Improvement in Tribological Properties with Addition of Hexagonal Boron Nitride (h-BN) and Molybdenum Disulfide (MoS2) Nanoparticles in Aerospace Lubricants

In the aircraft mounted accessory gearbox and gas turbine engine gearbox, a significant rise in temperature of lubricant was consistently observed due to the high coefficient of friction (COF) between the moving parts. This phenomenon limits the speed and power transmission of the gearbox. To resolv...

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Bibliographic Details
Published in:Tribology transactions 2024-07, Vol.67 (4), p.702-714
Main Authors: Senthil Kumar, Munisamy, Elayaperumal, Ayyasamy, Vidhya Sagar, Sivakumar Sandhya, Meenu, Srivastava
Format: Article
Language:English
Subjects:
aerospace
Aerospace engines
Ball tests
Boron nitride
Coefficient of friction
Four ball testers
Friction resistance
Gas turbine engines
Gearboxes
h-BN
lubricant
Lubricants
Lubricants & lubrication
Mechanical properties
Molybdenum
Molybdenum disulfide
MoS
nanoadditives
Nanoparticles
Shear
Stability tests
Tribology
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Summary:In the aircraft mounted accessory gearbox and gas turbine engine gearbox, a significant rise in temperature of lubricant was consistently observed due to the high coefficient of friction (COF) between the moving parts. This phenomenon limits the speed and power transmission of the gearbox. To resolve this, the current study recommends adding specific nanoparticles (NP) as an additive to the military (MIL) grade lubricant to reduce frictional resistance between the gears. Surfactants were also added to hexagonal boron nitride (h-BN) and molybdenum disulfide (MoS 2 ) nanolubricants (NL) to improve NP suspension. Tribological investigations were conducted with a four-ball tester, a shear stability tester, and a Reichert tester to examine the lubricants. During the four-ball test, the wear scar diameter (WSD) on the specimen decreased by 16.73% and 12.3% with h-BN and MoS 2 NL, respectively, compared to the results obtained using the base lubricant (BL). In the shear stability test, h-BN NL demonstrated 93%, and MoS 2 NL demonstrated 67% more shear stability than the BL, while the COF was reduced by 13% in both h-BN and MoS 2 NLs during the Reichert test. These test results prove that h-BN and MoS 2 NPs, when added to a MIL standard BL, can demonstrate improved tribological capabilities even at extreme operational conditions.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402004.2024.2373206