Influence Of Aluminum Nanoparticles Additives On The Tribological Properties Of Lubricating Oils

• Main Authors: LE, NGUYEN ANH VU, 李阮英武
• Other Authors: LIN, JAU-WEN
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/t34s7r

博士 === 國立高雄應用科技大學 === 機械工程系 === 105 === The objective of this research is to study the influence of aluminum nanoparticles additives on the tribological properties of two different lubricants include SN150 base oil and aqueous glycerol solution. Firstly, the effect of aluminum nanoparticles, oleic acid as dispersants, rotational speed and applied load on the tribological behavior of a lubricant are investigated. The experiments are performed on a pin-on-disc tribotester at a normal force from 30 N to 120 N and a rotational speed ranging from 150 rpm to 600 rpm. Both the aluminum nanoparticles and oleic acid are in concentrations from 0 to 1 wt% and are added to the SN150 base oil. The results revealed that the addition of aluminum nanoparticles and oleic acid to the base oil will lead to significant friction reduction and anti-wear properties. The coefficient of friction (COF) and wear rate decreased after an increase in the concentration of nanoparticles and oleic acid, and an optimum concentration level was exhibited in which both COF and wear-rate were lowest. The viscosity and temperature of the lubricant are also evaluated. The mechanisms of nanoparticle action used to prevent friction and subsequent wear are also analyzed. Secondly, the tribological properties of glycerol lubricant with aluminum nanoparticles as an additive and sodium dodecyl sulfate (SDS) as the dispersive medium for iron to iron friction using a pin-on-disc tribotester are investigated. Meanwhile, the effects of different concentrations of aluminum nanoparticles, SDS and deionized water in glycerol on tribology properties of iron to iron friction were studied. The experimental parameters were setup according to Taguchi technique, their influence on the coefficient of friction (COF) and wear rate were examined by response surface methodology (RSM) and analysis of variance (ANOVA) methods. The analysis results were employed to optimize the parameters to obtain the best lubricant effects. The optimal combination of the parameters for both minimum COF and wear rate was found to be 0.6667 weight percent (wt%) of aluminum nanoparticles, 2 wt% of SDS and 10 wt% of deionized water content of glycerol. The wear surface topography and the average roughness of the surface were also examined using a scanning electron microscope (SEM) and a Mitutoyo Surftest SJ 400 instrument. The results show that aluminum nanoparticles used as an additive in lubricant reduce the surface roughness of a disc remarkably. The energy dispersive spectrometer (EDS) was utilized to confirm the deposition of aluminum nanoparticles on the disc surface leading to decreased friction and wear.