Advances in Hardmetals and Cermets

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: 20 June 2024 | Viewed by 4577

Special Issue Editors


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Guest Editor
Fraunhofer Institute for Ceramic Technologies and Systems IKTS, Dresden, Germany
Interests: hardmetals; cemented carbides; cermets; thermal analysis; gas analysis
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Department of Materials Engineering (MTM), KU Leuven, B-3001 Leuven, Belgium
Interests: development of hardmetals and cermets; powder based additive manufacture of hardmetals and cermets; processing and characterization of ceramics and ceramic composites; combination of thermodynamic simulation and materials development

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Guest Editor
Materials and Processes Department, Industry & Mobility Unit, TECNALIA Research & Innovation, 20009 San Sebastián, Spain
Interests: hard materials; cermets; hardmetals; additive manufacturing; sinter based additive manufacturing; non-conventional sintering processes

Special Issue Information

Dear Colleagues,

Tools made from hard metals, cemented carbides, and/or cermets are essential for the industrial fabrication of many products in life science, automotive, oil and gas, and other areas of manufacturing. With increasing changes in production and the need to machine and shape new materials, new challenges for tool materials are also arising. To address many of them, new frontiers (such as the additive manufacturing of hardmetals and cermets), alternative cobalt- and nickel-free binders, as well as novel WC-free hard phases have to be crossed. Thus, we welcome you to publish your contributions of novel developments in hard metals and cermets within this Special Issue.

Dr. Johannes Pötschke
Dr. Shuigen Huang
Dr. Inigo Agote
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. Metals 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

  • 3D printing
  • additive manufacturing
  • hardmetals
  • cermets
  • cemented carbides
  • alternative binders
  • high entropy alloys
  • high entropy carbides

Published Papers (3 papers)

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Research

12 pages, 9549 KiB  
Article
Effects of Sinter-HIP Temperature on Microstructure and Properties of WC–12Co Produced Using Binder Jetting
by Ivan Goncharov, Marco Mariani, Gian Pietro De Gaudenzi, Anatoliy Popovich, Nora Lecis and Maurizio Vedani
Metals 2024, 14(1), 132; https://doi.org/10.3390/met14010132 - 22 Jan 2024
Viewed by 1052
Abstract
This study investigates the influence of different sinter-HIP temperatures and binder saturation levels on the microstructure and properties of WC–12Co cemented carbide, produced using binder jetting. The sinter-HIP process was performed at 1400 °C, 1460 °C, and 1500 °C and binder saturation levels [...] Read more.
This study investigates the influence of different sinter-HIP temperatures and binder saturation levels on the microstructure and properties of WC–12Co cemented carbide, produced using binder jetting. The sinter-HIP process was performed at 1400 °C, 1460 °C, and 1500 °C and binder saturation levels of 60% and 75% were selected during printing. The binder saturation proved to affect the repeatability of the manufacturing process and the sturdiness of the green models. The increase of the sintering temperature from 1400 °C to 1460 °C is correlated with an increase in the density. Nonetheless, a further raise in temperature to 1500 °C leads to significant grain coarsening without clear advantages in terms of porosity reduction. Both the transverse rupture strength and Vickers hardness increase when the sinter-HIP temperature rises from 1400 °C to 1460 °C, where the typical results for traditionally manufactured WC–12Co are met, with a comparable grain size. The transverse rupture strength and Vickers hardness then decrease for samples treated at 1500 °C. Finally, potential issues in the manufacturing process are identified and correlated with the defects in the final components. Full article
(This article belongs to the Special Issue Advances in Hardmetals and Cermets)
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16 pages, 7544 KiB  
Article
Influence of Alternative Hard and Binder Phase Compositions in Hardmetals on Thermophysical and Mechanical Properties
by Benjamin Hering, Tim Gestrich, Clemens Steinborn, Anne Vornberger and Johannes Pötschke
Metals 2023, 13(11), 1803; https://doi.org/10.3390/met13111803 - 26 Oct 2023
Viewed by 1369
Abstract
Due to the classification of Co as a CMR (carcinogenic, mutagenic, toxic to reproduction) as well as the classification of both Co and WC as CRM (critical raw materials) more and more research is being carried out to investigate possible substitutes for WC-Co [...] Read more.
Due to the classification of Co as a CMR (carcinogenic, mutagenic, toxic to reproduction) as well as the classification of both Co and WC as CRM (critical raw materials) more and more research is being carried out to investigate possible substitutes for WC-Co hardmetals. To directly compare their microstructure as well as mechanical and thermophysical properties, five very different hardmetals were investigated. For this purpose, the compositions WC-Co, WC-FeNiMn, WC-HEA, NbC-Co and HEC-Co were selected in order to investigate alternative binders for cobalt as well as different alternative hard phases for WC. The results of the hardness measurements showed that for the hardmetals with alternative binders (WC-FeNiMn and WC-HEA) hardness values of 1327 HV10 and 1299 HV10 comparable to WC-Co with 1323 HV10 can be achieved. When WC is replaced by HEC as the hard phase, a significantly higher hardness of 1543 HV10 can be obtained, demonstrating the great potential of high-entropy carbides. Furthermore, the hot hardness measurements between RT and 900 °C showed significantly higher values (up to approx. 290 HV10) for the WC-HEA and HEC-Co hardmetals compared to those of WC-Co. However, the fracture toughness of the alternative hardmetals was lower compared to that of conventional WC-Co hardmetals. In terms of thermophysical properties, the results of the hardmetals with alternative binders were close to those of WC-Co. Thus, it can be shown that it is possible to produce alternative hardmetals with comparable properties to WC-Co and that with further optimization they show great potential to replace WC-Co in the near future. Full article
(This article belongs to the Special Issue Advances in Hardmetals and Cermets)
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15 pages, 5710 KiB  
Article
TiCN Cermets with MnFeCoNiCu High Entropy Alloy Binder
by Johannes Pötschke, Mathias von Spalden and Anne Vornberger
Metals 2023, 13(7), 1259; https://doi.org/10.3390/met13071259 - 12 Jul 2023
Cited by 2 | Viewed by 1448
Abstract
Cermets are composites of a TiCN hard phase and a metal binder, typically a mixture of Co and Ni. They offer excellent combinations of hardness and fracture toughness as well as bending strength. Due to the current classification of both Co and Ni [...] Read more.
Cermets are composites of a TiCN hard phase and a metal binder, typically a mixture of Co and Ni. They offer excellent combinations of hardness and fracture toughness as well as bending strength. Due to the current classification of both Co and Ni as CRM as well as CMR there is interest that their use shall be limited and their amount within cermets reduced. Within this study, a novel high entropy alloy-based metal binder system, comprising only elements that are not strong oxide or carbide formers is investigated with regard to their mechanical and microstructural properties they offer in TiCN-based cermets. Within the investigated equimolar MnFeCoNiCu composition, small Cu precipitations are found after sintering. Due to this, the Cu content was systematically reduced, and the maximal solubility estimated at which still a full solid solution occurs. With an optimized Cu content, dense cermets with a single FCC binder phase and with hardness values of up to 1213 HV30 and fracture toughness values of 14.8 MPa·m1/2 could be achieved. Full article
(This article belongs to the Special Issue Advances in Hardmetals and Cermets)
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