Kaasuhiilistystä

Kaasuhiilistystä refers to a process in metallurgy where a solid material, typically iron or steel, is heated in an atmosphere containing carbon-rich gases. The purpose of this process is to increase the carbon content of the surface of the metal, a technique known as carburizing. This is achieved through a diffusion process where carbon atoms from the gas penetrate the surface of the workpiece at elevated temperatures.

The carbon-rich gases commonly used include carbon monoxide, methane, or propane. The temperature at which the process is carried out is critical, typically ranging from 800 to 1000 degrees Celsius, depending on the specific alloy and desired carbon concentration. The duration of the heating cycle also influences the depth of carbon penetration.

The primary benefit of kaasuhiilistystä is the creation of a hard, wear-resistant surface on the material while maintaining a softer, more ductile core. This combination of properties is highly desirable for components subjected to friction and abrasion, such as gears, bearings, and cutting tools. After the carburizing process, a subsequent heat treatment, often involving quenching and tempering, is performed to further enhance the hardness and toughness of the carburized layer.

Kaasuhiilistystä is a controlled surface hardening technique that modifies the material's composition to achieve improved mechanical properties. The process involves high-temperature diffusion of carbon into the metal's surface from a gaseous environment, followed by heat treatments to optimize the resulting microstructure.