Self-Lubricating Bearings: Microstructural and Dimensional Evolution under Industrial Processing Conditions

Justino, Júnior Gervásio; Bernardini, P.A.N.

doi:10.4028/www.scientific.net/msf.299-300.356

Cited by 5 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In these operating conditions, radial bearing materials are widely used at low rotational speeds and high loads. In experimental studies, at 820 MPa, where the production pressure of composite material is high, this behavior has been observed as a linear decrease in the friction coefficient at different mixing ratios with advancing sliding distances, and is consistent with previous studies [8,34,35].…”

Section: Resultssupporting

confidence: 90%

“…The reason for this situation is that the eroded particles showed abrasive wear behavior in the wear area and caused deformations on the composite material surfaces [34]. In composite materials with reinforcement material, the lubrication regime formed in the advancing processes of wear prevented such situations thanks to the spheroidal graphite in the reinforcement material GGG40 [35]. In addition, when the friction coefficient curves of the composite materials produced at two different temperatures were examined, it was seen that the curves of the composite materials produced at 450 • C were more similar to each other.…”

Section: Resultsmentioning

confidence: 99%

“…In self-lubricating bearing materials, when the bearing material heats during operation, the lubrication task is performed in the lubricating fluid contact areas from the pores. On cooling after wear, this lubricating fluid is directed back to the pores of the bearing material [15,35]. In these operating conditions, radial bearing materials are widely used at low rotational speeds and high loads.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Friction Coefficient Changes in Recycled Composite Materials under Constant Load

Güneş,

Düzcükoğlu,

Salur

et al. 2023

Lubricants

View full text Add to dashboard Cite

The surface quality of machine elements may deteriorate over time while operating under different conditions. This deterioration adversely affects the wear behavior in the contact areas, and these materials become unusable over time. In machine elements especially, the heat transfer, wear amount and surface roughness parameters in the contact area are very important in order for the system to work efficiently. In order to understand this change, composite materials were produced by adding spheroidal graphite cast iron (GGG40) with high lubricating properties at different rates to bronze (CuSn10), which is widely used as a self-lubricating bearing material. In this study, four different mixing ratios (B60D40, B70D30, B80D20 and B90D10) and B100, which is completely produced from bronze chips, were used for comparison purposes. In addition, these produced composite materials were compared with pure CuSn10 and pure GGG40 via double-acting isostatic hot pressing, and then the results were examined. The composite materials were made at two different temperatures (400 °C and 450 °C) and three different pressures (480 MPa, 640 MPa and 820 MPa) using recycled waste chips. Composites produced by recycling waste chips both reduce costs and make a positive contribution to the natural environment. Thus, more advantageous self-lubricating bearing materials will be produced, and the efficiency will be increased in these materials. The time-dependent variation in the friction coefficient observed after the wear tests performed under constant load is explained, and the resulting surface structures are presented with SEM images and EDS analyses. After the wear tests, it was observed that the process parameters used in production effectively influenced the wear behavior. In particular, when the production pressure was low (480 MPa), the wear behavior was adversely affected because sufficient bonding between the chips could not be achieved. In addition, as the amount of GGG40 used as a reinforcement material increased, the spheroidal graphite contained in it positively affected the wear behavior. The lubricating effect provided by this spheroidal graphite reduced wear in the contact area and the friction coefficient.

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Friction Coefficient Changes in Recycled Composite Materials under Constant Load

Güneş,

Düzcükoğlu,

Salur

et al. 2023

Lubricants

View full text Add to dashboard Cite

show abstract

“…Graphite addition increases density and decreases wear. 15,16 Since pressure and velocity affect adhesive wear, bearings wear must have suitable PV values. 5 In this study, tribological and mechanical properties of copper based CuSn10, ferrous based Fe-graphite and copperzferrous based CuSnFe-graphite bearings manufactured by PM method have been determined and compared.…”

Section: Introductionmentioning

confidence: 99%

“…With increasing pressure density, porosity decreases in these bearings, resulting in less oil impregnation. Graphite addition increases density and decreases wear 15,16. Since pressure and velocity affect adhesive wear, bearings wear must have suitable PV values 5…”

Section: Introductionmentioning

confidence: 99%

Tribological and mechanical properties of PM journal bearings

Ünlü

2011

Powder Metallurgy

View full text Add to dashboard Cite

Powder materials are widely used in journal bearings since they provide a good tribological performance with journal bearings. These bearings are self-lubricated and can be used in places where no lubricating is possible. In this study, tribological and mechanical properties of copper based CuSn10, ferrous based Fe-graphite and copperzferrous based CuSnFe-graphite bearings manufactured by powder metallurgy method have been determined and compared. Wear tests were carried out at 20 N load and 1500 rev min 21 every 30 min for 2?5 h using radial journal bearing wear test rig. Hardness, tensile, compressive, bending and radial fracture mechanical tests of these bearing materials were carried out. As a result, tribological and mechanical properties improved in CuSnFe-C bearings.

show abstract

Effect of boronizing and shot peening in ferrous based FeCu–Graphite powder metallurgy material on wear, microstructure and mechanical properties

Yılmaz¹,

Ünlü²,

Varol³

2010

Materials & Design

View full text Add to dashboard Cite

Self-Lubricating Bearings: Microstructural and Dimensional Evolution under Industrial Processing Conditions

Cited by 5 publications

References 0 publications

Investigation of Friction Coefficient Changes in Recycled Composite Materials under Constant Load

Investigation of Friction Coefficient Changes in Recycled Composite Materials under Constant Load

Tribological and mechanical properties of PM journal bearings

Effect of boronizing and shot peening in ferrous based FeCu–Graphite powder metallurgy material on wear, microstructure and mechanical properties

Contact Info

Product

Resources

About