Friction and wear behaviour of Fe-Cu-C based self lubricating material with CaF₂as solid lubricant

Abstract

Purpose This paper aims to investigate the effect of CaF2 (calcium fluoride) addition as a solid lubricant on the friction and wear behaviour of sintered Fe-Cu-C materials under different loads. Design/methodology/approach In this study, the effects of CaF2 added in varying weight percentages on the friction-wear properties of Fe-2Cu-0.8C alloys are investigated. Five Fe-2Cu-0.8C-based compositions comprising CaF2 in 0, 3, 6, 9 and 12 Wt.% were prepared using the single-stage compaction and sintering technique. Friction coefficient, wear loss, hardness and compressive strength of the specimens were measured. The worn-out surfaces were analysed using a scanning electron microscope. Friction and wear tests were carried out on pin-on-disc machine under dry sliding conditions at room temperature. Findings The alloy with 3 Wt.% CaF2 was found to be useful in improving wear and friction properties, whereas higher contents of CaF2 resulted in increased wear and friction. Apart from enhanced tribological properties, a slight decrease in the compressive strength was also observed in the 3-Wt.%-CaF2-added sample. Adhesion and abrasion were the prominent wear types observed during this study. Originality/value A new self-lubricating composite is developed where CaF2 is used as a solid lubricant in a Fe-Cu-C-based matrix. CaF2, being a high-temperature lubricant, is tried and tested for friction and wear at room temperature, and the results show that the addition of CaF2 in Fe-Cu-C improved its friction and wear properties. Thus, the developed material can be used for antifriction applications.

Simulation of Flat Die Deep Drawing Process by Variable Contact Pressure Sliding Model

“…The complex, multi factor experiment was realized with the presented apparatus, with numerous combinations of the tribological conditions at the contact. That implies various roughnesses of the contact surfaces of the sliding elements, various types of thin sheets and lubricants [19]- [22], with simultaneous setting of previously defined pressure dependencies P1 to P4 (Figs. 4 and 5).…”

Tribological characteristics of AA7075 composites reinforced with rice husk ash and carbonized eggshells

“…Moreover, at higher loads, oxide layer between tribo-pair gets removed, which also cause an increase in COF. 55 The retainment of oxide layer at low loads leads to decreased values of COF. The average COF was in the range of 0.179-0.265, 0.182-0.266, 0.188-0.3, 0.186-0.27, 0.184-0.265, 0.183-0.264 for composite samples V0, V1, V2, V3, V4, V5 respectively from load of 10 N to high load of 50 N.…”

Development of Technology for Manufacturing Efficient Composite Bearing Materials for High-Speed Printing Machines

“…Among antifrictional composite materials intended for severe operating conditions and incorporating solid lubricants, materials based on copper, iron, nickel, cobalt, and ceramics (Al 2 O 3 /TiC/CaF 2 , Al 2 O 3 / CaF 2 /AgO/CaF 2 ) are well known 6,7,8 .…”