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Mechanical Properties and Oxidation Behavior of Protective Coatings
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Mechanical Properties and Oxidation Behavior of Protective Coatings

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Mechanics of Materials".

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 5199

Special Issue Editors

Prof. Dr. Yung-I Chen

E-Mail Website
Guest Editor
Department of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung, Taiwan
Interests: bond coats; diffusion barriers; glass molding technology; high-entropy alloy films; internal oxidation; metallic coatings; nanocomposite nitride films; thin-film metallic glasses; transition metal nitride films
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Chau-Chang Chou

E-Mail Website
Guest Editor
Department of Mechanical & Mechatronic Engineering, National Taiwan Ocean University, Keelung, Taiwan
Interests: tribology; coating; biomedical material; metal forming; corrosion protection

Special Issue Information

Dear Colleagues,

Surface modifications with protective coatings are applied to achieve advanced material characteristics, such as superior mechanical properties, chemical stability, oxidation resistance, and corrosion resistance. Distinct structures, such as multilayered, nanocomposite, and amorphous structures, are utilized in versatile protective coatings. Nitride, carbide, oxide, and boride films are the most familiar materials used as protective coatings. Moreover, protective coatings with multicomponent alloys, such as high-entropy alloys and thin-film metallic glasses are attracting the interest of researchers worldwide. Strengthening mechanisms, including solid-solution strengthening, grain refining, the Hall–Petch effect, and residual stress effect are widely discussed. Oxidation behavior is associated with the lack of grain boundaries and the formation of an inert surface oxide layer. This Special Issue, entitled “Mechanical Properties and Oxidation Behavior of Protective Coatings”, welcomes all original research and critical review articles on the relevant topics.

Prof. Yung-I Chen
Prof. Dr. Chau-Chang Chou
Guest Editors

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Keywords

  • multilayered coatings
  • nanocomposite coatings
  • mechanical properties
  • oxidation behavior
  • corrosion protection
  • tribology behavior
  • diffusion barriers
  • thermal barrier coatings
  • high-entropy alloys
  • thin-film metallic glasses

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Published Papers (3 papers)

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Research

16 pages, 10114 KiB  
Article
Mechanical Properties and Oxidation Behavior of TaWSiN Films
by Chin-Han Tzeng, Li-Chun Chang and Yung-I Chen
Materials 2022, 15(22), 8179; https://doi.org/10.3390/ma15228179 - 17 Nov 2022
Cited by 4 | Viewed by 1445
Abstract
This study explored the structural characteristics, mechanical properties, and oxidation behavior of W-enriched TaWSiN films prepared through co-sputtering. The atomic ratios [W/(W + Ta)] of the as-deposited films maintained a range of 0.77–0.81. The TaWSiN films with a Si content of 0–13 at.% [...] Read more.
This study explored the structural characteristics, mechanical properties, and oxidation behavior of W-enriched TaWSiN films prepared through co-sputtering. The atomic ratios [W/(W + Ta)] of the as-deposited films maintained a range of 0.77–0.81. The TaWSiN films with a Si content of 0–13 at.% were crystalline, whereas the film with 20 at.% Si was amorphous. The hardness and Young’s modulus of crystalline TaWSiN films maintained high levels of 26.5–29.9 GPa and 286–381 GPa, respectively, whereas the hardness and Young’s modulus of the amorphous Ta7W33Si20N40 films exhibited low levels of 18.2 and 229 GPa, respectively. The oxidation behavior of TaWSiN films was investigated after annealing at 600 °C in a 1%O2–Ar atmosphere, and cone-like Ta0.3W0.7O2.85 oxides formed and extruded from the TaWSiN films. Full article
(This article belongs to the Special Issue Mechanical Properties and Oxidation Behavior of Protective Coatings)
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15 pages, 3513 KiB  
Article
Improvement of Tribological Performance of TiAlNbN Hard Coatings by Adding AlCrN
by Yin-Yu Chang and Kai-Chun Huang
Materials 2022, 15(21), 7750; https://doi.org/10.3390/ma15217750 - 3 Nov 2022
Cited by 7 | Viewed by 1789
Abstract
In tribological applications, the degradation of alloy nitride coatings is an issue of increasing concern. The drawbacks of monolayer hard coatings can be overcome using a multilayer coating system. In this study, single-layer TiAlNbN and multilayer TiAlNbN/AlCrN coatings with AlCrN layer addition into [...] Read more.
In tribological applications, the degradation of alloy nitride coatings is an issue of increasing concern. The drawbacks of monolayer hard coatings can be overcome using a multilayer coating system. In this study, single-layer TiAlNbN and multilayer TiAlNbN/AlCrN coatings with AlCrN layer addition into TiAlNbN were prepared by cathodic arc evaporation (CAE). The multilayer TiAlNbN/AlCrN showed B1 NaCl structure, and the columnar structure continued from the bottom interlayer of CrN to the top multilayers without interruption. After AlCrN addition, the TiAlNbN/AlCrN coating consisted of TiAlNbN and AlCrN multilayers with a periodic thickness of 13.2 nm. The layer thicknesses of the TiAlNbN and AlCrN were 7 nm and 6.2 nm, respectively. The template growth of the TiAlNbN and AlCrN sublayers stabilized the cubic phases. The introduction of bottom CrN and the TiAlNbN/CrN transition layers possessed com-position-gradient that improved the adhesion strength of the coatings. The hardness of the deposited TiAlNbN was 30.2 ± 1.3 GPa. The TiAlNbN/AlCrN had higher hardness of 31.7 ± 3.5 GPa and improved tribological performance (wear rate = 8.2 ± 0.6 × 10−7 mm3/Nm) than those of TiAlNbN, which were because the multilayer architecture with AlCrN addition effectively resisted abrasion wear. Full article
(This article belongs to the Special Issue Mechanical Properties and Oxidation Behavior of Protective Coatings)
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9 pages, 5283 KiB  
Article
Effects of Carbon Doping and DC Bias Voltage on Microstructure and Mechanical Properties of AlCrCN Films Synthesized via HiPIMS
by Jian-Fu Tang, Shang-Hao Wang, Fu-Chi Yang and Chi-Lung Chang
Materials 2022, 15(16), 5729; https://doi.org/10.3390/ma15165729 - 19 Aug 2022
Cited by 1 | Viewed by 1515
Abstract
This work compares the hardness and adhesion properties of AlCrN and AlCrCN hard coatings synthesized via HiPIMS using Al70Cr30 and Cr targets. The hardness and adhesion properties of AlCrCN films were optimized by performing deposition under various C2H [...] Read more.
This work compares the hardness and adhesion properties of AlCrN and AlCrCN hard coatings synthesized via HiPIMS using Al70Cr30 and Cr targets. The hardness and adhesion properties of AlCrCN films were optimized by performing deposition under various C2H2 flow rates (5, 8, 10, 13, 15, or 20 sccm) and DC bias voltages (−40, −60, −80, −100, or −120 V). EPMA results clearly indicated that the carbon content was increased from 1.9 to 12.2 at.% with increasing C2H2 flow rate from 5 to 20 sccm. XPS results confirmed a various content of chemical bonds (Cr-N, C-N, sp2, and sp3) with various C2H2 flow rate. Grain and columnar refinement in AlCrCN were derived from XRD, TEM, and SAED results. The higher hardness (28.6 GPa) and Young’s modulus (358 GPa) were obtained using an C2H2 flow rate of 5 sccm and a bias voltage of −60 V. Both of which subsequently decreased to 13.5 GPa and 212 GPa, respectively. This can be attributed to the C-N bond inhibiting the development of metal-N bonds. Increasing the bias voltage to −120 V increased the hardness to 32.9 GPa and the Young’s modulus to 372 GPa. Note that the application of bias voltage to enhance hardness should also be applicable to carbon-doped AlCrN films as well. All samples presented good adhesion characteristics (class 1; ISO26443:2008-06). Full article
(This article belongs to the Special Issue Mechanical Properties and Oxidation Behavior of Protective Coatings)
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