Tribological Behavior of Film Forming Organosilane/-Siloxane Oil Additives: Film Characterization and Influences on Lubrication

Juretzka, Benjamin; Wieber, Stephan; Wilkens, Roland; Hagemann, Michael; Kolb, R. E.; Riedel, Ralf

doi:10.1007/s11249-019-1241-0

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…The tribological performance of PPMs could be affected by many factors [5][6][7][8][9][10][11], such as speed, load, oil viscosity, surface tension, pore diameter, porosity, the type and amount of additives. So far, however, researches related to PPMs have mainly focused on their preparation, the influences of internal solid and/ or oil lubricants on their tribological behaviors [12][13][14][15][16]. There are only few published papers concerning the friction mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effect of Porosity on the Friction Properties of Porous Polyimide Impregnated with Poly-α-Olefin in Different Lubrication Regimes

et al. 2020

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Porous polyimide materials (PPIs) having different porosity with a constant pore size were fabricated to further understand the effect of porosity on the friction properties in the boundary lubrication, mixed lubrication and elastohydrodynamic lubrication (EHL) regime, respectively. The tribological behaviors of non-porous polyimide (PI0) immersed in poly-α-olefin oil bath and PPIs impregnated with poly-α-olefin were firstly compared, and the effects of load and porosity on the friction performances were investigated. Results show that as the speed increases, the PPIs impregnated with oil exhibit the same friction coefficient (COF) change trend as PI0 immersed in poly-α-olefin oil, which is consistent with the stribeck curve, but the COFs in whole velocity range are higher, and the EHL arrived at a higher speed. The EHL critical speed of PPIs impregnated with oil, as well as the COFs during whole lubricating regime are closely related to the load and the porosity of the material. It mainly depends on two opposite effects of porosity on the friction properties. On one hand, PPIs with higher porosity will release more oil from pores under compression to form a lubricating film, on the other hand, higher porosity will lead to higher contact pressure under the same load, and provide larger contact areas as a result of the increase in the elastic collapse area, which will aggravate the solid-solid direct rubbing and increase the COFs.

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