Synergistic Lubricating Behaviors of 3D Graphene and 2D Hexagonal Boron Nitride Dispersed in PAO4 for Steel/Steel Contact

Abstract

Nanomaterials as oil‐based lubricant additives improve the tribological properties of oils, and its enormous potential in oil‐based applications has attracted increasing attention. However, 2D materials have limited applications in industry due to its high price. 3D graphene (3D Gr) has become a substitute of 2D graphene because of its low price. Hexagonal boron nitride (h‐BN) is known as white graphene and is a material with potential lubrication applications. In this paper, the combination of the two different dimensions materials not only plays a significant role in reducing environmental pollution, but also exerts excellent properties of both materials. The results show that the mixed‐dimensional nanomaterials have good macroscopic lubricity under oil.

3D graphene/hexagonal boron nitride composite nanomaterials synergistically reduce the friction and wear of Steel‐DLC contacts

“…This work reports the tribological properties of 3D graphene(gr), h‐BN and their composite materials as steel‐DLC contact lubricant additives. Different from the previous research work [ 22 ] under oil conditions, this work found that 3D graphene and h‐BN composite nanomaterials can significantly reduce friction and wear under DLC film. It is verified once again that 3D graphene and h‐BN play a certain role in the anti‐friction and anti‐wear process.…”

“…Moreover, studies have proved that it plays a certain positive role in tribology. [ 21,22 ] Hexagonal boron nitride (h‐BN) called “white graphene” is a non‐toxic additive that promotes the shearing of its layered structure, which consists of strong intermolecular covalent bonds (B‐N) and weak interlamellar‐van der Waals forces. In the light of its extraordinary characteristics, h‐BN has become an attractive solid lubricant.…”

Taguchi optimization of various parameters for tribological performance of polyalphaolefins based nanolubricants

“…Where h min is lubricant minimum film thickness and r 1 and r 2 are the surface roughness of the ball and disc. The Hamrock and Dowson Equation 30 was adopted to compute the h min and it is presented in equation (3).…”

“…Furthermore, the lubricants act as a heat transfer agent, eliminate pollutants, preserve the metal surface from rust and corrosion and assimilate the impact and create a seal. 3 The lubricants are far from being ideal, and traditional petroleum-based lubricants have a limited service life. Hence the researcher has been seeking for high performance lubricants which can fulfil all required distinctive specifications.…”

“…7 Therefore, in the last few years, the consideration has been given by many researchers and scientists to examine the friction and wear responses of PAOs with different nanoparticles as an additive under various operating parameters namely, sliding distance, applied load, velocity and temperature. 3,[8][9][10][11][12][13][14][15] It is reported that MWCNTs are effective in many tribological applications by their distinctive structure, high flexural and tensile strengths and high elastic modulus. [16][17][18][19][20] The hollow core carbon nanotubes are slippery and facilitate for rotating action relative to each other because of such action, MWCNTs forms close to optimal nano bearing.…”