Bull Chemicals supplies high-purity alpha-alumina (Al₂O₃) corundum for brake pads mixture and brake pads friction materials , with purit y over 99% and a hexagonal crystal structure, which endows it with properties matching braking system requirements.
Table of Contents
First, Enhancing Wear Resistance
With a Mohs hardness of 9, the corundum outperforms common friction materials. Under standard conditions (150°C, 500N pressure), brake pads containing 15-20% of this corundum have a wear rate of 0.08-0.12 mm/1000 cycles, reducing wear by over 60% compared to non-corundum pads. This extends the brake pad service life from 30,000-40,000 kilometers to 60,000-80,000 kilometers.
Second, Ensuring Stable Friction Performance
Corundum has a decomposition temperature exceeding 2000°C. When added to brake pads at a ratio of 12-18%, the friction coefficient remains stable at 0.35-0.45 within the temperature range of 50°C to 450°C. Without corundum, the friction coefficient drops to 0.2-0.25 at 400°C, increasing braking distance by 20-30%.
Third, Improving Thermal Conductivity
The corundum’s thermal conductivity is 30-35 W/(m·K), 3-4 times that of resin binders (8-10 W/(m·K)) in brake pads. It efficiently dissipates heat, keeping the pad’s core temperature 20-30°C lower during continuous braking, thus preventing resin decomposition, pad deformation and brake disc warping.
Fourth, Boosting Mechanical Strength
With an average particle size of 5-10 μm, the corundum disperses evenly in the pad matrix to form a “reinforcement skeleton.” Brake pads with 10-15% corundum have a compressive strength of 180-220 MPa and a flexural strength of 35-40 MPa, avoiding cracking or chipping under sudden heavy braking.
Bull Chemicals tailors corundum specifications (particle size, purity) to meet clients’ formula needs for passenger cars, commercial vehicles and racing cars. As a core functional material, corundum directly elevates brake pad performance and safety. Bull Chemicals is committed to providing high-quality corundum and professional technical support for the automotive braking industry.
