Micro-scale sliding contacts on Au and Au-MoS2 coatings

Stoyanov, Pantcho; Chromik, Richard R.; Gupta, Sagar V.; Lince, Jeffrey R.

doi:10.1016/j.surfcoat.2010.07.026

Cited by 24 publications

(24 citation statements)

References 26 publications

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“…However, their microtribological performance is not nearly as well studied. Previous research has been performed using an atomic force microscope (AFM) [8] and a nanoindentation instrument [32,33] to investigate the influence of the gold content on the microtribological properties of MoS 2 . It has been shown that higher gold content (i.e.…”

Section: Introductionmentioning

confidence: 99%

Microtribological Performance of Au–MoS2 and Ti–MoS2 Coatings with Varying Contact Pressure

et al. 2010

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Solid lubricant coatings with co-sputtered metal and MoS 2 have shown favorable macrotribological properties at a wide range of contact stresses and humidity levels. These materials are also candidates for use in microcontacts and micro-electromechanical systems (MEMS), but their performance at this scale is poorly understood. For this study, microtribological properties of Au-MoS 2 and Ti-MoS 2 coatings, with varying metal additives of less than 15 at%, were examined using a nanoindentation instrument. Titanium and gold were chosen for this study as metal additives due to their different influence on the mechanical properties of the coating. The hardness and reduced modulus of the coatings increased with the addition of metal, when compared to pure MoS 2 . Reciprocating microscratch tests were performed with two spherical diamond tips (50 and 10 lm radii) in dry air. A range of normal loads were used between 0.2 and 5.0 mN. Friction and wear measurements were analyzed with respect to the variation in the contact pressure and compared to literature studies performed at the macroscale. Correlations were found between the coating mechanical properties, tip-coating adhesion, interfacial shear strength, and the formation of transfer films and tribofilms.

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Section: Introductionmentioning

confidence: 99%

Microtribological Performance of Au–MoS2 and Ti–MoS2 Coatings with Varying Contact Pressure

et al. 2010

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“…However, due to deviation in the Hertzian contact behaviour at the microscale [21,22], the pressure P is calculated using the real contact area of the tip. The contact area can be obtained from the area function of the tip (i.e., obtained from the AFM characterization) and the elastic depth at the end of the sliding test.…”

Section: Techniques In Micro-/nanotribologymentioning

confidence: 99%

“…Surface adhesion effects on microtribological properties (i.e., friction and wear) have also been reported for thin solid films [ 21 , 22 ]. For instance, the co-sputtering of metals with MoS 2 resulted in lower pull-off forces compared to pure MoS 2 , which correlated with improved tribological properties (i.e., lower friction and higher wear resistance).…”

Section: What Is Microtribology?mentioning

confidence: 99%

Scaling Effects on Materials Tribology: From Macro to Micro Scale

Stoyanov

Chromik

2017

Materials

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The tribological study of materials inherently involves the interaction of surface asperities at the micro to nanoscopic length scales. This is the case for large scale engineering applications with sliding contacts, where the real area of contact is made up of small contacting asperities that make up only a fraction of the apparent area of contact. This is why researchers have sought to create idealized experiments of single asperity contacts in the field of nanotribology. At the same time, small scale engineering structures known as micro- and nano-electromechanical systems (MEMS and NEMS) have been developed, where the apparent area of contact approaches the length scale of the asperities, meaning the real area of contact for these devices may be only a few asperities. This is essentially the field of microtribology, where the contact size and/or forces involved have pushed the nature of the interaction between two surfaces towards the regime where the scale of the interaction approaches that of the natural length scale of the features on the surface. This paper provides a review of microtribology with the purpose to understand how tribological processes are different at the smaller length scales compared to macrotribology. Studies of the interfacial phenomena at the macroscopic length scales (e.g., using in situ tribometry) will be discussed and correlated with new findings and methodologies at the micro-length scale.

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“…For this study (couple Gold/aluminum) a coefficient of 0.25 was used. [3][4][5] The insertion of a 4µm (diameter) tube into a 7µm (diameter) pad is simulated. Figure 5 shows the element view of the model.…”

Section: Fig 4: Schematic Axisymmetric Model Of the Single Micro Tubmentioning

confidence: 99%

Micro-tube insertion into aluminum pads: Simulation and experimental validations

Bedoin

Brugiere²,

Marion³

et al. 2013

Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT)

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Following the trend towards more densely integrated electronic devices; new flip-chip technologies are developed to address very fine pitch interconnection. Among them, it was demonstrated that the hybridization technique based on insertion of gold coated micro-tubes into aluminum pads (Al-0.5Cu) has the capability for a 10µm bonding pitch and the advantage of a room temperature assembly process.In this study, we propose to thoroughly study the electromechanical behavior of the micro-tube inserted into an aluminum pad.

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Micro-scale sliding contacts on Au and Au-MoS2 coatings

Cited by 24 publications

References 26 publications

Microtribological Performance of Au–MoS2 and Ti–MoS2 Coatings with Varying Contact Pressure

Microtribological Performance of Au–MoS2 and Ti–MoS2 Coatings with Varying Contact Pressure

Scaling Effects on Materials Tribology: From Macro to Micro Scale

Micro-tube insertion into aluminum pads: Simulation and experimental validations

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