Friction behaviors and wear mechanisms of multi-filler reinforced epoxy composites under dry and wet conditions: Effects of loads, sliding speeds, temperatures, water lubrication
“…Generally, acid-aged reinforced samples exhibited lower CoFs compared to the unreinforced samples. The pores and voids caused by fibre pull-out during acid ageing may have facilitated more moisture/liquid intake, thus contributing to the reduced CoFs [ 33 , 46 ]. Fig.…”
“…Generally, acid-aged reinforced samples exhibited lower CoFs compared to the unreinforced samples. The pores and voids caused by fibre pull-out during acid ageing may have facilitated more moisture/liquid intake, thus contributing to the reduced CoFs [ 33 , 46 ]. Fig.…”
“…With the increase of load, the micro-bumps on the fabric surface tended to atten and the contact between fabric surface and plate changed from elastic or viscoelastic state to plastic or viscoplastic state. Thus, the elastic resistance decreased, resulting in a reduction of the COFs (Tian et al 2023). At different loads, COFs of modi ed fabrics were signi cantly lower than the untreated fabric, and stayed stable after 7N, which indicated that the hydration layer formed on the fabric surface could bear huge loads.…”
Section: Study On the Lubrication Properties Of Modi Ed Lyocell Fabricmentioning
Lyocell bers are currently claimed as green ber with a good application prospect, but the major problem of brillation restricts the further promotion and application. In this study, based on the theory of hydration lubrication at the solid/liquid interface, hexamethylene-diisocyanate trimer (HDIt), polyethylene glycol (PEG), and butanone oxime (MEKO) were used to synthesize a reactive hydrophilic triblock polyurethane (RHT-PU). RHT-PU could construct a water lubrication layer on the lyocell ber surface via hydrogen bonding between polyoxyethylene ether and water molecular, reducing the coe cient of friction (COF) of the ber interface in the water. It was found that PEG molecular weight and grafting density had signi cant dependence on the COF of modi ed fabrics, COFs decreased with the increase of PEG molecular weight and grafting density. In water, the COFs of fabrics modi ed by RHT-PU were reduced from 0.45 to 0.32 and maintained lower COF at higher temperature and higher normal loads. After mechanical friction and household washing test, the surface abrasion of modi ed fabrics were signi cantly improved, and color fading grade of fabrics raised from 3 grade to 4-5 grade. Construction of water lubricated interfaces effectively reduced the brillation.
“…The primary wear processes identified based on the surface morphology of the worn specimens include adhesive wear, abrasive wear, delamination wear, fretting wear, and fatigue wear mechanisms [57,58]. Following the wear test, a portion of the polymer material was discovered attached to the revolving metal disc, indicating the existence of adhesive wear [59].…”
Additive manufacturing has witnessed an upward trend in utilization across diverse industries in recent years. This study examines the tribological properties of polymer composites produced using additive manufacturing. The polymer composites were produced using the fusion deposition modeling process. Subsequently, they undergo thermal spray coating and spin coating processes that deposit hafnium carbide particles onto their surface. The wear test studies were conducted at three distinct temperature levels in accordance with the ASTM standard procedure. The findings demonstrated that the application of a ceramic particle coating led to a substantial decrease in the specific wear rates. Additionally, there were observed differences in the wear rates depending on the specific methods used for applying the coating. The application of thermal coating shown high efficacy in reducing wear rates and safeguarding the underlying materials against material loss. The uncoated PLA-CF material showed a slightly significant amount of material degradation as the test chamber temperature increased, in comparison to the coated specimens. The average specific wear rate of the thermally coated PLA-CF specimen at a temperature of 70˚C is 0.000156 kg/Nm.
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