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The role of green silicon carbide 60# in brake pads

The role of green silicon carbide 60# in brake pads？

The role of green silicon carbide (GC) 60# in brake pads is specific and significant. It acts as a functional abrasive additive​ within the friction material’s composite matrix.
Here is a detailed breakdown of its role, benefits, and trade-offs.

1. What is Green Silicon Carbide 60#?

  • Green Silicon Carbide (GC):​ An artificially produced mineral known for its extreme hardness (9.5 on the Mohs scale, second only to diamond and boron carbide) and sharp, brittle crystalline structure. Its green color distinguishes it from the more common black silicon carbide.
  • 60# (60 Grit):​ This refers to the particle size. The “#” stands for “mesh,” which is a measure of grit coarseness. 60# is a relatively coarse grit, with an average particle size of about 250 microns. A lower mesh number means a larger, coarser particle.

2. The Primary Roles of Green Silicon Carbide 60# in Brake Pads

When added to the brake pad formulation, its coarse and hard nature serves several key functions:
1. To Generate and Stabilize Friction Coefficient:
This is its most critical job. The hard, sharp edges of the 60# grit particles mechanically “bite” into the cast iron of the brake rotor. This abrasive action is a primary source of the friction force that slows down the vehicle. It helps maintain a consistent level of friction, especially during the initial (“cold”) brake applications.
2. To Combat Fade and Manage Heat:
Green silicon carbide has excellent thermal conductivity and stability. Under high-temperature braking, it helps dissipate heat away from the friction surface. This helps prevent the organic resins in the brake pad from overheating and forming a glazed, slippery layer on the surface (a phenomenon known as “green fade”). By maintaining a clean, abraded surface, it contributes to consistent performance under moderate stress.
3. To Clean the Rotor Surface:
The abrasive action of the 60# grit continuously scrubs the brake rotor surface. It removes transfer layers, iron oxides (rust), and other contaminants that can build up on the rotor. This ensures direct metal-to-composite contact between the pad and rotor, leading to more predictable braking.
4. To Increase Wear Resistance (of the Pad itself):
By increasing the overall hardness of the brake pad composite, the addition of green silicon carbide can improve the pad’s resistance to abrasive wear, potentially increasing its service life.

The Trade-Offs and Downsides of Using a Coarse, Hard Abrasive

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