Surface modification of polyethylene by nitrogen PIII: Surface chemical and nanomechanical properties

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4 Citations (Scopus)

Abstract

Ultra-high molecular weight polyethylene (UHMWPE) was surface treated by nitrogen plasma immersion ion implantation (PIII), with the main aim of improving its wear resistance. Accelerating voltages (U) between 15 and 30 kV, fluences (F) between 1×1017 and 3×1017 cm -2 and fluence rates (FR) between 3×1013 and 7×1013 cm-2 s-1 have been applied. XPS was used to characterise the surface chemical composition and structure. Changes induced in the surface mechanical properties like hardness (H), reduced modulus (E) and in the tribological property of volume loss upon uniform wear test (V) were studied by nanoindentation and multipass wear measurements. The evolution of surface topography was followed by measuring the mean roughness (R a). The macroscopic temperature (T) developed during the Pill-treatment was also studied. Incorporation of N and O took place into the surface layer. With the increase of U the surface N-content tended to decrease. The bulk plasmon loss energy of the C Is peak increased from 20 eV up to about 25 eV, suggesting densification and the formation of amorphous hydrogenated carbon nitride-like layer. H, T and Ra increased, and V decreased upon PIII treatment, while E either decreased or increased depending on the actual process parameter set applied. In the parameter range studied H max, Emax and Ra.max values have been observed at Umax, Fmax and FRmin. Vmin and Tmax have been observed at Umax, Fmin and FRmax, suggesting that the thermal effect is a dominant factor in determining the extent of reduction in the wear rate.

Original languageEnglish
Title of host publicationMaterials Science, Testing and Informatics III - Proceedings of the 5th Hungarian Conference on Materials Science, Testing and Informatics
Pages255-262
Number of pages8
Publication statusPublished - Dec 1 2007
Event5th Hungarian Conference on Materials Science, Testing and lnformatics - Balatonfured, Hungary
Duration: Oct 9 2005Oct 11 2005

Publication series

NameMaterials Science Forum
Volume537-538
ISSN (Print)0255-5476

Other

Other5th Hungarian Conference on Materials Science, Testing and lnformatics
CountryHungary
CityBalatonfured
Period10/9/0510/11/05

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Keywords

  • Nanomechanical properties
  • Plasma immersion ion implantation
  • Ultra-high molecular weight polyethylene
  • XPS

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Tóth, A., Bertóti, I., Mohai, M., & Ujvári, T. (2007). Surface modification of polyethylene by nitrogen PIII: Surface chemical and nanomechanical properties. In Materials Science, Testing and Informatics III - Proceedings of the 5th Hungarian Conference on Materials Science, Testing and Informatics (pp. 255-262). (Materials Science Forum; Vol. 537-538).