Abstract
This article examines the critical role of process control in nitriding and ferritic nitrocarburizing (FNC) treatments, focusing on the measurement and regulation of nitriding potential (KN) and carbon activity (KC). The author demonstrates how modern sensor technology combined with automated programmable control systems can effectively eliminate process variability and ensure consistent, high-quality outcomes. The discussion covers fundamental principles of KN and KC control through proper utilization of sensors, analysis of key input variables, and the relationship between gas ratios, temperature, and time on treatment results. Various monitoring technologies are reviewed, including hydrogen sensors, CO/CO2 analyzers, oxygen probes, associated technical challenges, and maintenance requirements. By highlighting the importance of precise process parameter control, the article provides practical insights for achieving repeatable, high-quality surface treatments in industrial applications.
