Effect of CaF2 Surface Layers on the Friction Behavior of Copper-Based Composite

K.Konopka,
 
T.A.Roik,
 
A.P.Gavrish,
 
Yu.Yu.Vitsuk,
 
T.Mazan
 

Powder Metallurgy - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #05/06
http://www.materials.kiev.ua/article/1045

Abstract

The paper studies the effect of process parameters in the production of new composite materials for copper-based bearings doped with nickel and molybdenum, with addition of calcium fluoride CaF2 (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 loads up to 38.5 MPa in air). The study focuses on CaF2 distribution in the composite with a Cu–Ni–Мо matrix, its role in self-lubrication of the material, and behavior in the friction area under extreme operating conditions. It is shown that the solid lubricant is evenly distributed on contact surfaces as it piles up over the entire friction area at high-speed friction of the materials. It is determined that the friction films formed with the CaF2 solid lubricant promote high wear resistance of copper-based materials.


COPPER, FRICTION FILMS, HIGH-SPEED BEARINGS, OPERATING CONDITIONS, PROCESS PARAMETERS, SOLID LUBRICANT, WEAR RESISTANCE