Investigation on tribo-layers and their function of a titanium alloy during dry sliding

Zhang, Q.Y.; Zhou, Yuhua; Wang, L.; Cui, Xianghong; Wang, S.Q.

doi:10.1016/j.triboint.2015.10.018

Cited by 59 publications

(27 citation statements)

References 39 publications

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“…As discussed before, the continuous oxide layers (the corresponding continuous dark regions) formed in AM with the smoothest wear scar, which accounts for the lower wear rate. The formation of a tribo-layer, as a protective and lubricating layer [24], can effectively reduce the direct contact of the sample and the Si3N4 ball. It has been illustrated that the oxidation wear dominates the wear processing of the coimplanted GH4169 alloy [25].…”

Section: Friction and Wear Propertiesmentioning

confidence: 99%

Friction and Wear Behavior of an Ag–Mo Co-Implanted GH4169 Alloy via Ion-Beam-Assisted Bombardment

et al. 2017

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Ag, Mo, and Ag-Mo were respectively implanted into GH4169 alloy substrates without heating via ion-beam-assisted bombardment technology (IBAB). In addition, the wear performance under low sliding speed and applied load were researched at room temperature (RT). A small amount silver molybdate phase could be detected on the surface of the co-implanted GH4169 alloy bombarded by a high-energy ion beam. The average friction coefficients under the steady wear state had almost no change at all. Compared with the un-implanted GH4169 alloys, the wear rate of the GH4169 alloys with co-implantation of Ag and Mo was reduced by 75%. A large amount of the silver molybdate phase could be generated due to the tribo-reaction on the worn surface during sliding. It benefits the formation of continuous oxide layers as lubrication and protected layers, leading to the change in the predominant wear mechanism from abrasion and adhesion wear to oxidation wear.

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Section: Friction and Wear Propertiesmentioning

confidence: 99%

Friction and Wear Behavior of an Ag–Mo Co-Implanted GH4169 Alloy via Ion-Beam-Assisted Bombardment

et al. 2017

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“…This may be owning to the formation of a tribo-layer that avoids the direct metal-metal contact between the asperities of the steel ball and the asperities of the Ti64 sample, thereby preventing further wear through sliding. The tribo-layer is commonly formed on a metal surface when rubbed by a counterface during a sliding wear test [28]. In order to further explore the wear characteristics and mechanisms of the EBM-built and as-cast Ti64, it is first necessary to delineate the terms of the non-oxide tribo-layer and tribo-oxide layer.…”

Section: Dry Sliding Wear Behaviourmentioning

confidence: 99%

“…In the case of non-oxide tribo-layer, it merely refers to the oxides that could not be identified by XRD and are not completely absent of an oxide on the Ti64 sample surface. On the other hand, the tribo-oxide layer refers to the formation of a strong and compact oxide layer during sliding process that serves as a protection to the worn surface [28][29][30]. Inherently, in an EBM process where the built condition is under high vacuum environment, the thickness of surface oxide layer only ranges from 5 to 7 nm [31].…”

Section: Dry Sliding Wear Behaviourmentioning

confidence: 99%

Microstructure and Wear Properties of Electron Beam Melted Ti-6Al-4V Parts: A Comparison Study against As-Cast Form

Toh

Wang

Tan

et al. 2016

Metals

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Ti-6Al-4V (Ti64) parts of varying thicknesses were additively manufactured (AM) by the powder-bed-based electron beam melting (EBM) technique. Microstructure and wear properties of these EBM-built Ti-6Al-4V parts have been investigated in comparison with conventionally cast Ti64 samples. Sliding wear tests were conducted using a ball-on-disc micro-tribometer under ambient conditions. Experimental results reveal that EBM-built Ti64 samples exhibited higher microhardness and an overall larger coefficient of friction as compared to the as-cast counterpart. Of interest is that the corresponding specific wear volumes were lower for EBM-built Ti64 samples, while the as-cast Ti64 showed the poorest wear resistance despite its lower coefficient of friction. Wear mechanisms were provided in terms of quantitative microstructural characterization and detailed analysis on coefficient of friction (COF) curves.

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“…Although, at temperatures above 600 °C tribo-oxides can play a protective role [46], since machining in this study was performed at temparatures below 300 °C, it is most probably the formation of greater amounts of Ti-O tribo-phase in sample c causes a poor wear performance (more intensive sticking of Al on the rake face) than found in sample b. …”

Section: Xps Analysismentioning

confidence: 82%

“…Coatings 2017, 7,149 It is considered that this tribo-oxide is not adherent to the substrate, is also brittle and tends to be fragmented, and therefore does not have any protective role during machining [46,47]. Although, at temperatures above 600 °C tribo-oxides can play a protective role [46], since machining in this study was performed at temparatures below 300 °C, it is most probably the formation of greater amounts of Ti-O tribo-phase in sample c causes a poor wear performance (more intensive sticking of Al on the rake face) than found in sample b.…”

Section: Xps Analysismentioning

confidence: 99%

Hybrid Ti-MoS2 Coatings for Dry Machining of Aluminium Alloys

et al. 2017

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Combinatorial deposition, comprising filtered cathodic vacuum arc (FCVA) and physical vapor deposition (PVD) magnetron sputtering is employed to deposit molybdenum disulphide (MoS 2 ) and titanium (Ti) thin films onto TiB 2 -coated tool inserts specifically designed for the dry machining of aluminium alloys. Titanium is deposited by FCVA while MoS 2 is magnetron sputtered. The deposition set up allows several compositions of Ti-MoS 2 to be deposited simultaneously, with Ti content ranging between 5 and 96 at. %, and their machining performances to be evaluated. Milling took place using a CNC Vertical Machining Center at a 877 mm/min feed rate. The effect of different coating compositional ratios on the degree of aluminium sticking when a milling insert is used to face mill an Al alloy (SAE 6061) was investigated using a combination of energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) analysis. XPS studies suggest that the greater degree of Al sticking on the rake face of the inserts is due to the formation of greater amounts of non-protective Ti-O phases. EDX mapping of the milling inserts after machining reveal that a Ti:MoS 2 ratio of around 0.39 prevents Al from sticking to the tool edges. Since we prevent Al from sticking to the tool surface, the resultant machined surface finish is improved thus validating the machining performance of TiB 2 -coated tools using optimum compositions of Ti:MoS 2 thin film coatings.

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Investigation on tribo-layers and their function of a titanium alloy during dry sliding

Cited by 59 publications

References 39 publications

Friction and Wear Behavior of an Ag–Mo Co-Implanted GH4169 Alloy via Ion-Beam-Assisted Bombardment

Friction and Wear Behavior of an Ag–Mo Co-Implanted GH4169 Alloy via Ion-Beam-Assisted Bombardment

Microstructure and Wear Properties of Electron Beam Melted Ti-6Al-4V Parts: A Comparison Study against As-Cast Form

Hybrid Ti-MoS2 Coatings for Dry Machining of Aluminium Alloys

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