Aplicação de filmes finos sobre superfície metálica para redução de desgaste em sistema de injeção de combustível
This thesis addresses the application of thin films of molybdenum disulfide (MoS2) and titanium nitride (TiN), applied in multilayers using the technique of magnetron sputering, and thin films of carbon type diamond with embedded silicon (silicon-incorporated diamond- like carbon - DLC-Si), appli...
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Formato: | doctoralThesis |
Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/handle/123456789/31004 |
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Resumo: | This thesis addresses the application of thin films of molybdenum disulfide
(MoS2) and titanium nitride (TiN), applied in multilayers using the technique of
magnetron sputering, and thin films of carbon type diamond with embedded silicon
(silicon-incorporated diamond- like carbon - DLC-Si), applied in multilayers using
the PECVD technique using silane + methane. The applications were carried out
on surfaces of SAE 1045 steel substrates, using a third set of samples without
coatings as Control Samples. For the provision of wear on the samples, a
tribometer, of the cylinder-on-disc type (tribocam), was developed, whose operation
is close to that which occurs with some components of the Common Rail Injection
System (C.R.I.S.). The samples were immersed in diesel S-10 B10 and were
submitted to a sliding contact under cyclic load for predefined periods. The
characterization and mechanics and tribology of the films was carried out through
the evaluation of microstructural aspects by electron microscopy, semi-quantitative
chemical analysis, spectroscopy Raman,uniformity, in addition to methods such as
mass loss, roughness and microhardness. The results showed by the evolutionary
evaluation of the microscopy images, both coatings responded with greater
efficiency in reducing wear compared to uncoated samples. Despite having a high
rate of mass loss in the first tests, the MoS2-TiN film obtained the lowest values of
roughness at the end of the last test, confirming its tribological potential in reducing
friction. For DLC-Si samples, roughness indexes above the rectification standard
were recorded. This is related to the composition of the deposition of these films.
However, such samples obtained lower rates of mass loss and showed the best
behavior in the medium used. |
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