Tailoring CrNx stoichiometry and functionality by means of reactive HiPIMS

Sánchez-López, J.C.; Caro, A.; Alcalá, G.; Rojas, Teresa Cristina

doi:10.1016/j.surfcoat.2020.126235

Cited by 20 publications

(16 citation statements)

References 48 publications

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“…In this section, the structural and optical behavior of three selected coatings (CrN1.08, CrN0.95 and CrN0.67) are presented. These stoichiometries correspond to samples D, A and C, respectively, in [30]. The films exhibited different crystalline composition and columnar morphology as can be seen in Fig.…”

Section: Crny Films: Structural and Chemical Characterizationsupporting

confidence: 53%

“…The films exhibited different crystalline composition and columnar morphology as can be seen in Fig. 4 and 6 from [30]. The fcc-CrN phase is found by XRD in all cases with a significant shift towards higher angles as the nitrogen content decreased.…”

Section: Crny Films: Structural and Chemical Characterizationmentioning

confidence: 79%

“…A set of CrNy films with different stoichiometries (from y=0.67 to 1.08) was prepared by HiPIMS changing the pulse characteristics and nitrogen fluxes. The synthesis parameters, film characterization (morphology, microstructure and chemical composition) and mechanical and oxidation resistance properties can be found elsewhere [30]. In this section, the structural and optical behavior of three selected coatings (CrN1.08, CrN0.95 and CrN0.67) are presented.…”

Section: Crny Films: Structural and Chemical Characterizationmentioning

confidence: 99%

“…Fig. 4 in [30]), a secondary phasehexagonal Cr2N is formed in addition to stoichiometric fcc-CrN and sub-stoichiometric CrNy phases. It has been reported previously that low nitrogen flow can result in the formation of hcp-Cr2N [28,34].…”

Section: Crny Films: Structural and Chemical Characterizationmentioning

confidence: 99%

“…In this sense, two set of films (CrNy and Cr1-xAlxNy) with different stoichiometries have been prepared using DC/HiPIMS technology aiming to correlate chemical composition with the structure and the optical properties. In a previous paper [30], the influence of pulse parameters on the chemical composition, mechanical and oxidation resistances properties of the CrNy films has been deeply studied, while in this work we focus on the structure and optical properties of the CrNy films, as well as on an exhaustive chemical, structural and optical characterization of the Cr1-xAlxNy films. The determination of the optical constants of Cr1-x(Alx)Ny films with variable metallic contents and metal/nitrogen ratios will serve as fundamental database to develop solar selective coatings.…”

Section: Introductionmentioning

confidence: 99%

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High-temperature solar-selective coatings based on Cr(Al)N. Part 1: Microstructure and optical properties of CrNy and Cr1-xAlxNy films prepared by DC/HiPIMS

Rojas

Caro

Lozano

et al. 2021

Solar Energy Materials and Solar Cells

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In order to explore the potentialities of xNy materials in multilayer-based solar selective coatings (SSC) for high temperature applications (T>500 ºC), the optical behavior of Cr1-x(Al)xNy films is studied in this work. Two sets of layers (CrNy and Cr1-xAlxNy) were prepared by direct current (DC) and high-power impulse magnetron sputtering (HiPIMS) technology. The deposition parameters: N2 flux, HiPIMS frequency and aluminum sputtering power, were modified to get a wide variety of stoichiometries. The composition, morphology, phases and electronic structure of the films were characterized in depth. The optical behavior was determined by UV-Vis-NIR and FTIR spectroscopies, and the optical constants were obtained from the measured transmittance and reflectance spectra based on appropriate dielectric function models. Our results indicate that small changes in the layer composition influence the optical constant. In particular, a metallic-like behavior was obtained for CrNy layers with N vacancies (CrN0.95 and CrN0.67 films) while a semiconductor-like behavior was observed for CrN1.08. Thus, the CrNy films can be used as effective absorber layer in multilayerbased SSC, and namely, the CrN0.67 film as an IR reflector/absorber layer too. Likewise, the optical properties of Cr1-xAlxNy layers can also be tuned from metallic to semiconductor-like behavior depending on the chemical composition. Indeed, the absorption coefficients of Cr1-xAlxNy films with optimized Al content and N-vacancies are comparable to those reported for state-of-the-art materials such as TiAlN or TiAlCrN. In addition, a Cr0.96Al0.04N0.89 film was found to be a suitable IR reflector/absorber layer.

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Section: Crny Films: Structural and Chemical Characterizationsupporting

confidence: 53%

Section: Crny Films: Structural and Chemical Characterizationmentioning

confidence: 79%

Section: Crny Films: Structural and Chemical Characterizationmentioning

confidence: 99%

Section: Crny Films: Structural and Chemical Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-temperature solar-selective coatings based on Cr(Al)N. Part 1: Microstructure and optical properties of CrNy and Cr1-xAlxNy films prepared by DC/HiPIMS

Rojas

Caro

Lozano

et al. 2021

Solar Energy Materials and Solar Cells

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Contribution of galvanic coupling with TiN, TiAlN, and CrN to the corrosion of steel in neutral and acidic chloride solutions

Avcı

Kazmanlı

Evren

et al. 2023

Materials & Corrosion

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The inherent defective morphology of the physical vapor deposition (PVD) hard coatings limits their corrosion protective ability. We examined the impact of nitride‐based PVD coatings, including TiN, TiAlN, and CrN deposited on inert substrates by cathodic arc PVD method (CA‐PVD), on the galvanic corrosion of carbon steel. Their contribution was evaluated by zero‐resistance ammeter (ZRA) and electrochemical impedance spectroscopy (EIS) in 3.5 wt.% NaCl at pH 2 and 6, with and without aeration. The results indicated the prominent role of the coating type and the coupling environment on the generated galvanic currents. Immersion tests for the TiN‐, TiAlN‐, and CrN‐coated steel cross‐sections visually verified these results. The galvanic current contribution was distinct in environments where oxygen reduction is the dominant cathodic reaction. However, the layers' contribution to galvanic corrosion was minimal in deaerated acidic solutions, which is attributed to the high bonding strength of adsorbed intermediates to the coating surfaces.

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Effect of bias voltage on the growth of super-hard (AlCrTiVZr)N high-entropy alloy nitride films synthesized by high power impulse magnetron sputtering

et al. 2021

Applied Surface Science

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Tailoring CrNx stoichiometry and functionality by means of reactive HiPIMS

Cited by 20 publications

References 48 publications

High-temperature solar-selective coatings based on Cr(Al)N. Part 1: Microstructure and optical properties of CrNy and Cr1-xAlxNy films prepared by DC/HiPIMS

High-temperature solar-selective coatings based on Cr(Al)N. Part 1: Microstructure and optical properties of CrNy and Cr1-xAlxNy films prepared by DC/HiPIMS

Contribution of galvanic coupling with TiN, TiAlN, and CrN to the corrosion of steel in neutral and acidic chloride solutions

Effect of bias voltage on the growth of super-hard (AlCrTiVZr)N high-entropy alloy nitride films synthesized by high power impulse magnetron sputtering

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