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Crystals
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Metal Matrix Composite Materials and Coatings
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Metal Matrix Composite Materials and Coatings

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Hybrid and Composite Crystalline Materials".

Deadline for manuscript submissions: closed (20 March 2023) | Viewed by 4989

Special Issue Editors

Dr. Dariusz Bartkowski

E-Mail Website
Guest Editor
Faculty of Mechanical Engineering, Poznan University of Technology, Poznan, Poland
Interests: metal matrix composite coatings; carbides; microstructure; laser processing; laser cladding; wear resistance; hard materials
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Xiaochun Li

E-Mail Website
Guest Editor
Raytheon Chair in Manufacturing, Department of Mechanical and Aerospace Engineering and Department of Materials Science and Engineering, University of California, Los Angeles, CA, USA
Interests: nanotech metallurgy; solidification processing; nanotechnology-enabled phase control; metal matrix nanocomposites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Metal matrix composite materials and coatings have unique properties, such as high hardness and wear resistance while maintaining high corrosion resistance. These properties are often not achievable with conventional materials. Reinforcing of materials using micro- and nano- particles during laser processing or by the methods of additive manufacturing can be widely used in industrial applications. During all these processes, interesting phenomena of crystal growth as well as the formation of new microstructure and phases can be observed.

We invite researchers to contribute to this Special Issue "Metal Matrix Composite Materials and Coatings" which is intended to serve as a unique multidisciplinary forum focused on the production, properties and application of composite materials and composite coatings.

The potential topics include, but are not limited to:

  • laser processing techniques of coatings containing carbides,
  • additive manufacturing,
  • nano composite,
  • testing the properties of composite materials and composite coatings,
  • crystal growth analysis in modern composites and composite coatings,
  • microstructure and phase analysis of composite materials and composite coatings.

Dr. Dariusz Bartkowski
Prof. Dr. Xiaochun Li
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. Crystals 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

  • MMC coatings
  • carbides
  • microstructure
  • laser processing
  • composite

Published Papers (3 papers)

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Research

14 pages, 3649 KiB  
Article
Impact of Using Tungsten, Cobalt, and Aluminum Additives on the Tribological and Mechanical Properties of Iron Composites
by Moustafa M. Mohammed, Nashmi H. Alrasheedi, Omayma A. El-Kady, Joy Djuansjah, Fadl A. Essa and Ammar H. Elsheikh
Crystals 2023, 13(3), 395; https://doi.org/10.3390/cryst13030395 - 24 Feb 2023
Cited by 1 | Viewed by 1147
Abstract
The effect of tungsten, aluminum, and cobalt on the mechanical properties of iron-based composites prepared by powder technology was studied. Five samples with different contents of tungsten, aluminum, and cobalt were established. The five samples have the following chemical compositions: (I) full iron [...] Read more.
The effect of tungsten, aluminum, and cobalt on the mechanical properties of iron-based composites prepared by powder technology was studied. Five samples with different contents of tungsten, aluminum, and cobalt were established. The five samples have the following chemical compositions: (I) full iron sample, (II) 5wt.% tungsten, (III) 5wt.% tungsten-4wt.% cobalt-1wt.% aluminum, (IV) 5wt.% tungsten-2.5wt.% cobalt-2.5wt.% aluminum, and (V) 5wt.% tungsten-1wt.% cobalt-4wt.% aluminum. The mixed composite powders were prepared by mechanical milling, in which 10:1 ball to powder ratio with 350 rpm for 20 h was cold compacted by a diaxial press under 80 bars, then sintered at temperatures ranging from 1050 °C to 1250 °C in an argon furnace. The samples were characterized mechanically and physically using XRD, SEM, a density measuring device, a hardness measuring device, a compression test device, and a tribological device for wear and friction tests. XRD results refer to the formation of different intermetallic compounds such as Fe7W6, Al5Co2, Fe2W2Co and Co7W6 with the main peaks of Fe. The good combination of tribological and mechanical properties was recorded for sample number five, which contained 5% W, 4% Al, 1% Co and Fe base, where it obtained the highest wear resistance, largest hardness, acceptable compressive strength, and lowest friction coefficient due to the good combination of hard and anti-friction intermetallic action compared with the other samples. This sample is a good candidate for applications which require high wear resistance and a moderate friction coefficient accompanied with high toughness, like bearing materials for both static and dynamic loading with superior mechanical and tribological properties. Full article
(This article belongs to the Special Issue Metal Matrix Composite Materials and Coatings)
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13 pages, 3836 KiB  
Article
Comparative Characterization of the TiN and TiAlN Coatings Deposited on a New WC-Co Tool Using a CAE-PVD Technique
by Alecs Andrei Matei, Ramona Nicoleta Turcu, Ion Pencea, Eugen Herghelegiu, Mircea Ionut Petrescu and Florentina Niculescu
Crystals 2023, 13(1), 112; https://doi.org/10.3390/cryst13010112 - 07 Jan 2023
Cited by 6 | Viewed by 1768
Abstract
The main objective of this work was to assess and compare the structure and mechanical properties of the TiN and TiAlN coatings deposited on a new WC-Co tool using the cathodic arc evaporation vacuum deposition (CAE-PVD) technique. The cutting tool was sintered at [...] Read more.
The main objective of this work was to assess and compare the structure and mechanical properties of the TiN and TiAlN coatings deposited on a new WC-Co tool using the cathodic arc evaporation vacuum deposition (CAE-PVD) technique. The cutting tool was sintered at high temperature and high pressure using a powder tungsten carbide matrix ligated with cobalt (WC-Co). Powdered grain growth inhibitors (TiC, TaC, and NbC) were admixed into the matrix to enhance its strength and to facilitate the adhesion of the Ti base coatings. Detailed scanning electron microscopy with energy-dispersive spectrometry (SEM-EDS) and X-ray diffraction (XRD) analyses were performed, aiming to substantiate the effectiveness of the inhibitor additions. XRD data were thoroughly exploited to estimate the phase contents, average crystallite sizes (D), coating thicknesses (t), texture coefficients (Thkl), and residual stress levels (σ). Atomic force microscopy (AFM) was used to calculate the average roughness (Ra) and the root mean square (Rq). The microhardness (µHV) was measured using the Vickers method. The TiAlN characteristics (D = 55 nm, t = 3.6 μm, T200 = 1.55, µHV = 3187; σ = −2.8 GPa, Ra = 209 nm, Rq = 268 nm) compared to TiN ones (D = 66 nm, t = 4.3 μm, T111 = 1.52, µHV = 2174; σ = +2.2 GPa, Ra = 246 nm, Rq = 309 nm) substantiate the better adequacy of the TiAlN coating for the WC-Co substrate. The structural features and data on the TiN and TiAlN coatings, the tool type, the different stress kinds exerted into these coatings, and the way of discrimination of the coating adequacy are the novelties addressed in the paper. Full article
(This article belongs to the Special Issue Metal Matrix Composite Materials and Coatings)
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12 pages, 3626 KiB  
Article
Effect of Thermochemical Boronizing of Alumina Surface on the Borate Crystals Growth and Interaction with Nickel and Nickel Alloy
by Jelena Škamat, Aleksandr Lebedev, Olegas Černašėjus and Rimvydas Stonys
Crystals 2023, 13(1), 4; https://doi.org/10.3390/cryst13010004 - 20 Dec 2022
Cited by 1 | Viewed by 1714
Abstract
Wettability at the metal-ceramic interface is highly important for the development of modern composite materials. Poor wettability by metal melts restricts the use of alumina in protective metal matrix composite (MMC) coatings. In the present experimental study, the possibility to modify wetting properties [...] Read more.
Wettability at the metal-ceramic interface is highly important for the development of modern composite materials. Poor wettability by metal melts restricts the use of alumina in protective metal matrix composite (MMC) coatings. In the present experimental study, the possibility to modify wetting properties of alumina by thermochemical surface boronizing was investigated. The results of SEM, EDS, XRD and XPS characterisation of surfaces revealed the formation of oxygen containing Al–B compounds identified as aluminium borates (Al18B4O33/Al4B2O9); no signs of non-oxide Al–B compounds were observed. The shape of the single splats deposited on the boronized alumina surface by the thermal spray and re-melted in the furnace revealed that significant wetting improvement by self-fluxing nickel alloy did not occur. However, the improvement of adhesion between the nickel/nickel alloy and Al2O3 surface was obtained due to formation of an intermediate layer consisting of B, O, Al and Si between the metal and ceramic surfaces at the presence of some silicon at the modified surfaces. The presented study demonstrates that the thermochemical boronizing of alumina in amorphous boron medium is a simple method to obtain a thin aluminium borate layer consisting of oriented nano-rod-like crystals, whose growing direction is predetermined by the orientation of the alumina grains’ faces at surface. Full article
(This article belongs to the Special Issue Metal Matrix Composite Materials and Coatings)
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