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The automotive industry is shifting its focus to non-exhaust emissions, particularly from brake systems, as tailpipe pollution decreases with the rise of electric and hybrid vehicles. Upcoming Euro 7 regulations are setting strict limits on brake-related particulate matter, compelling manufacturers to innovate. In response, Nitrex has developed Smart ONC®, a surface treatment technology designed to meet these new standards by enhancing brake rotor performance, durability, and sustainability.
Key Highlights
- As vehicle propulsion systems evolve, regulations are now targeting non-exhaust emissions, with a specific focus on brake dust.
- The upcoming Euro 7 standards impose strict limits on brake particulate emissions, driving innovation in braking technology.
- Nitrex’s Smart ONC® is a surface treatment that significantly reduces brake dust and corrosion, helping to meet these new regulatory demands.
- For heavy-duty applications, combining Smart ONC® with niobium-alloyed cast iron provides the necessary durability and wear resistance.
The Challenge of Brake Emissions
Traditional braking systems are a significant source of fine particulate matter, which contains heavy metals harmful to human health and the environment. The Euro 7 regulations are not just a compliance hurdle but a catalyst for developing cleaner, more efficient braking technologies. The industry’s challenge is to create systems that minimize emissions while preserving the safety and performance drivers expect.
An Innovative Solution: Smart ONC®
Nitrex’s Smart ONC® (Nitrocarburizing with In-Process Controlled Post-Oxidation) is a specialized heat treatment that enhances the surface of brake rotors. This dual process involves diffusing nitrogen and carbon into the metal to create a hard, wear-resistant layer. A subsequent post-oxidation step adds a dense, chemically bonded oxide film that improves corrosion resistance. This treatment results in a rotor surface that effectively resists wear, corrosion, and thermal distortion, which are primary contributors to brake dust.
This technology offers a practical and cost-effective path to Euro 7 compliance for mainstream passenger and light-duty vehicles. Key advantages include:
- Reduced Brake Dust: The hardened, oxidized surface minimizes material loss during braking, leading to a significant reduction in particulate emissions.
- Superior Corrosion Resistance: The protective oxide layer guards against rust and environmental wear, crucial for vehicles in harsh climates.
- Extended Rotor Longevity: The dual-layer protection reduces wear and tear, lowering maintenance requirements and replacement frequency.
- Environmentally Conscious: The process avoids the use of toxic chemicals, supporting sustainability by reducing waste and material consumption.
Solutions for Heavy-Duty Use
While Smart ONC® is ideal for standard vehicles, heavy-duty trucks and commercial vehicles require more robust materials to handle extreme braking conditions. For these applications, combining Smart ONC® with alloyed gray cast iron (GCI) containing niobium is recommended.
Niobium is a microalloying element that refines the iron’s microstructure and forms extremely hard niobium carbides (NbC). These carbides provide exceptional abrasion resistance and thermal stability, significantly reducing material wear under high loads. When niobium-alloyed rotors undergo the Smart ONC® treatment, the result is a multi-layered defense against wear, corrosion, and thermal fatigue, making it an ideal solution for commercial fleets.
Global Scalability and Partnership
Designed for industrial scalability, the Smart ONC® process utilizes modular furnace systems that support high-volume, automated production. This allows for seamless integration into existing OEM manufacturing lines, ensuring consistent quality and cost-efficiency for global deployment. Nitrex is actively seeking partnerships with automotive manufacturers and engineers to advance this sustainable technology and shape a cleaner future for braking systems.
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