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Massive nitrogen super-saturation into CoCrMo Alloys for improvement of tribological performance
AIZAWA Tatsuhiko, FUNAZUKA Tatsuya, SHIRATORI Tomomi, SUZUKI Yohei
download PDFAbstract. The cobalt-chromium-molybdenum (CoCrMo) superalloys have been utilized in the dental, knee, and hip arthroplasty applications because of their unique combination of high strength, high wear and corrosion resistance. A massive nitrogen supersaturation (MNS) process was proposed as a surface treatment to improve these strength, hardness and ductility, further needed for hip replacement and dental prosthesis. CoCrMo disc specimens were prepared for plasma immersion nitriding at 673 K for 21.6 ks by 50 Pa. The nitrogen solute uniformly distributed in the MNS-layer with the average content of 5 mass%. Higher surface hardness than 1550 HV was attained under application of 10 N. The maximum friction coefficient was halved before and after MNS and this low frictional state with μ< 0.45 was preserved although the sliding condition by 0.1 m/s.
Keywords
Plasma Nitriding, Cocrmo Alloys, Massive Nitrogen Interstitials, Low Friction and Wear
Published online 4/24/2024, 11 pages
Copyright © 2024 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA
Citation: AIZAWA Tatsuhiko, FUNAZUKA Tatsuya, SHIRATORI Tomomi, SUZUKI Yohei, Massive nitrogen super-saturation into CoCrMo Alloys for improvement of tribological performance, Materials Research Proceedings, Vol. 41, pp 1248-1258, 2024
DOI: https://doi.org/10.21741/9781644903131-139
The article was published as article 139 of the book Material Forming
Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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