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The elevated temperature can cause serious failure of electrical contact. The fretting wear behavior of two typical materials (aluminum and silver) and contacts at elevated temperatures (from RT to 300°C) and normal loads (10N) is addressed in this paper. The morphology and wear surface was analyses by 3D profile and SEM. The results show that elevated temperature significantly affected the contact...
Fretting of silver coated electrical contacts has been studied in a crossed cylinder contact model setup at varying displacement amplitude. The contacts have been tested dry (unlubricated) and lubricated with lithium complex (LiX) and polypropylene (PP) thickened greases. The same polyalphaolefin (PAO) base oil blend was used, hence the thickener is the only difference between the greases. At low...
To investigate the wear mechanism and microstructural evolution of Ti6Al4V titanium alloy under the condition of dual rotary fretting (DRF), which mainly exists in the interfaces of ball-and-socket joints with the motion combing torsional fretting with rotational fretting. Using the Ti6Al4V titanium alloy flat specimen against the 52100 steel ball to investigate the DRF and damage behavior were carried...
HS25 cobalt-based superalloy was investigated between 100 and 600°C under fretting wear (small amplitude reciprocating displacements) in a cross-cylinder contact. Tribological behavior was compared to pure cobalt, chromium and nickel tested under the same conditions and analyzed in terms of friction, wear, interface morphology and chemical composition by SEM-EDX and Raman spectroscopy. On HS25, the...
Fretting experiments of Incoloy 800 steam generator tubes against AISI 304, AISI 1060 and Cu (99.9%) cylindrical pads were carried out to evaluate the influence of pad composition on wear damage and on the nature of the triboparticles originated in the process. Tests were performed up to 106 cycles in air under an imposed relative displacement amplitude of 75 ± 5µm and a normal contact load of 40...
Fretting wear of nickel-aluminum bronze (NAB) alloys and 15wt% Ti3SiC2/NAB composites against the 42CrMo4 steel was studied through flat-on-flat testing at oil-lubrication conditions with varying free-water contents (0, 26.8, 52.3 and 76.7wt%). Tribological test results revealed that the addition of Ti3SiC2 substantially reduced the fretting wear and the friction coefficient of NAB alloys at all testing...
The third body formed in a contact between HS25 cobalt-based superalloy versus ceramic under fretting wear (small reciprocating displacements) was investigated. This tribomaterial, commonly called “glaze layer”, was created from nanosized, compacted and sintered wear debris and adheres on both rubbed parts. The glaze layer was investigated both from tribological and rheological points of view. In...
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