Failure and adhesion characterization of tungsten–carbon single layers, multilayered and graded coatings

Harry, E.; Rouzaud, A.; Juliet, P.; Pauleau, Y.; Ignat, M.

doi:10.1016/s0257-8972(99)00071-7

Cited by 21 publications

(4 citation statements)

References 3 publications

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“…Some authors define the lowest critical load (Lc 1 ) as a way to measure crack resistance and even term it as a measure of scratch toughness the crack initiation merely indicates the morphology of cracks in the scratch track and does not necessarily mean film fracture.…”

Section: Resultsmentioning

confidence: 99%

Corrosion behavior of Al2024‐T3, Al5052‐H32, and Al6061‐T6 aluminum alloys coated with DLC films in aviation fuel medium, Jet A‐1 and AVGAS 100LL

Macário

Vieira

Manfroi

et al. 2019

Materials & Corrosion

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In aircraft and storage fuel tanks, many environmental corrosion factors can be present, which can cause breakdown to the passive film of aluminum causing severe localized corrosion. Aiming to a solution to this problem, diamond-like carbon (DLC) films were deposited on substrates Al 2024-T3, Al 5052-H32, and Al 6061-T6. The substrates with and without DLC films were submitted to a corrosive immersion test with aviation fuel Jet-A1 and AVGAS 100LL. The surface morphology from aluminum substrates with and without DLC films was analyzed before and after 7 and 30 days of corrosive immersion tests by SEM. The adhesion of the DLC films was evaluated according to the ASTM-C1624 scratching test standard, and the optical profilometry was used to measure the thickness and roughness. Silver nanoparticles were also added in DLC films samples due to its antibacterial properties to check the stability and resistance against corrosive fuel medium. The results indicated an improvement of corrosion resistance just with DLC films. The silver nanoparticles did not present any advantages in this corrosion protection, and the aluminum alloys suffered more corrosion than when protected by DLC films. K E Y W O R D SAl 2024-T3, Al 5052-H32, Al 6061-T6.

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Section: Resultsmentioning

confidence: 99%

Corrosion behavior of Al2024‐T3, Al5052‐H32, and Al6061‐T6 aluminum alloys coated with DLC films in aviation fuel medium, Jet A‐1 and AVGAS 100LL

Macário

Vieira

Manfroi

et al. 2019

Materials & Corrosion

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“…Generally, the metallic films behave like a ductile material, and are presumably able to accommodate the indentor displacement through relative motion of the columns, which lead to a partial dissipation of the stress or energy stored in the layer and can prevent the detachment of the layers from the substrate surface which, in turn, contributes to a better adhesion than that of the ceramic films. 27 However, the thickness of all the deposited films is only around 200 nm. The deposited films will be penetrated by the diamond tip at lower load during the scratch test, which will lead to the sudden increase of friction force at lower load and contributes to the lower critical load.…”

Section: Resultsmentioning

confidence: 99%

Characterization of (Ti, Al)N films deposited by off-plane double bend filtered cathodic vacuum arc

Cheng

Tay

Lau

et al. 2001

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Microstructural and optical properties of aluminum oxide thin films prepared by off-plane filtered cathodic vacuum arc system J. Vac. Sci. Technol. A 21, 906 (2003); 10.1116/1.1577132 Structure and mechanical properties of tungsten carbide films deposited by off-plane double bend filtered cathodic vacuum arc Influence of substrate bias on the structure and properties of (Ti,Al)N films deposited by filtered cathodic vacuum arc J.Establishing the relationship between process, structure, and properties of TiN films deposited by electron cyclotron resonance assisted reactive sputtering. I. Variations in hardness and roughness as a function of process parameters ͑Ti, Al͒N films were deposited by a new off-plane double bend filtered cathodic vacuum arc technique under a nitrogen atmosphere at room temperature. Scanning electron microscopy and atomic force microscopy were used to observe the surface morphology of the deposited films. X-ray photoelectron spectroscopy was used to determine the composition and bonding structure of the deposited films. A scratch test was used to access the film adhesion. The deposited films are atomically smooth and particle free. The Al/Ti atomic ratio in the deposited films is around 1. The films deposited at the pressure of 1ϫ10 Ϫ4 Torr are composed of metallic Ti and Al phase and a small amount of ͑Ti, Al͒N phase. For the films deposited at the pressure of 1.5ϫ10 Ϫ3 Torr, ͑Ti, Al͒N phases are dominant. The scratch test indicates that the critical load increases with increasing deposition pressure up to 1.5ϫ10 Ϫ3 Torr, then decrease drastically with the further increase of deposition pressure. As substrate bias is increased, critical load increases and reachs the maximum at the bias of 200 V, then decreases at higher bias. The hardness of the deposited films is found to be the main factor that affects the critical load of the thin films.

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“…The reported K IC values in the current work are in a comparable range, although pure tungsten was used in literature and the grain size is definitely larger compared to the investigated specimens. Magnetron sputtered tungsten, which has a more similar grain size to the investigated samples, shows a fracture toughness ranging from 1 to 2.5 MPa √ m [33]. However, these sputtered films again consist of pure tungsten, while in this work a W-Cu 20%wt was studied.…”

Section: Articlementioning

confidence: 92%

Crack length estimations for small-scale fracture experiments via image processing techniques

Schmuck

Alfreider

Kiener

2022

Journal of Materials Research

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Accurate knowledge of the current crack length is crucial to evaluate fracture mechanical tests. At the sub-micron to micron scale, the crack length is directly accessible via observation during in-situ experiments in electron microscopes, or indirectly via calculation from sample stiffness. In the current work, image processing techniques were used to introduce a semi-automatic technique to measure crack lengths at the micron scale from image sequences. The technique utilizes manually defined filters and searches for contours near the previous crack tip locating the new one according to the previous position. To demonstrate validity and capability, three micron-sized notched cantilevers were prepared for bending experiments and tested in-situ by partial unloading. Comparison of crack lengths determined by the proposed method, manual measurement and sample stiffness revealed a reasonable agreement, while occasional deviations allow further insights into the crack behaviour. Thus, our new approach enables more in-depth investigation of small-scale fracture processes. Graphical abstract

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Failure and adhesion characterization of tungsten–carbon single layers, multilayered and graded coatings

Cited by 21 publications

References 3 publications

Corrosion behavior of Al2024‐T3, Al5052‐H32, and Al6061‐T6 aluminum alloys coated with DLC films in aviation fuel medium, Jet A‐1 and AVGAS 100LL

Corrosion behavior of Al2024‐T3, Al5052‐H32, and Al6061‐T6 aluminum alloys coated with DLC films in aviation fuel medium, Jet A‐1 and AVGAS 100LL

Characterization of (Ti, Al)N films deposited by off-plane double bend filtered cathodic vacuum arc

Crack length estimations for small-scale fracture experiments via image processing techniques

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