Special Issue "New Progresses in the Development, Microstructure and Properties of Ceramic-Metal Composites (Cermets)"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced and Functional Ceramics and Glasses".

Deadline for manuscript submissions: 10 August 2022 | Viewed by 2790

Special Issue Editor

Prof. Dr. Ernesto Chicardi
E-Mail Website
Guest Editor
Departamento de Ingeniería y Ciencia de los Materiales y del Transporte, University of Seville, Sevilla, Spain
Interests: cermets; cemented carbides; powder metallurgy; ceramics; combustion reactions; high entropy alloys

Special Issue Information

Dear Colleagues,

Ceramic–metal composites (cermets) are materials formed by at least a hard ceramic and a tough metallic binder phase, designed to achieve specific properties for particular applications when it is impossible to obtain them by monophasic materials.

Particularly, for the machining industry, the cermet cutting tools based on WC–Co (usually called hard metal) are widely employed due to their exceptional toughness and damage tolerance under cyclic loadings. However, they fail when it comes to the most demanding applications, such as high-speed machining and difficult-to-cut materials, because of their lack of chemical stability and oxidation resistance. Alternative to them are cermets based on TiC and Ti(C,N) with high wear resistance, chemical stability, and mechanical strength at high temperature. Nevertheless, to become a real alternative to WC–Co, their fracture toughness and damage tolerance must be significantly improved.

Therefore, this Special Issue is focused on contributions related to experimental and theoretical studies based on the design, production technologies, development, processing, synthesis, and characterization of cermets, with new clear progresses in their microstructure and/or properties that increase their potential role as materials to be successfully applied for high-speed machining or similar applications.

Special attention will be considered for cermets based on High Entropy Alloys (HEAs) and/or High Entropy Ceramics (HECs) and, in addition, contributions focused on other different cermets would also be welcome.

Prof. Dr. Ernesto Chicardi
Guest Editor

Manuscript Submission Information

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Keywords

  • Cermets
  • Cemented carbides
  • Hard metals
  • High entropy alloys
  • Binder
  • Ceramic
  • Titanium carbide
  • Titanium carbonitride
  • Powder metallurgy
  • High-speed machining

Published Papers (3 papers)

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Research

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Article
The Effect of the Substrate on the Microstructure and Tribological Properties of Cold Sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) Cermet Coatings
Materials 2022, 15(3), 994; https://doi.org/10.3390/ma15030994 - 27 Jan 2022
Viewed by 521
Abstract
In this work, the effect of the substrate, Al 7075 alloy and 1H18NT9 stainless steel, on the microstructure and tribological properties of cold sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) coatings was investigated. Both coatings were dense and did not reveal any discontinuities at [...] Read more.
In this work, the effect of the substrate, Al 7075 alloy and 1H18NT9 stainless steel, on the microstructure and tribological properties of cold sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) coatings was investigated. Both coatings were dense and did not reveal any discontinuities at the interfaces. They had similar Cr3C2 and graphite contents. Their microstructures showed a variety of grain sizes of the matrix phase between the inner part of the splat, showing large ones, and their boundaries, where elongated and nanostructured grains were formed during the deposition process. The coating deposited on the steel substrate revealed a slightly higher hardness and lower abrasive wear with the Al2O3 loose abrasive particles. The force required to destroy the durability of the coating–steel substrate system in the three-point bending test was higher than those of the other ones. The cermet deposit cold sprayed on steel and examined at 25 °C under 10 N revealed the best wear resistance and the lowest friction coefficient. Full article
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Article
Performance of Ceramic-Metal Composites as Potential Tool Materials for Friction Stir Welding of Aluminium, Copper and Stainless Steel
Materials 2020, 13(8), 1994; https://doi.org/10.3390/ma13081994 - 24 Apr 2020
Cited by 7 | Viewed by 1093
Abstract
The aim of the research was to disclose the performance of ceramic-metal composites, in particular TiC-based cermets and WC-Co hardmetals, as tool materials for friction stir welding (FSW) of aluminium alloys, stainless steels and copper. The model tests were used to study the [...] Read more.
The aim of the research was to disclose the performance of ceramic-metal composites, in particular TiC-based cermets and WC-Co hardmetals, as tool materials for friction stir welding (FSW) of aluminium alloys, stainless steels and copper. The model tests were used to study the wear of tools during cutting of metallic workpiece materials. The primary focus was on the performance and degradation mechanism of tool materials during testing under conditions simulating the FSW process, in particular the welding process temperature. Carbide composites were produced using a common press-and-sinter powder metallurgy technique. The model tests were performed on a universal lathe at the cutting speeds enabling cutting temperatures comparable the temperatures of the FSW of aluminium alloys, stainless steels and pure copper. The wear rate of tools was evaluated as the shortening of the length of the cutting tool nose tip and reaction diffusion tests were performed for better understanding of the diffusion-controlled processes during tool degradation (wear). It was concluded that cermets, in particular TiC-NiMo with 75–80 wt.% TiC, show the highest performance in tests with counterparts from aluminium alloy and austenitic stainless steel. On the other hand, in the model tests with copper workpiece, WC-Co hardmetals, in particular composites with 90–94 wt.% WC, outperform most of TiC-based cermet, including TiC-NiMo. Tools from ceramic-metal composites wear most commonly by mechanisms based on adhesion and diffusion. Full article
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Review

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Review
Ti(C,N) and WC-Based Cermets: A Review of Synthesis, Properties and Applications in Additive Manufacturing
Materials 2021, 14(22), 6786; https://doi.org/10.3390/ma14226786 - 10 Nov 2021
Cited by 2 | Viewed by 670
Abstract
In recent years, the use of cermets has shown significant growth in the industry due to their interesting features that combine properties of metals and ceramics, and there are different possible types of cermets, depending on their composition. This review focuses on cemented [...] Read more.
In recent years, the use of cermets has shown significant growth in the industry due to their interesting features that combine properties of metals and ceramics, and there are different possible types of cermets, depending on their composition. This review focuses on cemented tungsten carbides (WC), and tungsten carbonitrides (WCN), and it is intended to analyze the relationship between chemical composition and processing techniques of these materials, which results in their particular microstructural and mechanical properties. Moreover, the use of cermets as a printing material in additive manufacturing or 3D printing processes has recently emerged as one of the scenarios with the greatest projection, considering that they manufacture parts with greater versatility, lower manufacturing costs, lower raw material expenditure and with advanced designs. Therefore, this review compiled and analyzed scientific papers devoted to the synthesis, properties and uses of cermets of TiC and WC in additive manufacturing processes reported thus far. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Simple approach to the fabrication of lanthanum orthoniobates and nanocomposites with NiCu nanoparticles using supercritical isopropanol

Authors: D. Altynbekova1, Yu. Bespalko2*, K.  Valeev2, N. Eremeev2, T.  Krieger2, B. Massalimova1, V. Sadykov2,3

Affiliations:

1M.Kh. DulatyTaraz State University, Taraz, Kazakhstan;

2Boreskov Institute of Catalysis, Novosibirsk, Russia

3Novosibirsk State University, Novosibirsk, Russia

Rare-earth orthoniobates are a promising group of materials attractive for design of nanocomposite hydrogen separation membrane  due to  a perspective type of proton conductivity, good mechanical properties, high stability in H2O- and CO2-containing atmospheres. Many efforts have been made to improve the conductivity of orthoniobates by single- or multi-element doping. In general, the promising way is synthesis of nanocomposites with transition metals (Cu, Ni, Cu-Ni alloys) and their oxides with high electronic conductivity.  For the first time, lanthanum orthoniobates and nanocomposites with NiCu nanoparticles were synthesized using alcohol solutions of salts of the corresponding metals by the solvothermal method in a flow reactor in a supercritical isopropanol medium. This method allows us to obtain single-phase oxides of La0.99Сa0.01NbO4–δ. The introduction of doping titanium cation did not allow to obtain single-phase La0.99Сa0.01Nb1-xTixO4–δ, impurities of lanthanum methaniobates and La2Ti2O7 were found. As the amount of doping titanium cations increases, the amount of impurity phases grows. 

Calcined powders and gastight pellets of orthoniobates and nanocomposites  were characterized by X-ray phase analysis, Raman spectroscopy, scanning and transmission electron microscopy. Transport characteristics were investigated by Van der Pauw techniques varying measurements temperature in dry and wet atmospheres. The oxygen mobility was analyzed by the oxygen  isotope heteroexchange with C18O2. Improved oxygen mobility and increased  conductivity were demonstrated for  nanocomposites with doping titanium cations.
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