scholarly journals Tribological properties of nano-graphite as an additive in mixed oil-based titanium complex grease

RSC Advances ◽  
2018 ◽  
Vol 8 (73) ◽  
pp. 42133-42144 ◽  
Author(s):  
Ming Niu ◽  
Jianjun Qu
Keyword(s):  
Tribological Properties ◽  
Additive Concentration ◽  
Titanium Complex ◽  
Mixed Oil ◽  
Titanium Complex Grease

Increasing the size of nano-graphite led to an increase in the optimum additive concentration and decrease in the degree of improvement in the tribological properties of grease.

Tribological properties and tribochemical analysis of nano-cerium oxide and sulfurized isobutene in titanium complex grease

2016 ◽  
Vol 93 ◽  
pp. 332-346 ◽  
Author(s):  
Tiejun Shen ◽  
Daxi Wang ◽  
Jimmy Yun ◽  
Qinglian Liu ◽  
Xinghua Liu ◽  
...  
Keyword(s):  
Cerium Oxide ◽  
Tribological Properties ◽  
Titanium Complex ◽  
Titanium Complex Grease

Experimental analysis of tribological properties of ultrasonically dispersed garnet nanoparticles in SN500 grade lubricating oil

2018 ◽  
Vol 70 (2) ◽  
pp. 250-255 ◽  
Author(s):  
Maheswaran R. ◽  
Sunil J.
Keyword(s):  
Tribological Properties ◽  
Lubricating Oil ◽  
Additive Concentration ◽  
Two Phase ◽  
Content Type ◽  
Lubricant Oil ◽  
Surface Polishing ◽  
Frequent Monitoring ◽  
Chemical Content ◽  
Solid Liquid

Purpose The optimal performance of the machinery is based on lubricants that require frequent monitoring and the analysis of characteristics such as chemical content, contamination and viscosity. The application of nanoparticles dispersed lubricant in tribology has received remarkable attention in recent years. This paper aims to investigate the tribological properties of SN500 grade lubricating oil containing garnet nanoparticles. Design/methodology/approach In this study, 45-nm-sized garnet particles are ultrasonically dispersed in SN500 grade base lubricant oil. The effects of viscosity and additive concentration on tribological properties are investigated using a four-ball tester. Findings Rolling, reinforcing and film-forming behaviour of dispersed nano-sized garnet additives in the rubbing zone were investigated using scanning electron microscopy equipped with energy dispersive spectroscopy. The results indicate that the garnet additives can improve the wear resistance and resistance to relative motion and decrease the friction coefficient of rubbing steel interface by surface polishing and formation of tribo-film containing Si, C and Mn. Originality/value Because of the complex two-phase solid–liquid mixture, there are still limited physical understandings of the friction and wear reduction mechanisms. Therefore, the present research was undertaken to interpret the possible phenomena.

Study of the Anti-Wear Properties of Coconut Oil Using Quantum Chemical Calculations and Tribological Tests

2006 ◽  
Vol 128 (3) ◽  
pp. 654-659 ◽  
Author(s):  
N. H. Jayadas ◽  
K. Prabhakaran Nair
Keyword(s):  
Fatty Acids ◽  
Molecular Orbital ◽  
Tribological Properties ◽  
Quantum Chemical ◽  
Coconut Oil ◽  
Carbon Chain ◽  
Carbon Chain Length ◽  
Additive Concentration ◽  
Wear Properties ◽  
Quantum Chemical Descriptors

In this paper Spartan 02, a molecular dynamics software, is used to analyze and predict the tribological properties of coconut oil in a qualitative manner on the basis of carbon chain length of the constituent fatty acids, their polarity (net electrostatic charge, Qr), the energies of the molecular orbitals E_HOMO (energy of the highest occupied molecular orbital), and E_LUMO (energy of the lowest unoccupied molecular orbital), and the heats of formations (H-Form) of the iron soaps of respective fatty acids. Tribological properties of the constituent fatty acids of coconut oil were evaluated using a four-ball tester as per ASTM D4172 method. The experimental results showed good correlation to the selected quantum chemical descriptors. The influence of an anti-wear additive on the tribological performance of coconut oil and the optimum additive concentration were also evaluated experimentally.

Friction and Wear Behavior of Titanium Complex Grease with Admixture Base Oil

2009 ◽  
Vol 419-420 ◽  
pp. 57-60
Author(s):  
Ji Hui Yin ◽  
Jian Jun Qu ◽  
Bao Yu Song ◽  
Dai Zhong Su
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Chemical Properties ◽  
Production Method ◽  
Mineral Oil ◽  
Base Oil ◽  
Titanium Complex ◽  
New Type ◽  
Further Development ◽  
Titanium Complex Grease

Most of the lubricants are made of mineral oil which has bad biodegradability, and, hence, seriously contaminate the environment. To minimise the lubricants’ impact on the environment, this research developed a new type of lubricant, titanium complex grease. Its base oil is the admixture of vegetable oil and mineral oil. Its production method and experimental results are presented in this paper. The friction, wear and physical-chemical properties of the grease were investigated. The morphology of wear scar of steel ball was observed using the sweep electron microscope. The results obtained contribute to the further development of environmentally friendly lubricants.

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