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Coatings
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Functional Coatings and Surface Science for Precision Engineering
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Functional Coatings and Surface Science for Precision Engineering

A special issue of Coatings (ISSN 2079-6412). This special issue belongs to the section "Surface Characterization, Deposition and Modification".

Deadline for manuscript submissions: closed (20 January 2025) | Viewed by 8278

Special Issue Editors

Dr. Chiao-Chi Lin

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Feng Chia University, Taichung 40724, Taiwan
Interests: mechanical properties of materials; hard magnetic coatings by electrodeposition; reliability testing and analysis; energy harvester based on magnetic materials; flexible transparent conductive materials; reliability and durability of photovoltaics
Special Issues, Collections and Topics in MDPI journals
Dr. Hsiang-Chun Hsueh

E-Mail Website
Guest Editor
Micro/Meso Mechanical Manufacturing R&D Department, Metal Industries Research & Development Centre (MIRDC), Kaohsiung 81160, Taiwan
Interests: functional thin film; surface treatment; analysis of residual stress; material reliability analysis

Special Issue Information

Dear Colleagues,

Precision engineering that produces components and systems possessing accuracy in micron, sub-micron, and nano scales is of decisive importance in high-end and emerging technologies. Recent developments in functional coatings and surface science have brought precision engineering into multidisciplinary research and development (mR&D). Driven by the urgent demands of precision components and systems, the need to investigate the application properties and performance of functional coatings at the component and system level has created a huge demand for combinations of experimental, statistical, analytical, and theoretical activities. Functional coatings and surface science are the foundations to promote and advance precision engineering.

This Special Issue of the journal Coatings, which will focus on the “Functional Coatings and Surface Science for Precision Engineering”, will collect new original research and review papers with a special emphasis on the investigation and analysis of materials-to-components and materials-to-systems behaviors of surface and coatings technologies regarding their properties and performance in precision engineering applications. We sincerely invite researchers in related fields to submit relevant manuscripts to this Special Issue, which will serve as a forum for papers on the following concepts:

  • Coatings and surface science for components fidelity and integrity.
  • Surface and coatings technology for tolerance engineering.
  • Coatings and surface science for precision metrology components and systems.
  • Coatings and surface science in MEMS and NEMS.
  • Surface and coatings technology realized by precision and intelligent manufacturing.
  • Precision components in need of surface and coatings technology.
  • Precision design in need of surface and coatings technology.
  • The latest development of data-science-driven investigation of functional coatings and surface science for the advancement of precision engineering.
  • Computational modeling, simulation, and calculation to predict properties, performance, and reliability of functional coatings in the rated conditions of precision engineering systems.

Dr. Chiao-Chi Lin
Dr. Hsiang-Chun Hsueh
Guest Editors

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.

Keywords

  • precision engineering
  • functional coatings
  • surface science
  • precision manufacturing and fabrication
  • precision metrology
  • precision design
  • micro and nano technologies
  • statistical analysis

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

8 pages, 6624 KiB  
Article
HfO2/Al2O3 Multilayer on Parabolic Cylinder Substrate to Monochromatize and Collimate Divergent X-Ray Beam
by Huibin Zhao, Tianyu Yuan, Yanli Li, Xiangdong Kong, Xuepeng Sun and Li Han
Coatings 2024, 14(12), 1489; https://doi.org/10.3390/coatings14121489 - 27 Nov 2024
Cited by 1 | Viewed by 792
Abstract
A monochromatic parallel X-ray beam is essential for some X-ray applications and a multilayer on a parabolic cylinder substrate is a good choice to obtain it. In this work, an HfO2/Al2O3 multilayer with a period of 3.80 nm [...] Read more.
A monochromatic parallel X-ray beam is essential for some X-ray applications and a multilayer on a parabolic cylinder substrate is a good choice to obtain it. In this work, an HfO2/Al2O3 multilayer with a period of 3.80 nm and a bilayer number of 60 is grown on a smooth, flat Si substrate via atomic layer deposition for a monochromatizing Cu kα 0.154 nm X-ray and the first-order peak of the X-ray reflectivity is about 45%. The multilayer-coated Si substrate is then glued on a pre-made stainless steel body with a designed parabolic cylinder profile to convert divergent X-rays from a laboratory X-ray source into a parallel beam. The surface profiles before and after gluing Si on the stainless steel body are almost the same and basically consistent with the designed one. The results show that a monochromatic parallel X-ray (0.154 nm) beam can be acquired by an HfO2/Al2O3 multilayer on a parabolic cylinder substrate and the divergence angle of the reflected beam is 0.67 mrad. Full article
(This article belongs to the Special Issue Functional Coatings and Surface Science for Precision Engineering)
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16 pages, 5483 KiB  
Article
Periodically Sinusoidal Magnetic Stray Field and Improved Film Quality of CoMnP Micro-Magnet Arrays for Magnetic Encoders by Electrodeposition with the Assistance of Ultrasound
by Geng-Hua Xu, Jung-Yen Chang, Hsiang-Chun Hsueh and Chiao-Chi Lin
Coatings 2024, 14(10), 1340; https://doi.org/10.3390/coatings14101340 - 21 Oct 2024
Viewed by 3127
Abstract
Magnetic encoders are composed of a magnetic sensor, a hard magnetic recording medium and a signal processing circuit. Electrodeposited micro-magnet arrays produced by micro-fabrication are promising recording media for enhancing encoder performance. However, two major engineering issues have yet to be resolved. One [...] Read more.
Magnetic encoders are composed of a magnetic sensor, a hard magnetic recording medium and a signal processing circuit. Electrodeposited micro-magnet arrays produced by micro-fabrication are promising recording media for enhancing encoder performance. However, two major engineering issues have yet to be resolved. One issue is an unknown relationship between the feature sizes of micro-magnet arrays and their stray field shapes, and another issue is the formation of micro-cracks due to the built-up residual stresses of thick films. In this study, we investigated the effect of feature sizes on the emanating stray field shape at various observation heights. Feature sizes include two height (i.e., film thickness) values of 78 μm and 176 μm, and both width and spacing with three values of 360 μm, 520 μm and 680 μm. Ultrasound-assisted agitation was adopted for investigating the effects of electrodepositing current densities on the film crystalline microstructures and magnetic properties. Narrowing the width of micro-magnets helps the stray field to become a sinusoidal profile. Thinner film, i.e., thickness 78 μm in this study, supports the stray field taking on a sinusoidal profile. Moreover, the spacing between the micro-magnets plays a key factor in determining the shape of the stray field. Under 37 kHz/156 W ultrasound agitation, the optimal hard magnetic properties of electrodeposited CoMnP films are residual magnetization 2329 G and coercivity 968 Oe by a current density of 10.0 mA/cm2. Ultrasound-assisted electrodeposition, along with duly designed feature size, facilitates the micro-magnet arrays having a sinusoidal stray field shape using high quality films. Furthermore, for the first time, a systematic understanding of feature-size-dependent stray field evolution and improved polarities quality has been realized for the recording media of sinusoidal magnetic encoders. Full article
(This article belongs to the Special Issue Functional Coatings and Surface Science for Precision Engineering)
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10 pages, 5124 KiB  
Article
Thick Columnar-Structured Thermal Barrier Coatings Using the Suspension Plasma Spray Process
by Dianying Chen and Christopher Dambra
Coatings 2024, 14(8), 996; https://doi.org/10.3390/coatings14080996 - 7 Aug 2024
Cited by 5 | Viewed by 1863
Abstract
Higher operating temperatures for gas turbine engines require highly durable thermal barrier coatings (TBCs) with improved insulation properties. A suspension plasma spray process (SPS) had been developed for the deposition of columnar-structured TBCs. SPS columnar TBCs are normally achieved at a short standoff [...] Read more.
Higher operating temperatures for gas turbine engines require highly durable thermal barrier coatings (TBCs) with improved insulation properties. A suspension plasma spray process (SPS) had been developed for the deposition of columnar-structured TBCs. SPS columnar TBCs are normally achieved at a short standoff distance (50.0 mm–75.0 mm), which is not practical when coating complex-shaped engine hardware since the plasma torch may collide with the components being sprayed. Therefore, it is critical to develop SPS columnar TBCs at longer standoff distances. In this work, a commercially available pressure-based suspension delivery system was used to deliver the suspension to the plasma jet, and a high-enthalpy TriplexPro-210 plasma torch was used for the SPS coating deposition. Suspension injection pressure was optimized to maximize the number of droplets injected into the hot plasma core and achieving the best particle-melting states and deposition efficiency. The highest deposition efficiency of 51% was achieved at 0.34 MPa injection pressure with a suspension flow rate of 31.0 g/min. With the optimized process parameters, 1000 μm thick columnar-structured SPS 8 wt% Y2O3-stabilized ZrO2 (8YSZ) TBCs were successfully developed at a standoff distance of 100.0 mm. The SPS TBCs have a columnar width between 100 μm and 300 μm with a porosity of ~22%. Furnace cycling tests at 1125 °C showed the SPS columnar TBCs had an average life of 1012 cycles, which is ~2.5 times that of reference air-plasma-sprayed dense vertically cracked TBCs with the same coating thickness. The superior durability of the SPS columnar TBCs can be attributed to the high-strain-tolerant microstructure. SEM cross-section characterization indicated the failure of the SPS TBCs occurred at the ceramic top coat and thermally grown oxide (TGO) interface. Full article
(This article belongs to the Special Issue Functional Coatings and Surface Science for Precision Engineering)
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