Nitriding, deeper: why this course exists

Gas, salt-bath, plasma, or a low-temperature variant for stainless. Each delivers nitrogen by a different mechanism, runs in different equipment, and produces a different compound layer chemistry. Gas runs ammonia at 450-590°C in a sealed retort, typical cycle 40-80 hours. Plasma uses a low-pressure N₂/H₂ glow discharge at 380-560°C, typical cycle 10-30 hours. Salt-bath runs molten cyanate salts at 550-590°C, typical cycle 90 minutes to 6 hours and almost always with a carbon source (FNC). Lessons 3 through 6 cover the families one at a time.