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Article

Thermal Stability and Lubrication Properties of Biodegradable Castor Oil on AISI 4140 Steel

1
Tecnológico Nacional de México/Instituto Tecnológico de Celaya, Apartado Postal 57, Celaya 38010, Mexico
2
Facultad de Química, Universidad de Guanajuato, Noria Alta S/N, Guanajuato 36050, Mexico
*
Author to whom correspondence should be addressed.
Metals 2018, 8(6), 428; https://doi.org/10.3390/met8060428
Received: 9 May 2018 / Revised: 1 June 2018 / Accepted: 2 June 2018 / Published: 6 June 2018
Lubricants have much importance in several industries, principally serving to reduce friction and wear in mechanical elements. In this study, the influence of Castor oil as bio-lubricant on the friction and wear performance of AISI 4140 steel was investigated. For that purpose, pin-on-disk friction tests were conducted according to ASTM G-99, by using pins of tungsten carbide (WC) as counterparts. The experiments were performed at two different temperatures. This work also presents the Attenuated Total Reflection Fourier Transform Infrared Spectroscopy (ATR-FTIR) and 1H-NMR analyses for the chemical characterization of oils and a study of their degradation by oxidation. The analysis of the damage caused to steel due to friction was deepened by analyzing its microhardness and microstructure in the worn zone. As a reference, the same experiments were performed with a commercial oil. The friction behavior of 4140 steel/WC with Castor oil lubrication at the two temperatures was notably better than that obtained under the reference oil lubrication. The kinetic friction coefficient (µk) was up to 76% lower. However, a slight increase in steel wear was observed under Castor oil lubrication. Despite this, these results suggest that Castor oil could be used as bio-lubricant in systems which are susceptible to levels of high friction. View Full-Text
Keywords: AISI 4140 steel; sliding friction; bio-lubricant; Castor oil; microhardness; microstructural change; FTIR; 1H-NMR AISI 4140 steel; sliding friction; bio-lubricant; Castor oil; microhardness; microstructural change; FTIR; 1H-NMR
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MDPI and ACS Style

Hernández-Sierra, M.T.; Aguilera-Camacho, L.D.; Báez-García, J.E.; García-Miranda, J.S.; Moreno, K.J. Thermal Stability and Lubrication Properties of Biodegradable Castor Oil on AISI 4140 Steel. Metals 2018, 8, 428. https://doi.org/10.3390/met8060428

AMA Style

Hernández-Sierra MT, Aguilera-Camacho LD, Báez-García JE, García-Miranda JS, Moreno KJ. Thermal Stability and Lubrication Properties of Biodegradable Castor Oil on AISI 4140 Steel. Metals. 2018; 8(6):428. https://doi.org/10.3390/met8060428

Chicago/Turabian Style

Hernández-Sierra, María T., Luis D. Aguilera-Camacho, José E. Báez-García, J. S. García-Miranda, and Karla J. Moreno 2018. "Thermal Stability and Lubrication Properties of Biodegradable Castor Oil on AISI 4140 Steel" Metals 8, no. 6: 428. https://doi.org/10.3390/met8060428

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