Nitrogen-carbon diffusion method

Abstract

The invention proposes a nitrogen-carbon diffusion method capable of improving wear resistance, fatigue resistance, etc., by diffusing nitrogen and carbon gases into metal products. The nitrogen-carbon diffusion method comprises a process gas injection step to inject ammonia gas and carbon diffusion gas into the reaction chamber, an ammonia gas decomposition step to decompose ammonia gas to produce hydrogen gas, a nitrogen diffusion potential control step to maintain the closed state of the process gas supply until the nitrogen diffusion potential in the reaction chamber reaches a predetermined first reference value due to hydrogen gas, a carbon diffusion gas injection step to inject carbon diffusion gas into the reaction chamber, and a carbon diffusion potential control step to regulate the flow rate of the carbon diffusion gas injected into the reaction chamber until the carbon diffusion potential in the reaction chamber reaches a predetermined second reference value due to hydrogen gas and carbon diffusion gas.

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