Investigation of material transfer in sliding friction-topography or surface chemistry?

Westlund, Viktoria; Heinrichs, Jannica; Olsson, Mikael; Jacobson, Staffan

doi:10.1016/j.triboint.2016.01.022

Cited by 20 publications

(5 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, AFM has been widely applied for measurement of sample morphology and atomic forces, especially longitudinal forces. While friction force and frictional properties of samples were previously measured by other methods, AFM was commonly used to characterize thickness, morphology [ 15 , 16 , 17 ], roughness [ 15 , 18 , 19 , 20 ] and surface characterization. As a useful tool, AFM is increasingly being used to measure the interaction forces between samples and recognition events between proteins at the single molecule level.…”

Section: Introductionmentioning

confidence: 99%

Friction Determination by Atomic Force Microscopy in Field of Biochemical Science

Wang

2018

Micromachines

View full text Add to dashboard Cite

Atomic force microscopy (AFM) is an analytical nanotechnology in friction determination between microscale and nanoscale surfaces. AFM has advantages in mechanical measurement, including high sensitivity, resolution, accuracy, and simplicity of operation. This paper will introduce the principles of mechanical measurement by using AFM and reviewing the progress of AFM methods in determining frictions in the field of biochemical science over the past decade. While three friction measurement assays—friction morphology, friction curve and friction process in experimental cases—are mainly introduced, important advances of technology, facilitating future development of AFM are also discussed. In addition to the principles and advances, the authors also give an overview of the shortcomings and restrictions of current AFM methods, and propose potential directions of AFM techniques by combining it with other well-established characterization techniques. AFM methods are expected to see an increase in development and attract wide attention in scientific research.

show abstract

Section: Introductionmentioning

confidence: 99%

Friction Determination by Atomic Force Microscopy in Field of Biochemical Science

Wang

2018

Micromachines

View full text Add to dashboard Cite

show abstract

“…Some typical research achievements have shed light on understanding of certain causing mechanisms and preventive measures of galling. Westlund et al [2] discussed the influence of mould surface chemistry and the strong influence from nanotopography of an unpolished diamond-like carbon (DLC)coated surface on coefficient of friction and material transfer. Typically, Hosseini and Ahmadi [3] were able to confirm the existence of four regions using the structural characterisation of PVD(TiN) coating for improving its tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Developing of galling during the forming and its improvement by physical vapour depositing

Zhou

Gao

Zheng

et al. 2018

Surface Engineering

View full text Add to dashboard Cite

In sheet metal stamping, galling is initiated and developed aggressively at the mould radius, where sheet metal undergoes large plastic deformation. This study sheds light on correlating the level of sheet plastic deformation with galling initiation on the mould surface. The 3D topography facilitated the observation of galling evolution process on the surface of quenched/tempered mould. The observation on the sliding sheet counterpart showed that with larger plastic deformation, zinc-coated surface tended to become rough and a large number of intermittent micro-cracks formed, leading to earlier initiation of galling. Furthermore, the surface of mould was treated by physical vapour depositing (PVD) of CrN. In the specific sliding tests under the same level of plastic deformation, critical total slid distance at which galling initiated was increased significantly. The major factor causing galling initiation on the PVD(CrN)-coated mould was identified.

show abstract

“…Aiming to investigate the very first sliding contact, and thus also the initial stages of material transfer between tool steels and softer metals, a series of micro-scale sliding tests have been performed in situ in the SEM [14][15][16][17][18]. The softer metals were selected based on that they are known to cause galling problems.…”

Section: Introductionmentioning

confidence: 99%

“…The present study has employed the same in situ equipment and similar test design as in [14][15][16][17][18], but now complemented by corresponding tests made outside the SEM chamber, in air. To retain the ability of precision positioning of the sliding tip and some in situ observation capacity of surface damage and transfer, the tests in air were run while observed using a light optical microscope.…”

Section: Introductionmentioning

confidence: 99%

On the Role of Material Transfer in Friction Between Metals: Initial Phenomena and Effects of Roughness and Boundary Lubrication in Sliding Between Aluminium and Tool Steels

2018

View full text Add to dashboard Cite

In the absence of a lubricant, the friction we measure in sliding contact between metals is typically high and quite erratic, with rapid fluctuations. If we filter out these rapid fluctuations, we can typically also notice slower trends, which can lead to quite dramatic friction changes. Unless careful studies are performed, the cause to this behaviour cannot be understood. How come a material couple cannot be characterised with a specific coefficient of friction? The present paper sets out to add understanding to this area, by conduction and analysing an experimental series involving sliding between a needle-like aluminium tip against tool steel flats. The load is high enough to cause substantial plastic deformation of the aluminium needle; its tip becomes formed by the contact against the tool steel. These small-scale, low sliding distance tests facilitate detailed studies of the initial stages of various friction trends, and the effects of initial surface roughness and shifts of this roughness caused by material transfer between the sliding surfaces. Specifically, the effects on the transfer and friction behaviour from presence or absence of a boundary lubricant film and atmospheric oxygen were studied. It was found that very smooth sliding surfaces can offer low-friction conditions for these metal types. However, the smooth sliding interface is very fragile. In all unlubricated cases tested, it very rapidly (in less than a few mm sliding) became ruined due to transfer, and the friction level correspondingly increased. The boundary lubricant could only offer low friction in cases where the flat steel surface was very smooth. The lubricant also facilitated smoothening of transferred aluminium. As long has been well known, boundary lubrication films typically do not totally hinder direct metallic contact in solid to solid contact. The present results strengthen this view and further suggests that in these direct contacts one of the major friction reducing effects of the lubricant is to efficiently limit transfer, which otherwise acts to make the sliding surface rough.

show abstract

Investigation of material transfer in sliding friction-topography or surface chemistry?

Cited by 20 publications

References 12 publications

Friction Determination by Atomic Force Microscopy in Field of Biochemical Science

Friction Determination by Atomic Force Microscopy in Field of Biochemical Science

Developing of galling during the forming and its improvement by physical vapour depositing

On the Role of Material Transfer in Friction Between Metals: Initial Phenomena and Effects of Roughness and Boundary Lubrication in Sliding Between Aluminium and Tool Steels

Contact Info

Product

Resources

About