High temperature tribological behaviors and wear mechanisms of NiAl–NbC–Ag composites formed by in-situ decomposition of AgNbO3

Feng, Xin; Lu, Cheng; Jia, Junbo; Xue, Jiali; Wang, Qihua; Sun, Yuan; Wang, Wenzhen; Yi, Gewen

doi:10.1016/j.triboint.2019.105898

Cited by 30 publications

(8 citation statements)

References 41 publications

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“…These Ag oxides, especially the lubricious binary metal oxide formed by tribo-chemical reactions in the contact area, are helpful for reducing the COF. 82 Upon sliding, the weak Ag−O bond is easy to break and allows for interlayer shearing, 83 thus contributing to the lubricating property and a smoother wear surface. On the other hand, these metal oxides are more easily formed on the surface provided that the supply of Ag is sufficient (e.g., in the multilayer with a larger thickness of the Ag layer).…”

Section: Resultsmentioning

confidence: 99%

“…When h increases from 2.5 to 20 nm, the calculated ratio between the peak for Ag in its oxidation state over the peak for it in the metallic state increases, indicating an increase in the content of Ag oxides. These Ag oxides, especially the lubricious binary metal oxide formed by tribo-chemical reactions in the contact area, are helpful for reducing the COF . Upon sliding, the weak Ag–O bond is easy to break and allows for interlayer shearing, thus contributing to the lubricating property and a smoother wear surface.…”

Section: Resultsmentioning

confidence: 99%

“…Wear rate reduction ratio of self-lubricating composite films reported in the literature as a function of the COF reduction ratio. Data of these Ag-containing self-lubricating films are chosen from refs − , , , , , and .…”

Section: Resultsmentioning

confidence: 99%

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Design and Characterization of Self-Lubricating Refractory High Entropy Alloy-Based Multilayered Films

Luo

Zhou

et al. 2021

ACS Appl. Mater. Interfaces

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Refractory high entropy alloys (RHEAs) have been proven to have excellent mechanical properties with a potential use as protective thin films. However, the combination of high hardness with low friction and wear is a major challenge in the design of RHEA films. In this study, we show that NbMoWTa/Ag self-lubricating multilayered films give a remarkable reduction in friction and at same time maintain high hardness. Interestingly, it is found that the bcc superlattice dominates in both NbMoWTa and Ag layers and the interfaces become coherent when the individual layer thickness h is reduced below 10 nm. The film properties are then strongly dependent on h ranging from 100 to 2.5 nm, and the most promising properties are obtained when the interface structure transforms from incoherent to coherent one. Especially, the multilayer with h = 2.5 nm exhibits superior tribological performance over monolithic NbMoWTa due to the significant coherent strengthening along with the self-lubricating ability in the multilayer. This tailored phase transition and coherent structure between the matrix and lubrication phases can also provide an optimal wear rate–coefficient of friction combination, which is higher than most of the Ag-containing self-lubricating films. The current work might open a new route toward the development of innovative self-lubricating RHEA films with excellent tribological properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Design and Characterization of Self-Lubricating Refractory High Entropy Alloy-Based Multilayered Films

Luo

Zhou

et al. 2021

ACS Appl. Mater. Interfaces

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“…It has also been discussed that the formation of a thin oxide layer reduced the subsequent oxidation and prevented mechanical wear during sliding. Therefore, HEAs are potential candidates to replace existing materials such as Ni-alloys [ 74 , 75 , 76 ] for high-temperature tribological applications in high-temperature nuclear reactors. However, the oxidation mechanisms for the HEAs are not as simple as conventional metals and alloys due to the presence of multiple elements.…”

Section: Future Scope Of the Heas For Tribological Applicationsmentioning

confidence: 99%

Tribological Properties of High-Entropy Alloys under Dry Conditions for a Wide Temperature Range—A Review

2021

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High-entropy alloys (HEAs) are composed of multiple elements with equimolar or near equimolar composition that have superior mechanical and tribological properties. In this article, we present a review on the tribological performance of HEAs. The tribological properties of different HEAs systems have been evaluated, and it has been found that the wear rate strongly depends on the crystal structure of the phases. The most common structures are face-centered cubic (FCC), body-centered cubic (BCC), and dual-phase (FCC + BCC) alloys due to the high entropy of mixing instead of forming intermetallic phases. In general, HEAs with a BCC structure showed superior hardness and wear properties compared to FCC and FCC + BCC alloys. The lesser wear rate of HEAs with a BCC structure is attributed to the reductions in ductility, resulting in strong but brittle alloys. In addition to the crystal structure, the effect of temperature on the tribological performance of the HEAs is also discussed, which highlights their potential applications for high temperatures. Moreover, various other factors such as grain size, formation of an oxide layer, and wear mechanisms are discussed.

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“…Currently, there are not only binary oxides (such as V 2 O 5 , WO 3 , ReO 3 , etc. ), but also ternary oxides (such as PbMoO 4 [8], ZnWO 4 [9], Ag 3 VO 4 [10], AgNbO 3 [11]), which are effective lubricants in high temperature environment.…”

Section: Introductionmentioning

confidence: 99%

Insight into the high-temperature tribological mechanism of VAlTiCrW high entropy alloy film: AlV3O9 from tribochemistry

Liu

Fan

et al. 2022

Friction

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High-entropy alloys have made significant progress in high mechanical properties, wear resistance, and corrosion resistance properties. Excellent tribological properties, especially high-temperature lubrication, have become another sought performance. In this work, VAlTiCrW high-entropy alloy film with body-centered cubic (BCC) structure was prepared on superalloy substrate by magnetron sputtering. It is found that the VAlTiCrW film shows very low friction coefficient of 0.15 and a low wear rate of 10−5 orders of magnitude at 800 °C. After 800 °C oxidation, the film can still obtain a friction coefficient of no more than 0.2 at 700 °C. XRD and TEM revealed the formation of ternary oxide AlV3O9 with preferred orientation of (002) crystal plane with large spacing of 0.71 nm on the wear surface of the film, a high-temperature lubricating phase that has not been reported, realizes the low friction coefficient. This AlV3O9 can be formed by tribochemical reaction under the thermal-mechanical action at 700 °C, but pre-oxidation at 800 °C is the prerequisite in order to form the precursors of V-rich and Al-rich oxide layer.

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High temperature tribological behaviors and wear mechanisms of NiAl–NbC–Ag composites formed by in-situ decomposition of AgNbO3

Cited by 30 publications

References 41 publications

Design and Characterization of Self-Lubricating Refractory High Entropy Alloy-Based Multilayered Films

Design and Characterization of Self-Lubricating Refractory High Entropy Alloy-Based Multilayered Films

Tribological Properties of High-Entropy Alloys under Dry Conditions for a Wide Temperature Range—A Review

Insight into the high-temperature tribological mechanism of VAlTiCrW high entropy alloy film: AlV3O9 from tribochemistry

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