Physical and rheological investigation of vegetable oils and their effect as lubricants in mechanical components
- PDF / 1,375,873 Bytes
- 7 Pages / 432 x 648 pts Page_size
- 16 Downloads / 159 Views
MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.407
Physical and rheological investigation of vegetable oils and their effect as lubricants in mechanical components Ricardo Ortega-Álvarez, Guillermo E. Aguilar-Cortés, María T. Hernández-Sierra, Luis D. Aguilera-Camacho, J. S. García-Miranda, and Karla J. Moreno Tecnológico Nacional de México en Celaya, Apartado Postal 57, 38010-Celaya, Guanajuato, México.
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.
INTRODUCTION: Pure vegetable oils have been used as lubricants for earliest times and until the boom of the oil industry [1]. However, due to the increase in oil costs, expectations of
Downloaded from https://www.cambridge.org/core. The Librarian-Seeley Historical Library, on 12 Jan 2020 at 00:37:58, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2019.407
their reserves, environmental policies, biodegradability, and effects on health, sustainable lubricant alternatives have been sought [1-7]. Therefore, new biological-based products are desired with a similar or better performance than petroleum products [5]. Some studied substances are vege
Data Loading...
