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Powder Metallurgy: Materials and Processing II
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Powder Metallurgy: Materials and Processing II

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

Deadline for manuscript submissions: closed (20 December 2023) | Viewed by 2463

Special Issue Editors

Dr. Dina V. Dudina

E-Mail Website
Guest Editor
Lavrentyev Institute of Hydrodynamics, Siberian Branch of the Russian Academy of Sciences, Lavrentyev Ave. 15, 630090 Novosibirsk, Russia
Interests: powder metallurgy; field-assisted sintering; metal matrix composites; powder processing; thermal spraying
Special Issues, Collections and Topics in MDPI journals
Dr. Arina V. Ukhina

E-Mail Website
Guest Editor
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Kutateladze str. 18, 630090 Novosibirks, Russia
Interests: sintering; hot pressing; surface modification; metal–diamond composites; characterization of materials by X-ray diffraction
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

We would like to invite submissions to a Special Issue of Materials titled “Powder Metallurgy: Materials and Processing II”, the focus of which is the fundamental and applied aspects of materials fabrication by powder metallurgy.

Powder metallurgy has a long and interesting history. The Egyptian iron artefacts were fabricated through a re-carburization process: iron oxide was heated in a reducing fire (charcoal), then iron agglomerates were shaped into dense objects by hot hammering and reheated to induce the interaction with carbon and form steel. In India, both metal powder fabrication and sintering were established by 400 AD. In the 19th century, the production of platinum by powder metallurgy was realized thanks to research conducted by P. G. Sobolevskii and W. H. Wollaston. The fabrication of malleable platinum was described by Sobolevskii in Gornyi Zhurnal (Mining Journal) in 1827. The essence of the process was in the pressing of the platinum sponge into disks followed by their heating under pressure. In 1908, Coolidge developed a long-lasting ductile tungsten filament. It was formed by direct-current sintering of a pressed powder followed by hot working and drawing into a wire.

The powder metallurgy routes offer flexibility for the materials’ microstructure design, as, during sintering, the major fraction of the material remains in the solid state. At present, with the availability of modern technological equipment and powerful analytical tools, in-depth investigations of the material formation mechanisms operating during sintering are possible. A wide range of materials, including alloys and composites, are currently produced by powder metallurgy to achieve new levels of properties and performance.

The topics to be covered in this Special Issue include, but are not limited to:

  • Selection of sintering parameters for achieving desired microstructures and properties;
  • Microstructure formation mechanisms in sintered materials, including reactively sintered materials;
  • The influence of the powder morphology and microstructure on their sintering behavior;
  • Characterization of interfaces in sintered materials;
  • Sintered metals, alloys, and composites with attractive mechanical and thermophysical properties;
  • Structural and functional materials produced by powder metallurgy—new approaches to microstructure control;
  • Advanced sintering methods, including spark plasma sintering;
  • Comparative investigations of materials obtained by different powder sintering/consolidation methods.

We hope to receive high-quality articles, communications, and reviews reporting advancements in the fascinating field of powder metallurgy.

Sincerely,

Dr. Dina V. Dudina
Dr. Arina V. Ukhina
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. Materials is an international peer-reviewed open access semimonthly 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

  • powder metallurgy
  • conventional sintering
  • spark plasma sintering
  • hot pressing
  • microstructure
  • grain growth
  • interface
  • grain boundary
  • metals
  • alloys
  • composites

Related Special Issue

Published Papers (3 papers)

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Research

10 pages, 5205 KiB  
Communication
Large-Scale Fabrication of SiC-TiC@C Powders via Modified Molten Salt Shielding Synthesis Technique and Their Effect on the Properties of Al2O3-MgO Castables
by Yong Li, Yicheng Yin, Jing Chen, Xiaoxu Kang, Shihao Kang, Haoxuan Ma, Shaowei Zhang and Quanli Jia
Materials 2023, 16(17), 5895; https://doi.org/10.3390/ma16175895 - 29 Aug 2023
Viewed by 599
Abstract
Graphite flakes are commonly used to fabricate carbon-based refractories owing to their superior properties, including better corrosion resistance and thermal shock resistance (TSR); unfortunately, their insufficient water-wettability has remarkably hindered their application in castables. Aiming to enhance their water-wettability, a facile and low-cost [...] Read more.
Graphite flakes are commonly used to fabricate carbon-based refractories owing to their superior properties, including better corrosion resistance and thermal shock resistance (TSR); unfortunately, their insufficient water-wettability has remarkably hindered their application in castables. Aiming to enhance their water-wettability, a facile and low-cost technique for fabricating carbides coated in graphite was proposed in this work. Firstly, SiC-TiC coated graphite (SiC-TiC@C) powders were prepared via modified molten salt shielding synthesis in an air atmosphere using graphite flake, Si and Ti powders as raw materials and NaCl-KCl as the molten salt shielding medium. Water-wettability and oxidation resistance of SiC-TiC@C powders were significantly improved. Compared to the Al2O3-MgO castables with graphite flakes, the water demand of the castables with SiC-TiC@C was noticeably decreased from 6.85% to 4.89%, thereby decreasing the apparent porosity of the castables with 5% SiC-TiC@C (from 20.3% to 13%), enhancing the cold strength, hot strength and oxidation resistance of the castables. Such enhancements are ascribed to continuous and crack-free SiC-TiC coatings on graphite surfaces ensuring that the castables have outstanding properties. Full article
(This article belongs to the Special Issue Powder Metallurgy: Materials and Processing II)
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16 pages, 25127 KiB  
Article
Synthesis of Tungsten Carbides in a Copper Matrix by Spark Plasma Sintering: Microstructure Formation Mechanisms and Properties of the Consolidated Materials
by Tomila M. Vidyuk, Arina V. Ukhina, Alexander I. Gavrilov, Vladislav S. Shikalov, Alexander G. Anisimov, Oleg I. Lomovsky and Dina V. Dudina
Materials 2023, 16(15), 5385; https://doi.org/10.3390/ma16155385 - 31 Jul 2023
Cited by 1 | Viewed by 722
Abstract
In this study, the synthesis of tungsten carbides in a copper matrix by spark plasma sintering (SPS) is conducted and the microstructure formation mechanisms of the composite materials are investigated. The reaction mixtures were prepared by the high-energy mechanical milling (MM) of W, [...] Read more.
In this study, the synthesis of tungsten carbides in a copper matrix by spark plasma sintering (SPS) is conducted and the microstructure formation mechanisms of the composite materials are investigated. The reaction mixtures were prepared by the high-energy mechanical milling (MM) of W, C and Cu powders. The influence of the MM time and SPS temperature on the tungsten carbide synthesis in an inert copper matrix was analyzed. It was demonstrated that the milling duration is a critical factor for creating the direct contacts between the W and C reactants and increasing the reactive transformation degree. A WC–W2C–Cu composite was fabricated from the W–C–3Cu powder mixture milled for 10 min and subjected to SPS at a temperature of 980 °C for 5 min. The formation of unconventional microstructures with Cu-rich regions is related to inter-particle melting during SPS. The WC–W2C–Cu composite showed a promising combination of mechanical and functional properties: a hardness of 300 HV, an electrical conductivity of 24% of the International Annealed Copper Standard, a residual porosity of less than 5%, a coefficient of friction in pair with a WC-6Co counterpart of 0.46, and a specific wear rate of the material of 0.52 × 10−5 mm3 N−1 m−1. Full article
(This article belongs to the Special Issue Powder Metallurgy: Materials and Processing II)
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15 pages, 8259 KiB  
Article
Microstructural Characterization and Prior Particle Boundary (PPB) of PM Nickel-Based Superalloys by Spark Plasma Sintering (SPS)
by Zijun Qin, Qianyi Li, Guowei Wang and Feng Liu
Materials 2023, 16(13), 4664; https://doi.org/10.3390/ma16134664 - 28 Jun 2023
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Abstract
This research investigates the microstructure and defects of powder metallurgy (PM) nickel-based superalloys prepared by spark plasma sintering (SPS). The densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sintering via SPS are specifically analyzed. [...] Read more.
This research investigates the microstructure and defects of powder metallurgy (PM) nickel-based superalloys prepared by spark plasma sintering (SPS). The densification, microstructural evolution, and precipitate phase evolution processes of FGH96 superalloy after powder heat treatment (PHT) and sintering via SPS are specifically analyzed. Experimental results demonstrate that SPS technology, when applied to sinter at the sub-solidus temperature of the γ’ phase, effectively mitigates the formation of a prior particle boundary (PPB). Based on experimental and computational findings, it has been determined that the presence of elemental segregation and Al2O3 oxides on the surface of pre-alloyed powders leads to the preferential precipitation of MC-type carbides and Al2O3 and ZrO2 oxides in the sintering necks during the hot consolidation process, resulting in the formation of PPB. This study contributes to the understanding of microstructural modifications achieved through SPS technology, providing crucial information for optimizing sintering conditions and reducing the widespread occurrence of PPB, ultimately enhancing the material performance of PM nickel-based superalloys. Full article
(This article belongs to the Special Issue Powder Metallurgy: Materials and Processing II)
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