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Physical and rheological investigation of vegetable oils and their effect as lubricants in mechanical components

Published online by Cambridge University Press:  04 November 2019

Ricardo Ortega-Álvarez ,
Guillermo E. Aguilar-Cortés ,
María T. Hernández-Sierra Open the ORCID record for María T. Hernández-Sierra [Opens in a new window] ,
Luis D. Aguilera-Camacho ,
J. S. García-Miranda  and
Karla J. Moreno
Ricardo Ortega-Álvarez
Affiliation:
Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
Guillermo E. Aguilar-Cortés
Affiliation:
Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
María T. Hernández-Sierra
Affiliation:
Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
Luis D. Aguilera-Camacho
Affiliation:
Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
J. S. García-Miranda
Affiliation:
Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
Karla J. Moreno*
Affiliation:
Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
*
*(Email: [email protected])
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Abstract

The aim of this investigation was to study castor, canola, and sesame vegetable oils in order to evaluate their potential use as lubricants in steel mechanical components. For this purpose, densities of each oil were evaluated using the pycnometer method, as well as their dynamic viscosities through a Brookfield DV-II rotational viscometer. Both properties were evaluated at temperatures of 25, 40 and 100 °C. Additionally, viscosity indexes were determined according to ASTM D 2270. These rheological properties were used to estimate the lubrication regime considering parameters of real contact conditions in mechanical components. Friction and wear analyses were carried out to investigate the behaviour of the vegetable oil as lubricants. Such tests were carried out at room temperature on a CSM tribometer with pin-on-disk configuration by using castor, canola and sesame oils as lubricants. AISI 4140 hardened steel against AISI 100Cr6 steel pin was used as a mechanical component. From the rheological study, it was observed that canola and sesame oils behave as dilatant fluids at the evaluated temperatures, while castor oil behaves like a Newtonian fluid at 25 and 40 °C. Castor oil showed the highest density value among oils studied, but it also exhibited the lowest value of viscosity index (271). Contrarily, sesame oil was the least dense, but it exhibited the highest viscosity index (545). On the other hand, the lubrication regime study showed that by using castor oil as a lubricant in the mechanical component (4140/100Cr6), the system worked in a mixed lubrication regime while by using canola and sesame oils the system operated in boundary lubrication conditions. Finally, the kinetic friction coefficients were different for each lubricant obtaining the lowest value with castor oil while the highest value of friction coefficient was exhibited by the sesame oil lubricant.

Keywords

environmentally benignorganiclubricanttribologysteel
Type
Articles
Information
MRS Advances , Volume 4 , Issue 59-60: International Materials Research Congress XXVIII , 2019 , pp. 3291 - 3297
Copyright
Copyright © Materials Research Society 2019 

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