Properties of Journal Bearing Materials That Determine Their Wear Resistance on the Example of Aluminum-Based Alloys

Abstract

Potential relations of tribological characteristics of aluminum antifriction alloys with their compositions and mechanical properties were investigated. In this regard, the properties of eight aluminum alloys containing tin from 5.4% to 11% doped with lead, copper, silicon, zinc, magnesium, and titanium were studied. Mechanical properties such as hardness, strength, relative extension, and impact strength were analyzed. Within the tribological tests seizure load and wear of material were evaluated and secondary structures were studied afterwards. The absence of a definitive correlation between tribological behavior and mechanical properties was shown. It was determined that doping tin over 6% is excessive. The seizure load of the alloys increases with the magnesium content. Secondary structures of the alloys with higher wear rates contain one order less magnesium and tin.

The conditions necessary for the formation of dissipative structures in tribo-films on friction surfaces that decrease the wear rate

“…The relatively sharp decrease of wear intensity in Figs. 1, 2, and 3 can be attributed in [44,45,47,48,49,51] to the passage of selforganization.…”

“…Attention should be paid to the signi cant differences between each system. The methods, materials, modes, and experimental conditions are described in the relevant articles [44,45,47,48,49,51].…”

“…The fundamental reason for this is that a portion of the frictional energy, which, in the absence of self-organization would have been spent on wear, is instead spent on the formation of dissipative structures in the wake of a self-organization process. This generally applies for different friction systems such as metal cutting [44][45][46], friction with current collection [47], plain bearings [48,49]. Self-organization can only occur after a friction system loses thermodynamic stability [42].…”

Bearing Aluminum-Based Alloys: Microstructure, Mechanical Characterizations, and Experiment-Based Modeling Approach

“…Materials of monometallic bearings for capacity expansion and toughness operations should exhibit good mechanical properties with good anti-friction properties [ 15 , 16 , 17 , 18 , 19 , 20 ]. Lead and tin are considered the most common alloying elements in aluminum anti-friction alloys [ 21 , 22 , 23 , 24 ]. Because of its excellent tribological performance, the Al-20%Sn-1%Cu alloy is regarded as a fundamental alloy for designing novel anti-friction materials.…”

Investigation of PEEK Lined Pads for Tilting-Pad Journal Bearings

“…Babbitt is a tin-antimony-copper alloy, has high load capacity and wear resistance but has a low melting point. Aluminum-tin lined pads provide higher load capacity than Babbitt pads due to higher temperature capability and greater fatigue resistance [14]. The content of the main alloying element, tin, varied from 5.4 to 11%.…”