Nanoindentation mechanical properties characterization of glassy polymeric carbon treated with ion beam

M. G. Rodrigues, N. C. Da Cruz, E. C. Rangel, R. L. Zimmerman, D. Ila, D. B. Poker, D. K. Hensley

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Phenolic resins when heat treated in inert atmosphere up to 1000 °C become glassy polymeric carbon (GPC), a chemically inert and biocompatible material useful for medical applications, such as in the manufacture of heart valves and prosthetic devices. In earlier work we have shown that ion bombardment can modify the surface of GPC, increasing its roughness. The enhanced roughness, which depends on the species, energy and fluence of the ion beam, can improve the biocompatibility of GPC prosthetic artifacts. In this work, ion bombardment was used to make a layer of implanted ions under the surface to avoid the propagation of microcracks in regions where cardiac valves should have pins for fixation of the leaflets. GPC samples prepared at 700 and 1500 °C were bombarded with ions of silicon, carbon, oxygen and gold at energies of 5, 6, 8 and 10 MeV, respectively, and fluences between 1.0 × 1013 and 1.0 × 1016 ions/cm2. Nanoindentation hardness characterization was used to compare bombarded with non-bombarded samples prepared at temperatures up to 2500 °C. The results with samples not bombarded showed that the hardness of GPC increases strongly with the heat treatment temperature. Comparison with ion bombarded samples shows that the hardness changes according to the ion used, the energy and fluence.

Original languageEnglish
Pages (from-to)524-529
Number of pages6
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume191
Issue number1-4
DOIs
StatePublished - May 2002

Funding

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (proc. 96/01386-2 and 96/04979-4) and Alabama A&M University are thanked for financial support.

Keywords

  • Glassy polymeric carbon
  • Hardness
  • Ion beam

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