discs, thus extending the service life of brake pads.
5. Lower product bulk density and cut raw material cost

    

   Its bulk density is lower than graphite and metallic powders, which reduces the overall weight of friction parts. Priced much lower than natural graphite, it can replace 15%~30% graphite dosage to remarkably reduce formulation cost.
6. Enhance bonding strength of base matrix

    

   The rough and porous surface allows phenolic resin to penetrate and anchor inside pores, strengthening interfacial bonding between resin and aggregates, and improving impact resistance and anti-cracking property of final friction products.