Special Issue "Synthesis, Properties and Applications of Intermetallics, Ceramic and Cermet Coatings"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Thin Films and Interfaces".

Deadline for manuscript submissions: 31 August 2021.

Special Issue Editor

Prof. Dr. Cezary Senderowski
E-Mail Website
Guest Editor
Departament of Materials and Machinery Technology, University of Warmia and Mazury, Oczapowskiego 11 St., 10-719 Olsztyn, Poland
Interests: intermetallics; microstructure characterization; phase transformation; multiphase nanocomposite intermetallics/ceramics/cermet coatings; multifunctional hybrid coating systems; thermophysical properties; elastic properties characterization up to 1000 °C; thermal stability; residual stresses; adhesive, wear and corrosion properties characterization; D-gun and HVOF ultrasonic metallization spraying; powders metallurgy
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Special Issue Information

Dear Colleagues,

Production of intermetallics’ and ceramics’ protective coatings can be simple, beneficial, and highly predictable. However, comprehensive possibilities for the synthesis and application of this type of coatings, also with the use of intermediate layers, are limited by the technological conditions of the synthesis process and coexisting physical phenomena. The physicochemical, thermophysical, and structural properties of the coating materials can frequently be subjected to changes in situ in the synthesis conditions—also with the possibility of formation of new ones phases in relation to the feedstock powder material.

This Special Issue will focus on various conventional synthesis methods of different intermetallics and ceramics coatings with thermal (D-gun, HVOF, ARC and plasma) spraying, cold spraying, PVD, CVD, and additive manufacturing processes (LENS and other). The main subtopics include experimental research on coating production and analysis of physicochemical and thermo-gasokinetic phenomena under various conditions of the synthesis processes relating to a specific method of production.

A unique problem to be considered is analyzing the influence of synthesis conditions on mechanisms of deformation and strengthening of nominally brittle intermetallics and ceramics phases during synthesis processes of the powder particles, especially during the supersonic flow of stream at D-gun spraying and HVOF process. This description includes a comprehensive analysis of the structural transformation of powder particles into elementary grains in the synthesized structure of intermetallic, ceramic. and cermet coatings.

The analysis of the problem can take into account the synthesis conditions (such as the impact of particle velocity, the temperature, and dynamic pressure of the gaseous stream) on the chemical and phase, composition, crystallographic and morphological microtexture, size of the crystallites, and the state of the grain boundaries in the particles and obtained coatings, as well as the degree of superstructure disorder with identification of nano/ultrafine grain and subgrain areas, dislocation, and antiphase domains. In the thermophysical property analysis, both for the feedstock powder material and coatings, other phenomena are subject to consideration (i.e., the exchange of momentum and convective heat transfer, as well as the thermal effects of phase changes after melting of powder particles), including analytical and numerical analysis.

The conducted considerations may also concern the analysis of the feedstock powder properties used in the synthesis process of the coatings, with taking into account the limitations of heat transport efficiency resulting mainly from the conditions of the synthesis process and the structural conditions of the powder particles, which often show an inhomogeneous multiphase structure also involving pores.

It is also important to analyze the functional properties of the produced coatings, including the residual stress, adhesive strength, thermal stability, corrosion resistance, and abrasive wear mechanisms, as well as the geometric structure analysis of the surface layer of the coatings together with fractal characteristics using the root mean square (RMS) method.

Thus, in this Special Issue, it will be possible to make a comprehensive assessment of how specific synthesis conditions using different methods can affect the structure and performance properties of multiphase intermetallic, ceramic, and cermet coatings in terms of their comprehensive use.

It is my pleasure to invite you to submit a manuscript for this Special Issue. Full papers, communications, and reviews are all welcome.

Prof. Dr. Cezary Senderowski
Guest Editor

Manuscript Submission Information

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Keywords

  • multiphase nanocomposite intermetallics
  • ceramics and cermet coatings
  • phase transformation
  • multifunctional hybrid coating systems
  • phase transformation
  • thermophysical properties
  • SEM/ EDS/ EBSD and TEM microstructure analysis
  • residual stresses
  • thermal stability
  • D-gun and HVOF ultrasonic metallization spraying
  • ARC, plasma, and cold spraying
  • PVD and CVD synthesis process
  • additive manufacturing
  • powder characterization

Published Papers (4 papers)

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Research

Open AccessArticle
A Proposal for a Composite with Temperature-Independent Thermophysical Properties: HfV2–HfV2O7
Materials 2020, 13(21), 5021; https://doi.org/10.3390/ma13215021 - 07 Nov 2020
Viewed by 584
Abstract
The HfV2–HfV2O7 composite is proposed as a material with potentially temperature-independent thermophysical properties due to the combination of anomalously increasing thermoelastic constants of HfV2 with the negative thermal expansion of HfV2O7. Based on [...] Read more.
The HfV2–HfV2O7 composite is proposed as a material with potentially temperature-independent thermophysical properties due to the combination of anomalously increasing thermoelastic constants of HfV2 with the negative thermal expansion of HfV2O7. Based on literature data, the coexistence of both a near-zero temperature coefficient of elasticity and a coefficient of thermal expansion is suggested for a composite with a phase fraction of approximately 30 vol.% HfV2 and 70 vol.% HfV2O7. To produce HfV2–HfV2O7 composites, two synthesis pathways were investigated: (1) annealing of sputtered HfV2 films in air to form HfV2O7 oxide on the surface and (2) sputtering of HfV2O7/HfV2 bilayers. The high oxygen mobility in HfV2 is suggested to inhibit the formation of crystalline HfV2–HfV2O7 composites by annealing HfV2 in air due to oxygen-incorporation-induced amorphization of HfV2. Reducing the formation temperature of crystalline HfV2O7 from 550 °C, as obtained upon annealing, to 300 °C using reactive sputtering enables the synthesis of crystalline bilayered HfV2–HfV2O7. Full article
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Open AccessArticle
Thermal Barrier Stability and Wear Behavior of CVD Deposited Aluminide Coatings for MAR 247 Nickel Superalloy
Materials 2020, 13(17), 3863; https://doi.org/10.3390/ma13173863 - 01 Sep 2020
Cited by 4 | Viewed by 656
Abstract
In this paper, aluminide coatings of various thicknesses and microstructural uniformity obtained using chemical vapor deposition (CVD) were studied in detail. The optimized CVD process parameters of 1040 °C for 12 h in a protective hydrogen atmosphere enabled the production of high density [...] Read more.
In this paper, aluminide coatings of various thicknesses and microstructural uniformity obtained using chemical vapor deposition (CVD) were studied in detail. The optimized CVD process parameters of 1040 °C for 12 h in a protective hydrogen atmosphere enabled the production of high density and porosity-free aluminide coatings. These coatings were characterized by beneficial mechanical features including thermal stability, wear resistance and good adhesion strength to MAR 247 nickel superalloy substrate. The microstructure of the coating was characterized through scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) analysis. Mechanical properties and wear resistance of aluminide coatings were examined using microhardness, scratch test and standardized wear tests, respectively. Intermetallic phases from the Ni-Al system at specific thicknesses (20–30 µm), and the chemical and phase composition were successfully evaluated at optimized CVD process parameters. The optimization of the CVD process was verified to offer high performance coating properties including improved heat, adhesion and abrasion resistance. Full article
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Open AccessArticle
Influence of Anodization Temperature on Geometrical and Optical Properties of Porous Anodic Alumina(PAA)-Based Photonic Structures
Materials 2020, 13(14), 3185; https://doi.org/10.3390/ma13143185 - 16 Jul 2020
Cited by 2 | Viewed by 526
Abstract
In this work, the influence of a wide range anodizing temperature (5–30 °C) on the growth and optical properties of PAA-based distributed Bragg reflector (DBR) was studied. It was demonstrated that above 10 °C both structural and photonic properties of the DBRs strongly [...] Read more.
In this work, the influence of a wide range anodizing temperature (5–30 °C) on the growth and optical properties of PAA-based distributed Bragg reflector (DBR) was studied. It was demonstrated that above 10 °C both structural and photonic properties of the DBRs strongly deteriorates: the photonic stop bands (PSBs) decay, broaden, and split, which is accompanied by the red shift of the PSBs. However, at 30 °C, new bands in transmission spectra appear including one strong and symmetric peak in the mid-infrared (MIR) spectral region. The PSB in the MIR region is further improved by a small modification of the pulse sequence which smoothen and sharpen the interfaces between consecutive low and high refractive index layers. This is a first report on PAA-based DBR with a good quality PSB in MIR. Moreover, it was shown that in designing good quality DBRs a steady current recovery after subsequent application of high potential (UH) pulses is more important than large contrast between low and high potential pulses (UH-UL contrast). Smaller UH-UL contrast helps to better control the current evolution during pulse anodization. Furthermore, the lower PSB intensity owing to the smaller UH-UL contrast can be partially compensated by the higher anodizing temperature. Full article
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Open AccessCommunication
A Novel Microstructural Evolution Model for Growth of Ultra-Fine Al2O3 Oxides from SiO2 Silica Ceramic Decomposition during Self-Propagated High-Temperature Synthesis
Materials 2020, 13(12), 2821; https://doi.org/10.3390/ma13122821 - 23 Jun 2020
Viewed by 606
Abstract
In this paper, experimental verification of the microstructural evolution model during sintering of aluminum, iron and particulate mullite ceramic powders using self-propagated high-temperature synthesis (SHS) was performed. The powder mixture with 20% wt. content of reinforcing ceramic was investigated throughout this research. The [...] Read more.
In this paper, experimental verification of the microstructural evolution model during sintering of aluminum, iron and particulate mullite ceramic powders using self-propagated high-temperature synthesis (SHS) was performed. The powder mixture with 20% wt. content of reinforcing ceramic was investigated throughout this research. The mixed powders were cold pressed and sintered in a vacuum at 1030 °C. The SHS reaction between sintered feed powders resulted in a rapid temperature increase from the heat generated. The temperature increase led to the melting of an aluminum-based metallic liquid. The metallic liquid infiltrated the porous SiO2 ceramics. Silicon atoms were transited into the intermetallic iron–aluminum matrix. Subsequently, a ternary matrix from the Fe–Al–Si system was formed, and synthesis of the oxygen and aluminum occurred. Synthesis of both these elements resulted in formation of new, fine Al2O3 precipitates in the volume of matrix. The proposed microstructural evolution model for growth of ultra-fine Al2O3 oxides from SiO2 silica ceramic decomposition during SHS was successfully verified through scanning electron microscopy (SEM), X-ray energy-dispersive spectroscopy (EDS) analysis and X-ray diffraction (XRD). Full article
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