Residual stress relief of hard a-C films though buckling

Liu, D.G.; Zheng, Liang; Liu, J.Q.; Luo, Laima; Wu, Yucheng

doi:10.1016/j.ceramint.2017.11.115

Cited by 11 publications

(3 citation statements)

References 52 publications

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“…energy outputs (40% and 50% laser outputs), it is inferred that TiC, characterized by relatively higher formation energy, is likely to be the primary phase formed. The sp 2 /sp 3 ratio was calculated to be 2.34 at 20% laser output in Table 2, while the 40% and 50% laser outputs showed ratios of 3.07 and 3.19, respectively; this is attributed to the accumulation of residual stress within the lattice due to the high thermal energy and carbon doping, leading to the formation of amorphous carbon over the solubility limit of carbon within the coating [39,40]. Figure 3 indicates the microstructural variation in the coatings using TEM images and SAED (selected area electron diffraction) patterns.…”

Section: Resultsmentioning

confidence: 99%

The Bonding State and Surface Roughness of Carbon-Doped TiZrN Coatings for Hydrogen Permeation Barriers

Kim,

Lee

et al. 2023

Nanomaterials

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We doped carbon into a TiZrN coating to reduce hydrogen permeability, and investigated the phase formation, bonding state, microstructure, and surface roughness of the carbon-doped TiZrN. The laser output for laser carburization was limited to a range of 20–50%. The grain size of the TiZrN coatings decreased from 26.49 nm before carburization to 18.31 nm after carburization. For XPS analysis, the sp2/sp3 ratio was 1.23 at 20% laser output, but it showed 2.64 at 40% laser output, which means that amorphous carbon was formed. As the grain size decreased with the formation of amorphous carbon, the surface microstructure of the carbon-doped TiZrN coatings transitioned to an intergranular structure, indicating the creation of amorphous carbon-embedded (Ti, Zr)(C, N) in the coating. The surface roughness (Ra) of the carbon-doped TiZrN coating was decreased to a maximum of 7.12 nm, and the hydrogen permeability correspondingly decreased by 78% at 573 K.

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Section: Resultsmentioning

confidence: 99%

The Bonding State and Surface Roughness of Carbon-Doped TiZrN Coatings for Hydrogen Permeation Barriers

Kim,

Lee

et al. 2023

Nanomaterials

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“…However, after reaching 40% thermal energy, amorphous carbon began to form in the nitrogen vacancies or grains of TiZrN because the carbon solid solution limit had been exceeded. It was considered to be the result of the combination of thermal energy and incremental residual stress in the carbon-doped TiZrN coatings by the formation of carbides [22,23]. Using HR-XRD, Figure 4 shows the effect of doped carbon on TiZrN coatings according to the laser thermal energy applied.…”

Section: Resultsmentioning

confidence: 99%

Phase Formation and Wear Resistance of Carbon-Doped TiZrN Nanocomposite Coatings by Laser Carburization

Kim

Hong

et al. 2021

Metals

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Carbon-doped TiZrN nanocomposite coatings were investigated for phase formation and wear behavior. They were prepared by laser carburization using carbon paste, and the thermal energy of the pulsed laser was limited to the range of 20 to 50%. X-ray photoelectron spectroscopy analysis revealed that the ratio of carbide (TiC, ZrC) increased as the thermal energy of the laser increased. The sp2/sp3 ratio increased by approximately 16% when the laser thermal energy was raised from 30 to 40%, and the formation of amorphous carbon was confirmed in the carbon-doped TiZrN coatings. As a result of microstructural analysis, the carbon-doped TiZrN nanocomposite was formed by an increase of hybrid bonds in expanded localized carbon clusters. Wear resistance was evaluated using a ball-on-disc tester, which showed that the friction coefficient decreased from 0.74 to 0.11 and the wear rate decreased from 7.63 × 10−6 mm3 (Nm)−1 to 1.26 × 10−6 mm3 (Nm)−1. In particular, the friction coefficient and wear rate improved by 71 and 66%, respectively, owing to the formation of carbon-doped TiZrN nanocomposite with amorphous carbon while the thermal energy was increased from 30 to 40%.

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“…Nevertheless, a similar Lc2, of 73 N, was achieved by Liu et al (2018) for a hydrogenated coating with thickness of 50 µm, deposited by anode layer ion source. For that case, the adhesion improvement was explained by a highly energetic chromium and carbon ion treatment that produced a graded interfacial structure.…”

Section: Adhesion Testmentioning

confidence: 76%

Adhesion improvement of thick DLC coatings produced by cathodic arc evaporation over stainless steel using carbon bombardment step.

Mazuco¹

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Autorizo a reprodução e divulgação total ou parcial deste trabalho, por qualquer meio convencional ou eletrônico, para fins de estudo e pesquisa, desde que citada a fonte. Catalogação-na-publicação Mazuco, FelipeAdhesion improvement of thick DLC coatings produced by cathodic arc evaporation over stainless steel using carbon bombardment step / F. Mazuco -versão corr. --São Paulo, 2021. 96 p.

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Residual stress relief of hard a-C films though buckling

Cited by 11 publications

References 52 publications

The Bonding State and Surface Roughness of Carbon-Doped TiZrN Coatings for Hydrogen Permeation Barriers

The Bonding State and Surface Roughness of Carbon-Doped TiZrN Coatings for Hydrogen Permeation Barriers

Phase Formation and Wear Resistance of Carbon-Doped TiZrN Nanocomposite Coatings by Laser Carburization

Adhesion improvement of thick DLC coatings produced by cathodic arc evaporation over stainless steel using carbon bombardment step.

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