The effect of humidity on friction behavior of hydrogenated HIPIMS W-C:H coatings

František Lofaj, Hiroyoshi Tanaka, Radovan Bureš, Yoshinori Sawae, Margita Kabátová, Kanao Fukuda

Research output: Contribution to journalArticlepeer-review

Abstract

The study of the effect of humidity on friction behavior in HiPIMS (High Power Impulse Magnetron Sputtering) W-C:H coating/steel ball system confirmed the formation of transfer layer adhered to the ball and consisting of hydrogenated carbon, ferritungstate and small amounts of tungsten (sub)oxides and iron oxides. The corresponding mechano(tribo)chemical reactions driven by flash temperature in the sliding asperities involved oxidation, water vapor dissociation and carbon hydrogenation. Such composition agreed with the results of modelling based on the minimization of free Gibbs energy in the mutually interacting thermochemical reactions. The applicability of modelling to friction was attributed to fast reactions among microscopic asperities eliminating kinetical factors. In inert atmospheres, oxidation and hydrogenation were suppressed and friction seemed to be controlled by the amount of additional carbon.

Original languageEnglish
Article number127899
JournalSurface and Coatings Technology
Volume428
DOIs
Publication statusPublished - Dec 25 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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