Mixed friction cannot always be avoided in rolling bearings. It is therefore necessary to protect the bearings against wear. Nowadays, extreme-pressure- and anti-wear-additives fulfill this function. As these additives are harmful to the environment it was systematically examined to what extent PVD-coatings are able to take over their function. The effectiveness of the coatings was tested in the FE8 lubricant roller bearing test rig on the basis of cylindrical roller thrust bearings. With the help of this world wide established test rig the roller bearings are tested on boundary friction conditions (κ ≪ 1).
Influences of Additives on the Wear Protection of PVD-Coated and Ester Lubricated Roller Thrust Bearings
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Gold, PW, Loos, J, & Kuhn, M. "Influences of Additives on the Wear Protection of PVD-Coated and Ester Lubricated Roller Thrust Bearings." Proceedings of the World Tribology Congress III. World Tribology Congress III, Volume 2. Washington, D.C., USA. September 12–16, 2005. pp. 343-347. ASME. https://doi.org/10.1115/WTC2005-63427
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