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Coatings
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Stress in Thin Films and Coatings
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Stress in Thin Films and Coatings

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (29 February 2020) | Viewed by 10021

Special Issue Editor

Dr. Alexey Vereshchaka

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Guest Editor
Department of Mechanical Engineering, Moscow State Technological University STANKIN, Moscow 127055, Russia
Interests: surface modification; functional coatings; cutting tool; tool wear
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Stresses produce a significant impact on the performance properties of coatings and thin films. The stresses are formed in the process of coating deposition and coating operation. The formation of stresses is influenced by factors such as the temperature, force impacts, vibrations, and chemical and diffusion processes. As a result, the small thickness of coatings, and, in some cases, the presence of the internal nanolayer structure and the registration of the internal stresses is associated with certain problems. The objective of the Thematic Issue is to summarize the current level of knowledge in the field of predicting the formation of internal stresses, the methods for measuring them, and their influence on the properties of coatings in various fields of application.

You are welcome to submit your articles on stress in thin films and coatings, including (but not limited to) the following topics:

  • the modern methods for measuring the stresses in the coatings and thin films;
  • the methods for modeling the stress distribution in the coatings and thin films, and predicting their transformation under the influence of external factors;
  • the stress effect on the functional properties of coated products;
  • the causes of stress formation in the coatings and thin films, and the methods of stress transformation and reduction.

Dr. Alexey Vereshchaka
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (3 papers)

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Research

16 pages, 11528 KiB  
Article
Investigation of Properties of the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Me,Al)N Coatings, Where Me Means Cr, Ti, or Mo
by Alexey Vereschaka, Nikolay Sitnikov, Marina Volosova, Anton Seleznev, Catherine Sotova and Jury Bublikov
Coatings 2021, 11(12), 1471; https://doi.org/10.3390/coatings11121471 - 29 Nov 2021
Cited by 5 | Viewed by 1909
Abstract
The article describes the results of the investigation focused on the properties of the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Me,Al)N coatings, where Me means chromium (Cr), titanium (Ti), or molybdenum (Mo). These coatings have three-layer architecture, including adhesion, transition, and wear-resistant layers, while the latter, in turn, has [...] Read more.
The article describes the results of the investigation focused on the properties of the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Me,Al)N coatings, where Me means chromium (Cr), titanium (Ti), or molybdenum (Mo). These coatings have three-layer architecture, including adhesion, transition, and wear-resistant layers, while the latter, in turn, has a nanolayer structure. Despite the fact that the coatings under study have close values of hardness and critical fracture load LC2, there are noticeable differences in wear resistance during the turning of steel. The tools with the coatings under study demonstrated better wear resistance compared to an uncoated tool and the tool with the commercial ZrN coating. The best wear resistance was detected for a tool with the Zr,Hf-(Zr,Hf)N-(Zr,Hf,Ti,Al)N coating. The study of the pattern of cracking in the structure of the coatings has found that, during the cutting process, active cracking occurs in the coating with Cr, which leads to the fracture of the coating, while the process of cracking is noticeably less active in the coatings with Ti or Mo. Full article
(This article belongs to the Special Issue Stress in Thin Films and Coatings)
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16 pages, 3637 KiB  
Article
Influence of the Thickness of a Nanolayer Composite Coating on Values of Residual Stress and the Nature of Coating Wear
by Alexey Vereschaka, Marina Volosova, Anatoli Chigarev, Nikolay Sitnikov, Artem Ashmarin, Catherine Sotova, Jury Bublikov and Dmitry Lytkin
Coatings 2020, 10(1), 63; https://doi.org/10.3390/coatings10010063 - 10 Jan 2020
Cited by 21 | Viewed by 3455
Abstract
The article discusses the influence of the thickness of the wear-resistant layer of the Zr-ZrN-(Zr,Al,Si)N nanolayer composite coating on the values of residual stress and the nature of coating wear. The study focused on coatings with wear-resistant layer thicknesses of 2.0, 4.3, 5.9, [...] Read more.
The article discusses the influence of the thickness of the wear-resistant layer of the Zr-ZrN-(Zr,Al,Si)N nanolayer composite coating on the values of residual stress and the nature of coating wear. The study focused on coatings with wear-resistant layer thicknesses of 2.0, 4.3, 5.9, and 8.5 µm, deposited using filtered cathodic vacuum arc deposition (FCVAD) technology. The X-ray diffraction (XRD) method based on the anisotropy of the elasticity modulus was used to find the values of the residual stress. The nature of the formation of interlayer delamination under the influence of residual compressive stress was studied using a scanning electron microscope (SEM). When the wear-resistant layers had a thickness of 2.0–5.9 μm, tensile stress formed, which decreased with an increase in the thickness of the coating. When the thickness of a wear-resistant layer was 8.5 μm, compressive stress formed. Under the action of compressive stress, periodic interlayer delamination formed, with a pitch of about 10 binary nanolayers. A mathematical model is proposed to describe the nature of the formation of interlayer delamination under the influence of compressive residual stress, including in the presence of a microdroplet embedded in the coating structure. Full article
(This article belongs to the Special Issue Stress in Thin Films and Coatings)
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11 pages, 2525 KiB  
Article
Study on Local Residual Stress in a Nanocrystalline Cr2O3 Coating by Micro-Raman Spectroscopy
by Qiu Li, Yanrong Gou, Tie-Gang Wang, Tingyi Gu, Qiang Yu and Lijie Wang
Coatings 2019, 9(8), 500; https://doi.org/10.3390/coatings9080500 - 07 Aug 2019
Cited by 18 | Viewed by 3885
Abstract
Residual stress in coatings often affects the service performance of coatings, and the residual stresses in some local areas even lead to premature failure of coatings. In this work, we characterized the residual stress of local micro-areas of a nanocrystalline Cr2O [...] Read more.
Residual stress in coatings often affects the service performance of coatings, and the residual stresses in some local areas even lead to premature failure of coatings. In this work, we characterized the residual stress of local micro-areas of a nanocrystalline Cr2O3 coating deposited on a Si wafer through micro-Raman spectroscopy, including the depositional edge zone where the electrode was placed, the micro-area containing Cr2O3 macroparticles, and other micro-areas vulnerable to cracks. To accurately measure the thickness of the coating, we combined optical interferometry and direct measurement by a profilometer. The results indicate the existence of in-plane tensile residual stress on the Cr2O3 coating. In thick coatings, the residual stress is independent of the coating thickness and is stable between 0.55 GPa and 0.75 GPa. As the coating thickness is less than 0.8 μm, the residual stress is directly related to the coating thickness. This in-plane tensile stress is considered as the origin of the observed microcrack, which can partially release the stress. Full article
(This article belongs to the Special Issue Stress in Thin Films and Coatings)
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