Abstract
Bright nitriding of a steel surface is demonstrated by an atmospheric-pressure pulsed-arc plasma jet, keeping the original metallic luster and low roughness. As the hydrogen fraction in the nitrogen–hydrogen gas mixture increases, the optical emission intensity of NH radicals decreases. Following this fact, we examine a method to suppress the formation of a compound layer, in which the hydrogen fraction increases from the conventional value of 1% to larger values for suppressing excess nitrogen supply. The hydrogen fraction of 4% provides a nitrided surface without a compound layer, where surface reflectance is largest and surface roughness is lowest. However, the nitriding treatment produces a dark spot several millimeters in diameter at the sample center due to local oxidization.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.