Effect of bias voltage on the tribological and sealing properties of rubber seals modified by DLC films

JiaQi Liu, Zhiyu Wu, Huatang Cao, Feng Wen, Yutao T. Pei

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

Diamond-like carbon (DLC) films were deposited on nitrile butadiene rubber (NBR) by the DC magnetron sputtering under different bias voltages. Raman spectra revealed that the variation of bias voltage could tune the carbon bond structure in DLC films. Both the hardness and Young's modulus increased with the increasing bias voltage. Tribological tests revealed that the DLC-coated NBR prepared at the bias voltage of -200 V exhibited low wear rate due to its high hardness. The sealing property was studied by evaluating the leakage rate of volatile liquid in a simple apparatus. All DLC films resulted in less leakage rate as compared to the raw rubber under large stress. The lowest leakage rate occurred in the DLC-coated NBR prepared with a bias voltage of -200 V, which was associated with the theoretical calculations (Persson's theory). It was attributed to the synergetic effects of the variations of the Young's modulus and root-mean-square (Rms) roughness. The low Young's modulus and Rms, controlled by regulating bias voltage, could enhance actual contact area and reduce the leakage rate.

Original languageEnglish
Pages (from-to)391-399
Number of pages9
JournalSurface and Coatings Technology
Volume360
Early online date28-Dec-2018
DOIs
Publication statusPublished - 25-Feb-2019

Keywords

  • Diamond-like carbon film
  • Nitrile butadiene rubber
  • Tribology
  • Sealing property
  • Contact mechanics
  • DIAMOND-LIKE CARBON
  • CONTACT MECHANICS
  • HYBRID DEPOSITION
  • NANOINDENTATION
  • MICROSTRUCTURE
  • FRICTION
  • MODULUS
  • SURFACE
  • INDENTATION
  • PERFORMANCE

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