Desenvolvimento e avaliação tribológica de emulsão O/A a partir de óleo vegetal epoxidado para aplicação em fluídos de corte
The cutting fluids are lubricants used in machining processes, because they present many benefits for different processes. They have many functions, such as lubrication, cooling, improvement in surface finishing, besides they decreases the tool wear and protect it against corrosion. Therefore due...
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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/123456789/19829 |
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| Resumo: | The cutting fluids are lubricants used in machining processes, because they present many
benefits for different processes. They have many functions, such as lubrication, cooling,
improvement in surface finishing, besides they decreases the tool wear and protect it against
corrosion. Therefore due to new environment laws and demand to green products, new cutting
fluids must be development. These shall be biodegradable, non-toxic, safety for environment
and operator healthy. Thus, vegetable oils are a good option to solve this problem, replacing
the mineral oils. In this context, this work aimed to develop an emulsion cutting fluid from
epoxidized vegetable oil, promoting better lubrication and cooling in machining processes,
besides being environment friendly. The methodology was divided in five steps: first one was
the biolubricant synthesis by epoxidation reaction. Following this, the biolubricant was
characterized in terms of density, acidity, iodo index, oxirane index, viscosity, thermal
stability and chemical composition. The third step was to develop an emulsion O/A with
different oil concentration (10, 20 and 25%) and surfactant concentration (1, 2.5 and 5%).
Also, emulsion stability was studied. The emulsion tribological performance were carried out
in HFRR (High Frequency Reciprocating Rig), it consists in ball-disc contact. Results showed
that the vegetable based lubricant may be synthesized by epoxidationreaction, the spectra
showed that there was 100% conversion of the epoxy rings unsaturations. In regard the
tribological assessment is observed that the percentage of oil present in the emulsion directly
influenced the film formation and coefficient of friction for higher concentrations the film
formation process is slow and unstable, and the coefficient of friction. The high
concentrations of surfactants have not improved the emulsions tribological performance. The
best performance in friction reduction was observed to emulsion with 10% of oil and 5% of
surfactant, its average wear scar was 202 μm. |
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