Effect of Ca[F.sub.2] surface layers on the friction behavior of copper-based composite

• Published in: Powder metallurgy and metal ceramics Vol. 51; no. 5-6; p. 363
• Main Authors: Konopka, K, Roik, T.A, Gavrish, A.P, Vitsuk, Yu. Yu, Mazan, T
• Format: Journal Article
• Language: English
• Published: Springer 01-09-2012
• Subjects: Lubricants industry; Lubrication and lubricants
• ISSN: 1068-1302

The paper studies the effect of the process parameters for the production of new copper-based bearing composite materials doped with nickel and molybdenum, with Ca[F.sub.2] additions (DN5M3KF9) as a solid lubricant, on the structurization and tribotechnical properties at high-speed friction (bearings perform at a sliding speed of 6 m/sec and a pressure up to 38.5 MPa in air). The study focuses on the distribution of Ca[F.sub.2] in the composite with a Cu-Ni-Mo matrix, its role in self-lubrication of the material, and the behavior of Ca[F.sub.2] in the friction area under extreme operating conditions. It is shown that the solid lubricant is evenly distributed over the contact surfaces as it piles up over the entire friction area during high-speed friction. It is established that the tribofilms formed in the presence of the Ca[F.sub.2] solid lubricant provide high wear resistance of copper-based materials. Keywords: high-speed bearings, solid lubricant, copper, process parameters, operating conditions, friction films, wear resistance.