The Use of Silver in Self-Lubricating Coatings for Extreme Temperatures

Sliney, Harold E.

doi:10.1080/05698198608981698

Cited by 96 publications

(36 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Recently, YSZ-Ag-Mo nanocomposite coatings were produced by a hybrid process of magnetron sputtering and pulsed laser depositions [10,11]. Silver is an effective lubricant at moderately high temperatures [26][27][28][29][30][31], and molybdenum-based compounds are lubricious at higher temperatures in air, as shown by other researchers [32][33][34][35][36]. The YSZ-Ag-Mo coatings provided lubrication by forming a silver rich surface at 300-500°C and by oxide formation in friction contact at above 500°C.…”

Section: Introductionmentioning

confidence: 96%

Silver diffusion and high-temperature lubrication mechanisms of YSZ–Ag–Mo based nanocomposite coatings

Muratore

Voevodin

2007

Composites Science and Technology

145

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 96%

Silver diffusion and high-temperature lubrication mechanisms of YSZ–Ag–Mo based nanocomposite coatings

Muratore

Voevodin

2007

Composites Science and Technology

145

View full text Add to dashboard Cite

“…Recent in-situ TEM studies of YSZ-Au nanocomposites during heating showed that the noble metal diffusion process is accompanied by coalescence at the surface [10]. From work on powder-based and other types of composites, it is known that silver is an effective lubricant up to moderately high temperatures [11][12][13][14][15][16]. YSZ-Mo composites showed moderately low friction above 500°C [9] due to the formation of lubricious molybdenum-based compounds at high-temperature in air, similar to that shown by other researchers [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 98%

Multilayered YSZ–Ag–Mo/TiN adaptive tribological nanocomposite coatings

Muratore

Voevodin

et al. 2006

Tribol Lett

View full text Add to dashboard Cite

Adaptive nanocomposite coatings provide low friction in broad ranges of environmental conditions through the formation of lubricious surfaces resulting from interactions with the ambient atmosphere. Designing adaptive coatings to withstand wear through repeated thermal cycles is particularly difficult since most demonstrate irreversible changes in surface composition and morphology. This permanent change in the condition of the surface limits the utility of adaptive coatings in applications where thermal cycling is expected. Moreover, some lubrication mechanisms occur over the entire coating surface in addition to the area experiencing wear, which results in a significant waste of lubricant. In an effort to increase the wear lifetime and move toward thermal cycling capabilities of solid adaptive lubricants, a multilayer coating architecture incorporating two layers of adaptive YSZ-Ag-Mo nanocomposite lubricant separated by a TiN diffusion barrier was produced. The multilayer coating lasted over five times longer than a monolithic adaptive coating of identical composition and total thickness for dry sliding tests at 500°C in air. Analysis of the structure and composition of the films after heating suggests directed, lateral diffusion of lubricant beneath the diffusion barrier toward the wear scar as a mechanism for the increased wear life of the multilayer coating.

show abstract

“…A new class of coatings has been created with the incorporation of dry lubricants particles as MoS 2 , forming composite coatings so-called self-lubricating coatings 6 . These coatings allow increasing the lifetime of tools and machines where liquid lubricants cannot be used.…”

Section: Introductionmentioning

confidence: 99%

Laser Cladding of Fe-based Metallic Glass/MoS2 Self-lubricating Composites: Effect of Power and Scanning Speed

Giroto

Gargarella

Riva³

et al. 2018

Mat. Res.

View full text Add to dashboard Cite

MoS 2 powder has been used to form "self-lubricating" composite coatings, which are very useful to increase the lifetime of machines where liquid lubricants cannot be used. In this work, amorphous overspray powder of Fe 60 Cr 8 Nb 8 B 24 (at%) alloy was mixed with 5wt.% MoS 2 powder and it was used to produce single tracks on AISI 1020 steel substrates by laser cladding. The tracks were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Vickers microhardness. It was observed α-Fe, an Nb-rich intermetallic and MoS 2 particles in the tracks, regardless of laser parameter used. DSC analyses proved the presence of amorphous phase for samples produced with parameters 200W/33.3mm/s, 600W/100mm/s, 800W/100mm/s and 800W/150mm/s. The tracks produced with larger power (800W) and higher scanning speeds (100 and 150mm/s) exhibited a better integrity and homogeneity, lower dilution and presence of amorphous phase, being these parameters considered the most appropriate to produce composite coatings of Fe 60 Cr 8 Nb 8 B 24 (at%)/5wt% MoS 2 containing amorphous phase. Hardness tests showed that the single tracks produced are harder than the substrate, for example, the track produced with 800W/150mm/s exhibits hardness six times higher than the steel substrate, 1200 HV 0.3 and 200 HV 0.3 , respectively.

show abstract

The Use of Silver in Self-Lubricating Coatings for Extreme Temperatures

Cited by 96 publications

References 6 publications

Silver diffusion and high-temperature lubrication mechanisms of YSZ–Ag–Mo based nanocomposite coatings

Silver diffusion and high-temperature lubrication mechanisms of YSZ–Ag–Mo based nanocomposite coatings

Multilayered YSZ–Ag–Mo/TiN adaptive tribological nanocomposite coatings

Laser Cladding of Fe-based Metallic Glass/MoS2 Self-lubricating Composites: Effect of Power and Scanning Speed

Contact Info

Product

Resources

About