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Metals
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Metal Injection Molding of Functional Alloys
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Metal Injection Molding of Functional Alloys

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Powder Metallurgy".

Deadline for manuscript submissions: closed (28 February 2022) | Viewed by 2433

Special Issue Editor

Prof. Dr. Efraín Carreño-Morelli

E-Mail Website
Guest Editor
HES-SO University of Applied Sciences and Arts Western Switzerland, CH-1950 Sion, Switzerland
Interests: powder metallurgy; MIM. CIM; additive manufacturing; selective laser melting; binder jetting 3DP of light metals; metal-ceramic composites; cemented carbides

Special Issue Information

Dear Colleagues,

"Metal injection moulding (MIM) is a well-established production technique, which combines the advantages of plastic injection moulding (high shaping capability, mass production, reduced part price) and the advantages of metals compared with polymers (higher strength and stiffness, electrical, thermal and magnetic properties).

MIM has proven to be a cost-effective solution to produce parts of complex geometry from both structural and functional alloys. For structural alloy parts, good mechanical properties are the main requirement. For functional alloy parts, the other properties are the most relevant for the target applications.

This Special Issue focuses on recent advances in MIM of magnetic materials, porous parts, gradient materials, catalytic materials, shape memory and superelastic alloys, low expansion alloys, lightweight or heavy alloys, corrosion resistant materials, biocompatible materials, temperature resistant materials, materials for actuators, and any application in which the functional character is the priority over high strength or stiffness. Powder and feedstock production, mould design, part processing and finishing, materials characterization and modelling are covered. The applications fields include automotive, aerospace, dental and medical, electronics, and energy sectors among others."

Prof. Efraín Carreño-Morelli
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 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

  • Metal injection moulding
  • Powder Metallurgy
  • Powder and Feedstock Processing
  • Functional Materials
  • Part and Mould Design
  • Modelling

Published Papers (1 paper)

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Research

19 pages, 14177 KiB  
Article
Enhancing Properties of Soft Magnetic Materials: A Study into Hot Isostatic Pressing and Sintering Atmosphere Influences
by Ana Romero, Angel L. Morales and Gemma Herranz
Metals 2021, 11(4), 643; https://doi.org/10.3390/met11040643 - 15 Apr 2021
Cited by 4 | Viewed by 1935
Abstract
Soft magnetic materials are characterized by achieving a high magnetic induction value in the presence of a small magnetic field. Common applications of these materials, such as transformers or sensors, are in constant evolution and new requirements are becoming more demanding. Nickel and [...] Read more.
Soft magnetic materials are characterized by achieving a high magnetic induction value in the presence of a small magnetic field. Common applications of these materials, such as transformers or sensors, are in constant evolution and new requirements are becoming more demanding. Nickel and its alloys are employed as smart materials taking advantage of their superior magnetoelastic properties. A metal injection molding (MIM) technique provides high-quality complex-shaped parts with a good density and controlled impurity levels, which are necessary for these applications, by carefully adjusting the sintering stage. Previous investigations have established a sintering cycle for pure nickel consisting of 1325 ∘C for 12 h within an N2-5%H2 atmosphere. Nevertheless, microstructural, mechanical and magnetoelastic responses can still be greatly enhanced. In this context, the effects of hot isostatic pressing (HIP), and sintering atmosphere have been investigated. The application of an adequate HIP treatment leads to significant improvements in comparison to the reference sintering process. It achieves almost complete densification while increasing field-dependent elastic modulus from 8.1% up to 9.6%. Additionally, the sintering atmosphere has been proven to be a key factor in reducing impurities and hence facilitating magnetic domain motion. Three different atmospheres have been studied: N2-5%H2 (with a higher gas flow), N2-10%H2-0.1%CH4 and low vacuum. Minimum carbon contents have been registered using more reducing atmospheres (N2-5%H2 and N2-10%H2-0.1%CH4) which has led to values of field-dependent elastic modulus higher than 10%. This value is 2.5 times higher than that obtained when nickel parts are processed via conventional techniques. Moreover, although minimizing carbon content has been shown to be easier and more beneficial than achieving complete densification, both strategies could be used in combination to improve and maximize magnetoelastic performance. Full article
(This article belongs to the Special Issue Metal Injection Molding of Functional Alloys)
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