Avaliação microestrutural dos efeitos de grafeno em revestimentos a base de metal duro para aplicações em ativos petrolíferos
The addition of graphene in alloys has become an object of interest in the research and development of coatings. This material tends to improve properties such as wear and corrosion resistance of the coatings, resulting in an increase in the lifetime of assets in the oil and gas, automotive, and...
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| Materialtyp: | Dissertação |
| Språk: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Länkar: | https://repositorio.ufrn.br/handle/123456789/49700 |
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| Sammanfattning: | The addition of graphene in alloys has become an object of interest in the research
and development of coatings. This material tends to improve properties such as wear
and corrosion resistance of the coatings, resulting in an increase in the lifetime of
assets in the oil and gas, automotive, and mining industries, among others. In this
study, graphene oxide was synthesized and mixed with tungsten carbide – 12 wt%
cobalt powder mixture with four different concentrations of 0, 0.5, 0.75, and 1 wt%. The
prepared mixtures were thermally sprayed on 1020 steel plates using HVOF thermal
spray technique. Powder mixtures and applied coatings were characterized by XRD,
SEM-FEG, Raman, bending test, and Vickers microhardness. The results show that
there was no phase change of graphene oxide after the thermal spray process. The
coating with 0.5 wt% of graphene obtained higher hardness values than the other
compositions, proving that graphene improves the mechanical properties of the
coating. However, the compositions with higher graphene contents showed
embrittlement and defects in their microstructure. |
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