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Erschienen in:
Mechanical Properties of Engineering Materials: Relevance in Design and Manufacturing Kapitel lesen Erstes Kapitel lesen

2018 | OriginalPaper | Buchkapitel

4. Gradation, Dispersion, and Tribological Behaviors of Nanometric Diamond Particles in Lubricating Oils

verfasst von : Kai Wu, Bo Wu, Chuan Li, Xianguo Hu

Erschienen in: Introduction to Mechanical Engineering

Verlag: Springer International Publishing

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Abstract

To improve the dispersion characteristics of nanometric diamond in lubricating oil and optimize its tribological properties, the gradation, dispersion, and tribological behaviors of nanometric diamond particles in lubricating oils were studied in this chapter. The dispersion characteristics of modified nanometric diamond in lubricating oils were observed by centrifugal and static methods. The four-ball tribometer was performed to study the tribological properties of the modified nanometric diamond as additive in hydraulic fluid. The morphology, particle size, surface functional groups, and structure composition of diamond powders before and after modification were analyzed and compared by means of FE-SEM, Zeta, FTIR, and XRD. Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and Raman spectroscopy were selected to characterize the worn scar surface after rubbing process. The results showed that the modified nanometric diamond particle was fined, the surface functional group number was increased, and the steric effect in lubricating oil was produced, so that it exhibited excellent dispersion stability. Modified nanometric diamond as lubricating additives has good anti-wear and friction-reducing performance in hydraulic oil is mainly attributed to a large amount of small nanometric diamond particles, some fined particles fill and repair the rough surfaces of the friction pairs, and part of them enters the interface between the friction pairs to form rolling effect, which improves the anti-wear and friction-reducing properties.

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Vorheriges Kapitel Coin Minting
Nächstes Kapitel Basics and Applications of Thermal Engineering
Glossar
Surface energy
Surface energy is a measure of the destruction of intermolecular bonds when material surfaces are created.
Disaggregation
The agglomeration structure of powder was broken by screening, mechanical grinding, preparation of high dispersion suspension and adding surfactant and so on.
Adsorption
An exotic molecule or atom or ion from an environment adheres to the surface of a solid by physical or chemical action.
Steric hindrance
The steric hindrance effect mainly refers to the spatial hindrance caused by the proximity of certain atoms or groups in the molecule to each other.
Dispersibility
Flocculation or droplets of solid particles in water or other homogeneous liquid medium can be dispersed into small particles suspended in the dispersion medium without precipitation.
Rubbing pair
A system consisting of two objects that move relatively in contact with the surface.
Wear scar
Damage marks left on the friction surface after the friction and wear of the solid surface, which are the important basis for evaluating the type of wear.
Abrasive wear
The wear caused by the act of extruding or moving along the surface of a solid surface by hard particles or rigid bodies. The wear caused by the hard particles or hard body on the solid surface extrusion and along the surface movement.
Ploughing
The softer surface of the two surface of the relative motion results in groove damage due to plastic deformation.
Graphitization
Graphitization refers to the orderly transformation of carbon atoms which are thermodynamically unstable from disordered structure to graphite crystal structure.
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Metadaten
Titel
Gradation, Dispersion, and Tribological Behaviors of Nanometric Diamond Particles in Lubricating Oils
verfasst von
Kai Wu
Bo Wu
Chuan Li
Xianguo Hu
Copyright-Jahr
2018
Buch
Introduction to Mechanical Engineering

Print ISBN: 978-3-319-78487-8

Electronic ISBN: 978-3-319-78488-5

Copyright-Jahr: 2018

DOI
https://doi.org/10.1007/978-3-319-78488-5_4

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