Stable and super-low friction of amorphous carbon nitride coatings in nitrogen gas by using two-step ball-on-disk friction test

Pengfei Wang, Masakatsu Sugo, Koshi Adachi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Effect of running-in process on friction behaviour of carbon nitride (CNx) coating in N2 gas stream was investigated with a newly introduced two-step ball-on-disk friction test, where the rubbed Si3N4 ball in the pre-sliding (step 1) was replaced by a new CNx-coated Si3N4 ball in the subsequent sliding stage under N2 gas (step 2). The two-step friction test is clarified to be a simple but effective technique for obtaining contact material combination of self-mated CNx coatings and for achieving stable and low frictions of CNx coatings. Friction coefficients of CNx/CNx in N2 gas stream decrease greatly from 0.07 without pre-sliding to less than 0.025 in two-step friction tests. The minimum friction coefficient of 0.004 was obtained by introducing 500 cycles of pre-sliding in ambient air. These stable and low frictions are attributed to the generation of self-mated CNx coatings and the formation of a lubricious layer on the disk surface.

Original languageEnglish
Pages (from-to)137-149
Number of pages13
JournalLubrication Science
Volume27
Issue number3
DOIs
Publication statusPublished - 2015 Apr 1

Keywords

  • carbon nitride
  • friction coefficient
  • nitrogen gas
  • pre-sliding
  • running-in

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Materials Chemistry

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