Special Issue "Powder Synthesis and Processing"

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

Deadline for manuscript submissions: 31 January 2018

Special Issue Editor

Guest Editor
Prof. Dr. Claude Estournès

Université de Toulouse, CIRIMAT, UMR CNRS-INPT-UPS, Université Toulouse III Paul-Sabatier, 118 Route de Narbonne, F-31062 Toulouse Cedex 9, France
Website | E-Mail
Interests: synthesis of ceramics (oxides and non-oxides), composites powders; elaboration of materials (ceramics, alloys, polymers, composites, etc.); development of novel, specific and multi-functional architectures (multilayered system, FGM, micro- and meso-porous composite structure, sandwiches, etc.); densification mechanisms; finite element modeling of the densification process

Special Issue Information

Dear Colleagues,

In powder metallurgy, synthesis and processing are two of the most important steps. Recent progress in the development of tailored powders to control the microstructure and properties of the final products for specific applications have been performed. Progress in mature technologies and advances in new technologies for the processing are depending on fine understanding of the chemical, physical and mechanical mechanisms driving the powder route. Modeling, both analytical and numerical, of these mechanisms and of their coupling is an essential step for the development of new materials with complex shapes and/or tailored properties.

Prof. Dr. Claude Estournès
Guest Editor

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 papers will be 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 1000 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 synthesis

-    Tailored powders with innovative methods via chemical engineering (solution precipitation, fluid phase) to mechanical methods (high energy milling, mechanical alloying)

-    Reactor engineering for innovative powders

-    Surface functionalization and core-shell particle

-    Modeling of powder synthesis

Powder processing

-    Powder forging

-    Metal injection molding

-    Field assisted sintering (SPS, microwave, flash sintering, dynamic compaction, etc.)

-    Additive manufacturing

-    Reactive sintering

-    Near-net complex shape processes (hot-pressing, powder injection molding, sinter-forging, ECAS, etc.)

-    Controlled microstructure and microstructure development (ultra-fine grains, functionally graded materials, porous materials, etc.)

-    Self-assembly and tailored nanostructures

-    Powder processing modeling

Published Papers (5 papers)

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Research

Open AccessArticle The Effect of Rolling Temperature on the Microstructure and Mechanical Properties of Surface-Densified Powder Metallurgy Fe-Based Gears Prepared by the Surface Rolling Process
Metals 2017, 7(10), 420; doi:10.3390/met7100420
Received: 7 August 2017 / Revised: 14 September 2017 / Accepted: 25 September 2017 / Published: 10 October 2017
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Abstract
In this investigation, the surface-rolling process was performed to improve the performance of PM (powder metallurgy) parts. Different rolling temperatures were applied and the effect of rolling temperature on the microstructure and mechanical properties of the surface dense layers in the samples were
[...] Read more.
In this investigation, the surface-rolling process was performed to improve the performance of PM (powder metallurgy) parts. Different rolling temperatures were applied and the effect of rolling temperature on the microstructure and mechanical properties of the surface dense layers in the samples were investigated. In the study, room temperature and temperatures of 100 °C, 200 °C, 300 °C were studied during the rolling process. The results confirmed that the sample prepared with a pre-heated temperature of 200 °C had the lowest porosity at the surface area. It also exhibited the highest surface hardness and wear resistance. The optimum rolling temperature was determined to be 200 °C and the related mechanism was discussed. Full article
(This article belongs to the Special Issue Powder Synthesis and Processing)
Figures

Open AccessArticle Tensile Properties and Fracture Behavior of a Powder-Thixoformed 2024Al/SiCp Composite at Elevated Temperatures
Metals 2017, 7(10), 408; doi:10.3390/met7100408
Received: 23 August 2017 / Revised: 7 September 2017 / Accepted: 28 September 2017 / Published: 1 October 2017
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Abstract
In the present work, the tensile properties and fracture behavior of a 2024Al composite reinforced with 10 vol % SiCp and fabricated via powder thixoforming (PT) were studied at temperatures ranging from 25 °C to 300 °C with a strain rate of
[...] Read more.
In the present work, the tensile properties and fracture behavior of a 2024Al composite reinforced with 10 vol % SiCp and fabricated via powder thixoforming (PT) were studied at temperatures ranging from 25 °C to 300 °C with a strain rate of 0.05 s−1, as well as the PT 2024 alloy. The results indicated that the tensile strengths of both the PT materials were all decreased with increasing the temperature, but the decrease rate of the composite was smaller than that of the 2024 alloy, and the composite exhibited higher tensile strength than that of the 2024 alloy at all of the employed testing temperatures due to the strengthening role of SiCp. Increasing temperature was beneficial for enhancing the ductility of materials, and the maximum elongation was reached at 250 °C. The elongation decrease over 250 °C was attributed to the cavity formation due to the debonding of the SiCp/Al interface and the fracturing of the matrix between SiCp. The fracture of the composite at room temperature initiated from the fracture of SiCp and the debonding of the SiCp/Al interface, but that at high temperatures was dominated by void nucleation and growth in the matrix besides the interface debonding. Full article
(This article belongs to the Special Issue Powder Synthesis and Processing)
Figures

Figure 1

Open AccessArticle Structure and Formation Model of Ag/TiO2 and Au/TiO2 Nanoparticles Synthesized through Ultrasonic Spray Pyrolysis
Metals 2017, 7(10), 389; doi:10.3390/met7100389
Received: 31 July 2017 / Revised: 31 August 2017 / Accepted: 18 September 2017 / Published: 25 September 2017
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Abstract
This article explains the mechanism of the metal/oxide core-shell Ag/TiO2 and Au/TiO2 nanoparticle formation via one-step ultrasonic spray pyrolysis (USP) by establishing a new model. The general knowledge on the standard “droplet-to-particle” (DTP) mechanism, nucleation, and growth processes of noble metals,
[...] Read more.
This article explains the mechanism of the metal/oxide core-shell Ag/TiO2 and Au/TiO2 nanoparticle formation via one-step ultrasonic spray pyrolysis (USP) by establishing a new model. The general knowledge on the standard “droplet-to-particle” (DTP) mechanism, nucleation, and growth processes of noble metals, as well as physical and chemical properties of core and shell materials and experimental knowledge, were utilized with the purpose of the construction of this new model. This hypothesis was assessed on silver (Ag)/titanium oxide (TiO2) and gold (Au) TiO2 binary complex nanoparticles’ experimental findings revealed by scanning electron microscopy (SEM), focused ion beam (FIB), high-resolution transmission electron microscopy (HRTEM), and simulation of crystal lattices. It was seen that two mechanisms run as proposed in the new model. However, there were some variations in size, morphology, and distribution of Ag and Au through the TiO2 core particle and these variations could be explained by the inherent physical and chemical property differences of Ag and Au. Full article
(This article belongs to the Special Issue Powder Synthesis and Processing)
Figures

Figure 1

Open AccessFeature PaperArticle The Fabrication of All-Solid-State Lithium-Ion Batteries via Spark Plasma Sintering
Metals 2017, 7(9), 372; doi:10.3390/met7090372
Received: 23 July 2017 / Revised: 31 August 2017 / Accepted: 11 September 2017 / Published: 14 September 2017
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Abstract
Spark plasma sintering (SPS) has been successfully used to produce all-solid-state lithium-ion batteries (ASSLibs). Both regular and functionally graded electrodes are implemented into novel three-layer and five-layer battery designs together with solid-state composite electrolyte. The electrical capacities and the conductivities of the SPS-processed
[...] Read more.
Spark plasma sintering (SPS) has been successfully used to produce all-solid-state lithium-ion batteries (ASSLibs). Both regular and functionally graded electrodes are implemented into novel three-layer and five-layer battery designs together with solid-state composite electrolyte. The electrical capacities and the conductivities of the SPS-processed ASSLibs are evaluated using the galvanostatic charge-discharge test. Experimental results have shown that, compared to the three-layer battery, the five-layer battery is able to improve energy and power densities. Scanning electron microscopy (SEM) is employed to examine the microstructures of the batteries especially at the electrode–electrolyte interfaces. It reveals that the functionally graded structure can eliminate the delamination effect at the electrode–electrolyte interface and, therefore, retains better performance. Full article
(This article belongs to the Special Issue Powder Synthesis and Processing)
Figures

Figure 1

Open AccessArticle Influence of Powder Surface Contamination in the Ni-Based Superalloy Alloy718 Fabricated by Selective Laser Melting and Hot Isostatic Pressing
Metals 2017, 7(9), 367; doi:10.3390/met7090367
Received: 9 May 2017 / Revised: 5 September 2017 / Accepted: 7 September 2017 / Published: 13 September 2017
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Abstract
The aim of this study was to gain a deep understanding of the microstructure-mechanical relationship between solid-state sintering and full-melting processes. The IN718 superalloy was fabricated by hot isostatic pressing (HIP) and selective laser melting (SLM). Continuous precipitates were clearly localized along the
[...] Read more.
The aim of this study was to gain a deep understanding of the microstructure-mechanical relationship between solid-state sintering and full-melting processes. The IN718 superalloy was fabricated by hot isostatic pressing (HIP) and selective laser melting (SLM). Continuous precipitates were clearly localized along the prior particle boundary (PPB) in the HIP materials, while SLM materials showed a microstructure free of PPB. The mechanical properties of specimens that underwent SLM + solution treatment and aging were comparable to those of conventional wrought specimens both at room temperature and 650 °C. However, a drop was observed in the ductility of HIP material at 650 °C. The brittle particles along the PPB were found to affect the HIP materials’ creep life and ductility during solid-state sintering. Full article
(This article belongs to the Special Issue Powder Synthesis and Processing)
Figures

Figure 1a

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