Propriedades tribomecânicas de superfícies de titânio carbonitretadas por plasma
Interstitial compounds of titanium have been mainly studied due to the large range of properties acquired when C, N, O and H atoms are added. In this work, surfaces of TiCxNy were produced by thermochemical treatments assisted by plasma with different proportions of Ar + N2 + CH4 gas mixture. The...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/12752 |
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| Resumo: | Interstitial compounds of titanium have been mainly studied due to the large range of
properties acquired when C, N, O and H atoms are added. In this work, surfaces of TiCxNy
were produced by thermochemical treatments assisted by plasma with different proportions of
Ar + N2 + CH4 gas mixture. The Ar gas flow was fixed in 4 sccm, varying only N2 and CH4
gas flows. During the thermochemical treatment, the plasma was monitored by Optical
Emission Spectroscopy (OES) for the investigation of the influence of active species. After
treatments, C and N concentration profile, crystalline and amorphous phases were analyzed
by Nuclear Reaction (NRA). Besides tribomechanical properties of the Ti surface were
studied through the nanohardness measurements and friction coefficient determination. The
worn areas were evaluated by profilometry and Scanning Electronic Microscope (SEM) in
order to verify the wear mechanism present in each material. It has been seen which the
properties like nanohardness and friction coefficient have strong relation with luminous
intensity of species of the plasma, suggesting a using of this characteristic as a parameter of
process |
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