Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
5.2
3.4
Journals
Materials
Special Issues
Preparation and Applications of Metal and Alloy Powders
materials-logo
Submit to Special Issue Submit Abstract to Special Issue Review for Materials Propose a Special Issue

Journal Menu

► Journal Menu

Journal Browser

► Journal Browser
share announcement

Preparation and Applications of Metal and Alloy Powders

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

Deadline for manuscript submissions: 10 May 2024 | Viewed by 4854

Special Issue Editors

Prof. Dr. Manuel Vieira

E-Mail Website
Guest Editor
Metallurgical and Materials Engineering Department, Faculty of Engineering, Oporto University, 4099-002 Porto, Portugal
Interests: advanced manufacturing processes; mechanical and microstructural characterization of metallic materials, nanocomposites
Special Issues, Collections and Topics in MDPI journals
Dr. Ana Rosanete Lourenço Reis

E-Mail Website
Guest Editor
Department of Mechanical Engineering, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Interests: advanced manufacturing techniques; materials characterization; numerical modeling; processing controls
Dr. Omid Emadinia

E-Mail Website
Guest Editor
Advanced Manufacturing Technology Unit, Institute of Science and Innovation in Mechanical and Industrial Engineering (INEGI), 4200-465 Porto, Portugal
Interests: materials characterization; powder metallurgy; metal matrix composites; additive manufacturing; sustainability; joining

Special Issue Information

Dear Colleagues,

Casting, forging, and machining are conventional manufacturing techniques to produce metallic components. However, energy consumption, geometry, series production, and residues are some critical issues. Powder metallurgy routes seem interesting to produce small parts and semi-complex geometries, leaving fewer residues. Recent techniques such as additive manufacturing provided some advantages including the production of complex geometries and a few numbered products. Thus, the use of metallic powders has become more highlighted than before. However, proper preparations and adequate processing conditions will lead to noteworthy applications in mold, transport, and medical industries. Powder processing can involve single-composition virgin powders, (nano)composite production, mechanical alloying or using rather recent developments such as high entropy alloys or functional materials. Post-processing and/or numerical simulations are complementary steps in order to foster the process and production. The importance of resources and sustainability issues have also led to paying attention to recycling, adding value to residues and creating closed production cycles in the field of powder processing and applications.

Powder preparations can involve different mixing techniques and recycling for additive manufacturing processes. The success of powder applications depends not only on the powder characteristics (shape, size, size distribution, structure, density, and flowability) but also on the optimization of densification or consolidation achieved through sintering or melting approaches. Microstructural characterizations, mechanical and wear analyses, etc. are essential aspects of research and development. Nevertheless, conventional compaction-sintering, powder injection molding, or even advanced techniques such as field-assisted sintering, cold/thermal spraying, cladding, selective laser sintering, filament extrusion printing, powder binder jetting, laser or electron beam melting or binder melting methodologies are welcome for this Special Issue as well, both from academic and industrial researchers. 

Prof. Dr. Manuel Vieira
Dr. Ana Rosanete Lourenço Reis
Dr. Omid Emadinia
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 characteristics
  • mixing and feedstock
  • sintering
  • melting
  • additive manufacturing
  • advanced materials
  • microstructural and mechanical characterizations
  • properties
  • numerical modeling

Published Papers (4 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

Jump to: Review

13 pages, 12060 KiB  
Article
Study on the Fluorination Process of Sc2O3 by NH4HF2
by Zhi Li, Chengwei Zhan, Huan Yu, Xitao Wang, Shouqiu Tang, Jixue Zhou and Jianhua Wu
Materials 2023, 16(17), 5984; https://doi.org/10.3390/ma16175984 - 31 Aug 2023
Viewed by 751
Abstract
Research on rare-earth fluorides is of urgent and critical importance for the preparation and emerging applications of high-purity alloys. The fluorination of Sc2O3 by NH4HF2 to fabricate ScF3 is investigated. The effects of the fluorination temperature, [...] Read more.
Research on rare-earth fluorides is of urgent and critical importance for the preparation and emerging applications of high-purity alloys. The fluorination of Sc2O3 by NH4HF2 to fabricate ScF3 is investigated. The effects of the fluorination temperature, time and mass ratio of reactant on the fluorination rate and fluoride are discussed in this work. The fluorination reaction was first confirmed using thermodynamic calculation. The thermal and mass stability of the fluorination process were analyzed by thermogravimetric and differential scanning calorimetric (TG-DSC). The as-obtained products at different fluorination temperatures were characterized by Powder X-ray diffraction (PXRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results indicated that the fluorination began at room temperature (RT) with the formation of (NH4)3ScF6. With the increase of temperature, the reaction proceeded sequentially through the formation of NH4ScF4, (NH4)2Sc3F11, and finally ScF3. The fluorination rate increased with the increase of fluorination temperature and holding time. ScF3 with a purity of 99.997 wt.% could be obtained by fluorination at 400 °C for 2 h. Full article
(This article belongs to the Special Issue Preparation and Applications of Metal and Alloy Powders)
►▼ Show Figures

Figure 1

14 pages, 3964 KiB  
Article
Effect of Mo Oxides on the Phase Composition and Characteristics of Mo-10Re Pre-Alloyed Powders Co-Reduced with NH4ReO4
by Yi Zeng, Chaoping Liang, Yuanjun Sun, Na Wang, Xiangdong Ding and Jun Sun
Materials 2023, 16(17), 5936; https://doi.org/10.3390/ma16175936 - 30 Aug 2023
Viewed by 550
Abstract
Mo-Re pre-alloyed powders are crucial raw materials in fabricating Mo-Re alloys, and their properties can significantly impact the properties of the resulting alloys. The powders are usually produced by the co-reduction of a mixture of Mo and Re oxides. However, it remains unclear [...] Read more.
Mo-Re pre-alloyed powders are crucial raw materials in fabricating Mo-Re alloys, and their properties can significantly impact the properties of the resulting alloys. The powders are usually produced by the co-reduction of a mixture of Mo and Re oxides. However, it remains unclear if the overall characteristics of the produced Mo-Re powders rely on the different combinations of the Mo and Re oxide precursors. Therefore, in this work, a comparative study is conducted on the co-reduction processes of different Mo oxides together with NH4ReO4, along with its influence on the size distribution and phase composition of the resulting Mo-10Re pre-alloyed powders. The results show that MoO3 is more promising than MoO2 as a precursor material. The powders fabricated using MoO3, when compared to MoO2, have a much more uniform size distribution, with a primary particle size ranging from 0.5–4 μm. In addition, it is also beneficial to achieve atomic-scale homogeneous mixing with Mo and Re elements and the formation of a solely Mo(Re) solid solution if MoO3 is used as a precursor oxide. In contrast, such desirable features were not identified when using the MoO2 route. The reason for this discrepancy may relate to whether Mo-O-Re metallurgical bonding has formed during the co-reduction process. Full article
(This article belongs to the Special Issue Preparation and Applications of Metal and Alloy Powders)
►▼ Show Figures

Figure 1

Review

Jump to: Research

28 pages, 7950 KiB  
Review
A Review of the Metal Additive Manufacturing Processes
by Mohaddeseh Tebianian, Sara Aghaie, Nazanin Sadat Razavi Jafari, Seyed Reza Elmi Hosseini, António B. Pereira, Fábio A. O. Fernandes, Mojtaba Farbakhti, Chao Chen and Yuanming Huo
Materials 2023, 16(24), 7514; https://doi.org/10.3390/ma16247514 - 05 Dec 2023
Cited by 2 | Viewed by 1756
Abstract
Metal additive manufacturing (AM) is a layer-by-layer process that makes the direct manufacturing of various industrial parts possible. This method facilitates the design and fabrication of complex industrial, advanced, and fine parts that are used in different industry sectors, such as aerospace, medicine, [...] Read more.
Metal additive manufacturing (AM) is a layer-by-layer process that makes the direct manufacturing of various industrial parts possible. This method facilitates the design and fabrication of complex industrial, advanced, and fine parts that are used in different industry sectors, such as aerospace, medicine, turbines, and jewelry, where the utilization of other fabrication techniques is difficult or impossible. This method is advantageous in terms of dimensional accuracy and fabrication speed. However, the parts fabricated by this method may suffer from faults such as anisotropy, micro-porosity, and defective joints. Metals like titanium, aluminum, stainless steels, superalloys, etc., have been used—in the form of powder or wire—as feed materials in the additive manufacturing of various parts. The main criterion that distinguishes different additive manufacturing processes from each other is the deposition method. With regard to this criterion, AM processes can be divided into four classes: local melting, sintering, sheet forming, and electrochemical methods. Parameters affecting the properties of the additive-manufactured part and the defects associated with an AM process determine the method by which a certain part should be manufactured. This study is a survey of different additive manufacturing processes, their mechanisms, capabilities, shortcomings, and the general properties of the parts manufactured by them. Full article
(This article belongs to the Special Issue Preparation and Applications of Metal and Alloy Powders)
►▼ Show Figures

Figure 1

20 pages, 2431 KiB  
Review
Fused Filament Fabrication for Metallic Materials: A Brief Review
by Jose M. Costa, Elsa W. Sequeiros and Manuel F. Vieira
Materials 2023, 16(24), 7505; https://doi.org/10.3390/ma16247505 - 05 Dec 2023
Cited by 1 | Viewed by 1427
Abstract
Fused filament fabrication (FFF) is an extrusion-based additive manufacturing (AM) technology mostly used to produce thermoplastic parts. However, producing metallic or ceramic parts by FFF is also a sintered-based AM process. FFF for metallic parts can be divided into five steps: (1) raw [...] Read more.
Fused filament fabrication (FFF) is an extrusion-based additive manufacturing (AM) technology mostly used to produce thermoplastic parts. However, producing metallic or ceramic parts by FFF is also a sintered-based AM process. FFF for metallic parts can be divided into five steps: (1) raw material selection and feedstock mixture (including palletization), (2) filament production (extrusion), (3) production of AM components using the filament extrusion process, (4) debinding, and (5) sintering. These steps are interrelated, where the parameters interact with the others and have a key role in the integrity and quality of the final metallic parts. FFF can produce high-accuracy and complex metallic parts, potentially revolutionizing the manufacturing industry and taking AM components to a new level. In the FFF technology for metallic materials, material compatibility, production quality, and cost-effectiveness are the challenges to overcome to make it more competitive compared to other AM technologies, like the laser processes. This review provides a comprehensive overview of the recent developments in FFF for metallic materials, including the metals and binders used, the challenges faced, potential applications, and the impact of FFF on the manufacturing (prototyping and end parts), design freedom, customization, sustainability, supply chain, among others. Full article
(This article belongs to the Special Issue Preparation and Applications of Metal and Alloy Powders)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-4
Back to TopTop