Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.7
3.4
Journals
Coatings
Special Issues
Mechanical Properties of Advanced Multifunctional Coatings
share announcement

Mechanical Properties of Advanced Multifunctional Coatings

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

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 34416

Printed Edition Available!
A printed edition of this Special Issue is available here.

Special Issue Editors

Dr. Rong-Guang Xu

E-Mail Website
Guest Editor
Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA
Interests: multifunctional coatings; coatings synthesis; coating characterization; multiscale modeling; mechanical behaviors
Prof. Dr. Zhitong Chen

E-Mail Website
Guest Editor
1. Center for Advanced Therapy, National Innovation Center for Advanced Medical Devices, Shenzhen 518000, China
2. Institute of Biomedical and Health Engineering, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
Interests: plasma physics; plasma medicine; medical devices
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Peijian Chen

E-Mail
Guest Editor
School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
Prof. Dr. Guangjian Peng

E-Mail
Guest Editor
College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Special Issue Information

Dear Colleagues,

Advanced multifunctional coatings have always attracted a lot of attention due to the great and unpredicted progress in their synthesis, characterization, and properties. They have also been widely used in different fields, such as aeronautics, transportation, biomedicine, electrical and electronic equipment, etc. Mechanical properties are key to how advanced multifunctional coatings interact with external forces and environmental factors. An in-depth understanding of mechanical properties of these coatings, however, still requires complex material modeling and characterization tools. This Special Issue aims to present the latest findings and to promote further research in the areas of mechanical behaviors of advanced multifunctional coatings, including experimental characterization and theoretical calculations. Full papers, review articles, and communications are all welcome.

Potential topics include but are not limited to the following topics:

  • Advanced multifunctional coatings in mechatronics;
  • Advanced characterization methods and tools;
  • Advanced coatings for preparation and applications;
  • Numerical simulations and computational modeling, including FEM/XFEM, MD, MC, DFT, etc.;
  • Theoretical studies;
  • Design and synthesis strategies affecting mechanical behaviors;
  • Industrial case studies.

Dr. Rong-Guang Xu
Dr. Zhitong Chen
Prof. Dr. Peijian Chen
Prof. Dr. Guangjian Peng
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.

Published Papers (14 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Editorial

Jump to: Research

5 pages, 197 KiB  
Editorial
Special Issue: Mechanical Properties of Advanced Multifunctional Coatings
by Rong-Guang Xu, Zhitong Chen, Peijian Chen and Guangjian Peng
Coatings 2022, 12(5), 599; https://doi.org/10.3390/coatings12050599 - 28 Apr 2022
Cited by 3 | Viewed by 2350
Abstract
Coatings are found almost anywhere in the modern world [...] Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)

Research

Jump to: Editorial

10 pages, 1768 KiB  
Article
Influence to Hardness of Alternating Sequence of Atomic Layer Deposited Harder Alumina and Softer Tantala Nanolaminates
by Helle-Mai Piirsoo, Taivo Jõgiaas, Peeter Ritslaid, Kaupo Kukli and Aile Tamm
Coatings 2022, 12(3), 404; https://doi.org/10.3390/coatings12030404 - 18 Mar 2022
Cited by 3 | Viewed by 1968
Abstract
Atomic layer deposited amorphous 70 nm thick Al2O3-Ta2O5 double- and triple-layered films were investigated with the nanoindentation method. The sequence of the oxides from surface to substrate along with the layer thickness had an influence on [...] Read more.
Atomic layer deposited amorphous 70 nm thick Al2O3-Ta2O5 double- and triple-layered films were investigated with the nanoindentation method. The sequence of the oxides from surface to substrate along with the layer thickness had an influence on the hardness causing rises and declines in hardness along the depth yet did not affect the elastic modulus. Hardness varied from 8 to 11 GPa for the laminates having higher dependence on the structure near the surface than at higher depths. Triple-layered Al2O3/Ta2O5/Al2O3 laminate possessed the most even rise of hardness along the depth and possessed the highest hardness out of the laminates (11 GPa at 40 nm). Elastic modulus had steady values along the depth of the films between 145 and 155 GPa. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

11 pages, 2772 KiB  
Article
Measurement of Stress Optic Coefficient for Thermal Barrier Coating Based on Terahertz Time-Domain Spectrum
by Zong Wang, Yanheng Zhang, Ning Lu, Zhiyong Wang and Wei Qiu
Coatings 2021, 11(10), 1265; https://doi.org/10.3390/coatings11101265 - 18 Oct 2021
Cited by 3 | Viewed by 1859
Abstract
The residual stress introduced inside the thermal barrier coating (TBC) top coating during manufacturing and service processes is one of the main causes of thermal barrier failure. Therefore, a nondestructive and accurate measurement of the residual stress in top coating is essential for [...] Read more.
The residual stress introduced inside the thermal barrier coating (TBC) top coating during manufacturing and service processes is one of the main causes of thermal barrier failure. Therefore, a nondestructive and accurate measurement of the residual stress in top coating is essential for the evaluation of TBC life. The terahertz time-domain spectroscopy (THz-TDS) technique, which is based on the calibration or measurement of the stress optical coefficients of the measured materials, is applicable to the measuring of internal stress of nonmetal materials. In this work, to characterize the internal stress in TBC, the stress optic coefficient of the TBC top coating was measured by reflection-type THz-TDS. First, the mechanics model for the internal stress measurement in a TBC top coating was derived based on the photoelastic theory. Then, the THz time-domain spectra of TBC specimens under different loadings were measured in situ by a reflection-type THz-TDS system. Finally, the unimodal fitting, multimodal fitting and barycenter methods were used to carry out the data processing of the THz time-domain spectral-characteristic peaks. By comparing the processed results, the results using the barycenter method were regarded as the calibrated stress optical coefficient of the TBC due to the method’s sufficient accuracy and stability. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

13 pages, 4191 KiB  
Article
Numerical Investigation for the Resin Filling Behavior during Ultraviolet Nanoimprint Lithography of Subwavelength Moth-Eye Nanostructure
by Yuanchi Cui, Xuewen Wang, Chengpeng Zhang, Jilai Wang and Zhenyu Shi
Coatings 2021, 11(7), 799; https://doi.org/10.3390/coatings11070799 - 01 Jul 2021
Cited by 3 | Viewed by 2576
Abstract
Accurate analysis of the resin filling process into the mold cavity is necessary for the high-precision fabrication of moth-eye nanostructure using the ultraviolet nanoimprint lithography (UV-NIL) technique. In this research, a computational fluid dynamics (CFD) simulation model was proposed to reveal resin filling [...] Read more.
Accurate analysis of the resin filling process into the mold cavity is necessary for the high-precision fabrication of moth-eye nanostructure using the ultraviolet nanoimprint lithography (UV-NIL) technique. In this research, a computational fluid dynamics (CFD) simulation model was proposed to reveal resin filling behavior, in which the effect of boundary slip was considered. By comparison with the experimental results, a good consistency was found, indicating that the simulation model could be used to analyze the resin filling behavior. Based on the proposed model, the effects of process parameters on resin filling behavior were analyzed, including resin viscosity, inlet velocity and resin thickness. It was found that the inlet velocity showed a more significant effect on filling height than the resin viscosity and thickness. Besides, the effects of boundary conditions on resin filling behavior were investigated, and it was found the boundary slip had a significant influence on resin filling behavior, and excellent filling results were obtained with a larger slip velocity on the mold side. This research could provide guidance for a more comprehensive understanding of the resin filling behavior during UV-NIL of subwavelength moth-eye nanostructure. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

19 pages, 6388 KiB  
Article
Nanoindentation Hardness and Practical Scratch Resistance in Mechanically Tunable Anti-Reflection Coatings
by James J. Price, Tingge Xu, Binwei Zhang, Lin Lin, Karl W. Koch, Eric L. Null, Kevin B. Reiman, Charles A. Paulson, Chang-Gyu Kim, Sang-Yoon Oh, Jung-Keun Oh, Dong-Gun Moon, Jeong-Hong Oh, Alexandre Mayolet, Carlo Kosik Williams and Shandon D. Hart
Coatings 2021, 11(2), 213; https://doi.org/10.3390/coatings11020213 - 12 Feb 2021
Cited by 6 | Viewed by 3830
Abstract
This work presents fundamental understanding of the correlation between nanoindentation hardness and practical scratch resistance for mechanically tunable anti-reflective (AR) hardcoatings. These coatings exhibit a unique design freedom, allowing quasi-continuous variation in the thickness of a central hardcoat layer in the multilayer design, [...] Read more.
This work presents fundamental understanding of the correlation between nanoindentation hardness and practical scratch resistance for mechanically tunable anti-reflective (AR) hardcoatings. These coatings exhibit a unique design freedom, allowing quasi-continuous variation in the thickness of a central hardcoat layer in the multilayer design, with minimal impact on anti-reflective optical performance. This allows detailed study of anti-reflection coating durability based on variations in hardness vs. depth profiles, without the durability results being confounded by variations in optics. Finite element modeling is shown to be a useful tool for the design and analysis of hardness vs. depth profiles in these multilayer films. Using samples fabricated by reactive sputtering, nanoindentation hardness depth profiles were correlated with practical scratch resistance using three different scratch and abrasion test methods, simulating real world scratch events. Scratch depths from these experiments are shown to correlate to scratches observed in the field from consumer electronics devices with chemically strengthened glass covers. For high practical scratch resistance, coating designs with hardness >15 GPa maintained over depths of 200–800 nm were found to be particularly excellent, which is a substantially greater depth of high hardness than can be achieved using previously common AR coating designs. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

14 pages, 5814 KiB  
Article
Comparison and Selection of Data Processing Methods for the Application of Cr3+ Photoluminescence Piezospectroscopy to Thermal Barrier Coatings
by Ning Lu, Yanheng Zhang and Wei Qiu
Coatings 2021, 11(2), 181; https://doi.org/10.3390/coatings11020181 - 04 Feb 2021
Cited by 6 | Viewed by 1700
Abstract
Thermal barrier coatings (TBCs) are an indispensable part of the blades used in aeroengines. Under a high-temperature service environment, the thermal oxidation stress at the interface is the main cause of thermal barrier failure. Cr3+ photoluminescence piezospectroscopy has been successfully used to [...] Read more.
Thermal barrier coatings (TBCs) are an indispensable part of the blades used in aeroengines. Under a high-temperature service environment, the thermal oxidation stress at the interface is the main cause of thermal barrier failure. Cr3+ photoluminescence piezospectroscopy has been successfully used to analyze the thermal oxidation stress of TBCs, but systematic and quantitative analysis results for use in data processing are still lacking, especially with respect to the identification of peak positions. The processing methods used to fit spectral data were studied in this work to accurately characterize TBC thermal oxidation stress using Cr3+ photoluminescence spectroscopy. Both physical and numerical experiments were carried out, where Cr3+ photoluminescence spectra were detected from alumina ceramic samples under step-by-step uniaxial loading, and the simulated spectra were numerically deduced from the measured spectral data. Then, the peak shifts were obtained by fitting all spectral data by using Lorentzian, Gaussian and Psd-Voigt functions. By comparing the fitting results and then discussing the generation mechanism, the Lorentzian function—not the Psd-Voigt function that is most widely utilized—was regarded as the most applicable method for the application of Cr3+ photoluminescence piezospectroscopy to TBCs because of its sufficient sensitivity, stability and confidence for quantitative stress analysis. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Graphical abstract

14 pages, 10239 KiB  
Article
Computational Simulations of Nanoconfined Argon Film through Adsorption–Desorption in a Uniform Slit Pore
by Rong-Guang Xu, Qi Rao, Yuan Xiang, Motong Bian and Yongsheng Leng
Coatings 2021, 11(2), 177; https://doi.org/10.3390/coatings11020177 - 02 Feb 2021
Cited by 2 | Viewed by 2245
Abstract
We performed hybrid grand canonical Monte Carlo/molecular dynamics (GCMC/MD) simulations to investigate the adsorption-desorption isotherms of argon molecules confined between commensurate and incommensurate contacts in nanoscale thickness. The recently proposed mid-density scheme was applied to the obtained hysteresis loops to produce a realistic [...] Read more.
We performed hybrid grand canonical Monte Carlo/molecular dynamics (GCMC/MD) simulations to investigate the adsorption-desorption isotherms of argon molecules confined between commensurate and incommensurate contacts in nanoscale thickness. The recently proposed mid-density scheme was applied to the obtained hysteresis loops to produce a realistic equilibrium phase of nanoconfined fluids. The appropriate chemical potentials can be determined if the equilibrium structures predicted by GCMC/MD simulations are consistent with those observed in previously developed liquid-vapor molecular dynamics (LVMD) simulations. With the chemical potential as input, the equilibrium structures obtained by GCMC/MD simulations can be used as reasonable initial configurations for future metadynamics free energy calculations. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

12 pages, 2684 KiB  
Article
Experimental Study on the Thickness-Dependent Hardness of SiO2 Thin Films Using Nanoindentation
by Weiguang Zhang, Jijun Li, Yongming Xing, Xiaomeng Nie, Fengchao Lang, Shiting Yang, Xiaohu Hou and Chunwang Zhao
Coatings 2021, 11(1), 23; https://doi.org/10.3390/coatings11010023 - 27 Dec 2020
Cited by 13 | Viewed by 3689
Abstract
SiO2 thin films are widely used in micro-electro-mechanical systems, integrated circuits and optical thin film devices. Tremendous efforts have been devoted to studying the preparation technology and optical properties of SiO2 thin films, but little attention has been paid to their [...] Read more.
SiO2 thin films are widely used in micro-electro-mechanical systems, integrated circuits and optical thin film devices. Tremendous efforts have been devoted to studying the preparation technology and optical properties of SiO2 thin films, but little attention has been paid to their mechanical properties. Herein, the surface morphology of the 500-nm-thick, 1000-nm-thick and 2000-nm-thick SiO2 thin films on the Si substrates was observed by atomic force microscopy. The hardnesses of the three SiO2 thin films with different thicknesses were investigated by nanoindentation technique, and the dependence of the hardness of the SiO2 thin film with its thickness was analyzed. The results showed that the average grain size of SiO2 thin film increased with increasing film thickness. For the three SiO2 thin films with different thicknesses, the same relative penetration depth range of ~0.4–0.5 existed, above which the intrinsic hardness without substrate influence can be determined. The average intrinsic hardness of the SiO2 thin film decreased with the increasing film thickness and average grain size, which showed the similar trend with the Hall-Petch type relationship. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

15 pages, 3858 KiB  
Article
The Influence of Pulling Up on Micropitting Location for Gears with Interference Fit Connections of Their Conical Surface
by Layue Zhao, Yimin Shao, Minggang Du, Yang Yang and Jixuan Bian
Coatings 2020, 10(12), 1224; https://doi.org/10.3390/coatings10121224 - 14 Dec 2020
Cited by 1 | Viewed by 1991
Abstract
Micropitting is a surface fatigue phenomenon that occurs in Hertzian type of rolling and sliding contact that operates in elastohydrodynamic or boundary lubrication regimes and can progress both in terms of depth and extent. If micropitting continues to propagate, it may result in [...] Read more.
Micropitting is a surface fatigue phenomenon that occurs in Hertzian type of rolling and sliding contact that operates in elastohydrodynamic or boundary lubrication regimes and can progress both in terms of depth and extent. If micropitting continues to propagate, it may result in reducing gear tooth accuracy, increasing dynamic loads and noise. Eventually, it can develop into macropitting and other modes of gear failure such as flank initiated bending fatigue. Micropitting has become a particular problem in the gear surface fatigue. Usually micropitting initiates in the dedendum of the driver and driven at the asperities on the surface. However, the authors found for some gears with interference fit connections of their conical surface, micropitting on the pinion occurs in the addendum. This study attempted to find the reason using a 3D–TCA method based on ISO/TR 15144-1 to predict the micropitting and try to understand the key influence likely to affect micropitting location. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

17 pages, 8183 KiB  
Article
A Study on the Structure of Rock Engineering Coatings Based on Complex Network Theory
by Dayu Ye, Guannan Liu, Feng Gao, Xinmin Zhu and Yuhao Hu
Coatings 2020, 10(12), 1152; https://doi.org/10.3390/coatings10121152 - 26 Nov 2020
Cited by 14 | Viewed by 1648
Abstract
As one of the most basic materials of engineering coatings, rock has complex structural characteristics in its medium space. However, it is still difficult to quantitatively characterize the microstructure of rock coatings, such as connectivity and aggregation degree. For this paper, based on [...] Read more.
As one of the most basic materials of engineering coatings, rock has complex structural characteristics in its medium space. However, it is still difficult to quantitatively characterize the microstructure of rock coatings, such as connectivity and aggregation degree. For this paper, based on a CT-scan model of rock coating, we extracted the network topology of a rock coating sample and verified that its microstructure parameter distribution accords with Barabasi and Albert (BA) scale-free theory. Based on this result, relying on the BA scale-free theory, a dual-porosity network model of rock coating was constructed. We extracted the network structure of the model to verify it, and analyzed the distribution of the microstructure parameters of the model, such as degree distribution, average path length and throat length distribution. At the same time, we analyzed the evolution trend of the permeability of the coating model with the microscopic parameters. Then we discuss the influence of the change of structural parameters on the microstructure of the coating model, and compared with the mainstream rock models at the present stage, the rationality and accuracy of the models are analyzed. This provides a new method for studying the mechanical and permeability properties of engineering coating materials. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

12 pages, 7368 KiB  
Article
Experiment Study on Topological Characteristics of Sandstone Coating by Micro CT
by Feng Gao, Yuhao Hu, Guannan Liu and Yugui Yang
Coatings 2020, 10(12), 1143; https://doi.org/10.3390/coatings10121143 - 24 Nov 2020
Cited by 6 | Viewed by 1571
Abstract
The pore structure is an important factor of tunnel coating failure, cracking and water leakage. Some investigations on the statistical law of pores and pore networks have been conducted, but little quantitative analysis is observed on topology structure of the pore network, and [...] Read more.
The pore structure is an important factor of tunnel coating failure, cracking and water leakage. Some investigations on the statistical law of pores and pore networks have been conducted, but little quantitative analysis is observed on topology structure of the pore network, and even the pore structure of sandstone is complex and cross-scale distributed. Therefore, it is of theoretical and engineering significance to quantitatively characterize the connectivity of the pore network in sandstone. This study proposes a new complex network theory to analyze the three-dimensional nature of pore network structure in sandstone. The topological network structure, such as clustering degree, average path length and the module, which cannot be analyzed by traditional coordination number and fractal dimension methods, is analyzed. Numerical simulation results show that a scale-free network model is more suitable for describing the sandstone pore network than random models. The pore network of sandstone has good uniformity. The connectivity of sandstone pore networks has great potential for permeability enhancement. Therefore, this new method provides a way to deeply understand the pore connectivity characteristics of sandstone and to explore the distribution of crack grids in the arch of tunnel coatings. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

11 pages, 4553 KiB  
Article
Research on Interface Characteristics and Mechanical Properties of 6061 Al Alloy and Q235a Steel by Hot Melt-Explosive Compression Bonding
by Yu-ling Sun, Hong-hao Ma, Ming Yang, Zhao-wu Shen, Ning Luo and Lu-qing Wang
Coatings 2020, 10(11), 1031; https://doi.org/10.3390/coatings10111031 - 26 Oct 2020
Cited by 6 | Viewed by 1840
Abstract
In order to solve the shortcomings of the traditional explosion welding method for direct magnesia-aluminum alloy and steel welding, a processing method of groove hot casting plus explosion compression bonding (HCECB) was put forward, and the related theory of hot-melt metal plus explosion [...] Read more.
In order to solve the shortcomings of the traditional explosion welding method for direct magnesia-aluminum alloy and steel welding, a processing method of groove hot casting plus explosion compression bonding (HCECB) was put forward, and the related theory of hot-melt metal plus explosion bonding was also proposed. Taking 6061 aluminum and Q235a steel as examples, the hot casting plus explosion compression test was carried out by the prefabrication of a dovetail groove on Q235a steel plate and the microstructure and mechanical properties of the interface were analyzed. The results showed that the 6061 aluminum/Q235a steel can be directly combined by the HCECB method. The interface is mainly irregularly microwave-shaped and straight-shaped with no defects, such as melting layer, holes and cracks, found. The hardness of the upper interface of the dovetail groove is larger than that far away from the welding interface, while the hardness of the lower interface is the same as that far away from the interface. The tensile and shear test results show that the shear strength is greater than 80 MPa, which meets the requirements of aluminum-steel composite plate bonding strength. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

14 pages, 3403 KiB  
Article
Effect of Cr Atom Plasma Emission Intensity on the Characteristics of Cr-DLC Films Deposited by Pulsed-DC Magnetron Sputtering
by Guang Li, Yi Xu and Yuan Xia
Coatings 2020, 10(7), 608; https://doi.org/10.3390/coatings10070608 - 28 Jun 2020
Cited by 3 | Viewed by 2672
Abstract
A pulsed-dc (direct current) magnetron sputtering with a plasma emission monitor (PEM) system was applied to synthesize Cr-containing hydrogenated amorphous diamond-like carbon (Cr-DLC) films using a large-size industrial Cr target. The plasma emission intensity of a Cr atom at 358 nm wavelength was [...] Read more.
A pulsed-dc (direct current) magnetron sputtering with a plasma emission monitor (PEM) system was applied to synthesize Cr-containing hydrogenated amorphous diamond-like carbon (Cr-DLC) films using a large-size industrial Cr target. The plasma emission intensity of a Cr atom at 358 nm wavelength was characterized by optical emission spectrometer (OES). C2H2 gas flow rate was precisely adjusted to obtain a stable plasma emission intensity. The relationships between Cr atom plasma emission intensity and the element concentration, cross-sectional morphology, deposition rate, microstructure, mechanical properties, and tribological properties of Cr-DLC films were investigated. Scanning electron microscope and Raman spectra were employed to analyze the chemical composition and microstructure, respectively. The mechanical and tribological behaviors were characterized and analyzed by using the nano-indentation, scratch test instrument, and ball-on-disk reciprocating friction/wear tester. The results indicate that the PEM system was successfully used in magnetron sputtering for a more stable Cr-DLC deposition process. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

11 pages, 6242 KiB  
Article
Effect of Interface Coating on High Temperature Mechanical Properties of SiC–SiC Composite Using Domestic Hi–Nicalon Type SiC Fibers
by Enze Jin, Wenting Sun, Hongrui Liu, Kun Wu, Denghao Ma, Xin Sun, Zhihai Feng, Junping Li and Zeshuai Yuan
Coatings 2020, 10(5), 477; https://doi.org/10.3390/coatings10050477 - 15 May 2020
Cited by 7 | Viewed by 2974
Abstract
Here we show that when the temperature exceeded 1200 °C, the tensile strength drops sharply with change of fracture mode from fiber pull-out to fiber-break. Theoretical analysis indicates that the reduction of tensile strength and change of fracture mode is due to the [...] Read more.
Here we show that when the temperature exceeded 1200 °C, the tensile strength drops sharply with change of fracture mode from fiber pull-out to fiber-break. Theoretical analysis indicates that the reduction of tensile strength and change of fracture mode is due to the variation of residual radial stress on the fiber–matrix interface coating. When the temperature exceeds the preparation temperature of the composites, the residual radial stress on the fiber–matrix interface coating changes from tensile to compressive, leading to the increase of the interface strength with increasing temperature. The fracture behavior of SiC–SiC composites changes from ductile to brittle when the strength of fiber–matrix interface coating exceeds the critical value. Theoretical analysis predicts that the high temperature tensile strength can increase with a decrease in fiber–matrix interface thickness, which is verified by experiments. Full article
(This article belongs to the Special Issue Mechanical Properties of Advanced Multifunctional Coatings)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-14
Back to TopTop