Carbide-Coated Brake Discs
Carbide-coated brake discs use a thin, hard carbide-based friction layer on a metal disc substrate, rather than making the entire disc from carbide.
What the coating changes
One production example applies tungsten carbide to a grey-cast-iron disc. The hard surface is intended to reduce wear, corrosion, and brake-dust formation while retaining a conventional metal disc as the structural and thermal base. The coating, application process, surface finish, and compatible pad material form one engineered system; the label alone does not define identical performance across suppliers.
Carbide-coated discs are not the same as carbon-ceramic discs. They keep a metal substrate and use a surface treatment, whereas a ceramic-composite disc uses a different body material and manufacturing route. They also should not be confused with decorative or temporary anti-corrosion coatings.
The corrosion and dust characteristics can be useful on EVs because regenerative braking may leave the friction brakes idle for longer periods. Friction brakes are still required whenever regeneration cannot provide the requested deceleration.
For the wider brake-system design and EV-specific operating pattern, see Brake Systems.