Nitrocarburieren

Nitrocarburieren, also known as nitrocarburizing, is a thermochemical surface treatment process used to enhance the hardness, wear resistance, and corrosion resistance of steel and alloy components. The process involves diffusing nitrogen and carbon atoms into the surface layer of a metallic workpiece at relatively low temperatures, typically between 550°C and 580°C. This treatment creates a hard, superficial layer known as a diffusion zone, which improves the mechanical and chemical properties of the material.

The process can be performed using different methods, including salt bath, gas, or plasma nitrocarburizing. Salt bath nitrocarburizing involves immersing the workpiece in a molten salt mixture containing nitrogen and carbon sources. Gas nitrocarburizing utilizes ammonia or other nitrogen-containing gases, while plasma nitrocarburizing employs ionized gases under low pressure to facilitate atom diffusion.

Nitrocarburizing is favored for its ability to improve surface hardness without significantly affecting the core properties of the material. The typical surface hardness achieved ranges from 50 to 64 HRC, depending on process parameters and material composition. Besides improving wear resistance, nitrocarburized surfaces generally exhibit enhanced resistance to corrosion, oxidation, and fatigue.

The process is widely used in automotive, aerospace, and tooling industries, especially for components subjected to high wear and corrosive environments, such as gears, shafts, and cutting tools. The treatment can also be combined with additional processes like oil or polymer quenching to further enhance specific properties.

Overall, nitrocarburizing offers a cost-effective and efficient way to extend the service life of metallic parts by creating durable, corrosion-resistant surfaces through controlled diffusion mechanisms.