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Powder injection Moulding (PIM) & Material Extrusion Additive Manufacturing with...
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Powder injection Moulding (PIM) & Material Extrusion Additive Manufacturing with Highly-Filled Polymer (MEAM-HP)

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

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 11393

Special Issue Editor

Prof. Vincent Demers

E-Mail Website
Guest Editor
École de technologie supérieure, 1100 Notre-Dame West, Montreal, QC, H3C 1K3, Canada
Interests: powder metallurgy; powder injection moulding; rheology; material characterization; debinding; sintering

Special Issue Information

Dear Colleagues,

Development of a powder injection moulding and 3D printing processes, including mixing, injection, 3D printing extrusion, debinding, and sintering, has been a very active research field in the last few decades. By combining experimental and numerical approaches, PIM and MEAM-HP technologies have demonstrated their competitiveness in delivering high shape complexity, high properties, and suitable dimensional and geometrical tolerances compared with conventional forming routes. This Special Issue on “Metal Injection Moulding & Material Extrusion Additive Manufacturing with Highly-Filled Polymer” intends to collect the last developments in mixing, moulding, 3D printing extrusion, debinding, sintering, and post-processing stages of the PIM & MEAM-HP processes. Topics addressed in this Special Issue may include but are not limited to:

- Developments in feedstock formulations and characterization of feedstocks properties;
- Numerical simulation of mould filling;
- Feedstocks mouldability, tooling, and evaluation of moulding defects;
- Development of 3D printing using material extrusion additive manufacturing with highly-filled polymer
- Debinding;
- Sintering (including modeling, charaterisation, and process optimisation);
- Secondary processing;
- Industrial applications.

Prof. Vincent Demers
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

  • powder injection moulding
  • mixing
  • moulding
  • rheological properties
  • thermal properties
  • numerical simulation
  • moldability
  • moulding defects

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Published Papers (3 papers)

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Research

10 pages, 3871 KiB  
Article
Presintered Titanium-Hydroxyapatite Composite Fabricated via PIM Route
by Nurul Nadiah Mahmud, Abu Bakar Sulong, Bhupendra Sharma and Kei Ameyama
Metals 2021, 11(2), 318; https://doi.org/10.3390/met11020318 - 12 Feb 2021
Cited by 6 | Viewed by 2358
Abstract
Ti6Al4V-HA composites have been recognized for their potential for biomedical implantation purposes. In the present study, Ti6Al4V-HA composites were fabricated by Powder Injection Molding (PIM) route. Ti6Al4V-HA feedstock at a ratio of 87:13 vol.% was prepared by using a binder system consisting of [...] Read more.
Ti6Al4V-HA composites have been recognized for their potential for biomedical implantation purposes. In the present study, Ti6Al4V-HA composites were fabricated by Powder Injection Molding (PIM) route. Ti6Al4V-HA feedstock at a ratio of 87:13 vol.% was prepared by using a binder system consisting of palm stearin (PS) and polyethylene (PE). The Critical Powder Volume Percentage (CPVP) value for Ti6Al4V-HA was 68 vol.%. Ti6Al4V-HA feedstock was developed at 66 vol.% powder loading. Ti6Al4V-HA feedstock showed pseudoplastic behaviour with a low viscosity and low activation energy of flow and was successfully injected into a tensile bar shape. The debinding process involved a solvent and thermal debinding operation. The debonded parts were sintered at 1300 °C, and the influence of the presintering stage on the physical and mechanical properties of the sintered parts was investigated. It was proven that the presintering stage was able to restrain the transformation of Ti6Al4V into Ti3Al (α2) as well as the decomposition of HA. These are key findings ideas for the designing of sintering parameters, where the decomposition of HA becoming the main problem in the sintering of Ti6Al4V-HA composites at a high temperature. The obtained results also showed that the sintered parts had a porous structure, which looked promising for their use in biomedical implantations. purposes. Full article
(This article belongs to the Special Issue Powder injection Moulding (PIM) & Material Extrusion Additive Manufacturing with Highly-Filled Polymer (MEAM-HP))
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13 pages, 4440 KiB  
Article
Effect of Thermal Debinding Conditions on the Sintered Density of Low-Pressure Powder Injection Molded Iron Parts
by Atefeh A. Tafti, Vincent Demers, Seyed Mohammad Majdi, Guillem Vachon and Vladimir Brailovski
Metals 2021, 11(2), 264; https://doi.org/10.3390/met11020264 - 4 Feb 2021
Cited by 15 | Viewed by 4070
Abstract
Low-pressure powder injection molding (LPIM) is a cost-effective technology for producing intricate small metal parts at high, medium, and low production volumes in applications which, to date, have involved ceramics or spherical metal powders. Since the use of irregular metal powders represents a [...] Read more.
Low-pressure powder injection molding (LPIM) is a cost-effective technology for producing intricate small metal parts at high, medium, and low production volumes in applications which, to date, have involved ceramics or spherical metal powders. Since the use of irregular metal powders represents a promising way to reduce overall production costs, this study aims to investigate the potential of manufacturing powder injection molded parts from irregular commercial iron powders using the LPIM approach. To this end, a low viscosity feedstock was injected into a rectangular mold cavity, thermally wick-debound using three different pre-sintering temperatures, and finally sintered using an identical sintering cycle. During debinding, an increase in pre-sintering temperature from 600 to 850 °C decreased the number of fine particles. This decreased the sintered density from 6.2 to 5.1 g/cm3, increased the average pore size from 9 to 14 μm, and decreased pore circularity from 67 to 59%. Full article
(This article belongs to the Special Issue Powder injection Moulding (PIM) & Material Extrusion Additive Manufacturing with Highly-Filled Polymer (MEAM-HP))
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17 pages, 8956 KiB  
Article
Bi-Material Micro-Part of Stainless Steel and Zirconia by Two-Component Micro-Powder Injection Molding: Rheological Properties and Solvent Debinding Behavior
by Al Basir, Abu Bakar Sulong, Nashrah Hani Jamadon and Norhamidi Muhamad
Metals 2020, 10(5), 595; https://doi.org/10.3390/met10050595 - 2 May 2020
Cited by 10 | Viewed by 3896
Abstract
From the micro-powder injection molding (μPIM) process, a two-component micro-powder injection molding (2C-μPIM) process has evolved due to the growing demand for multi-functional micro-components in avant-garde applications. 2C-μPIM technology provides the opportunity to conjugate distinct materials within one part. Stainless steel (SS 17-4PH) [...] Read more.
From the micro-powder injection molding (μPIM) process, a two-component micro-powder injection molding (2C-μPIM) process has evolved due to the growing demand for multi-functional micro-components in avant-garde applications. 2C-μPIM technology provides the opportunity to conjugate distinct materials within one part. Stainless steel (SS 17-4PH) and 3 mol.% yttria-stabilized zirconia (3YSZ) are characteristically recognized for their corrosion resistance and high hardness. In this work, the obtained critical powder volume concentration (CPVC) of SS 17-4PH and 3YSZ powders were 71.7 and 47.1 vol.%, respectively. Solid loadings of 2 and 3 vol.% less than the CPVC were considered as the optimal content for both powders. Feedstocks were obtained by mixing SS 17-4PH and 3YSZ powders with a binder system comprised of palm stearin (PS) and low-density polyethylene (LDPE). The rheological behaviors of the prepared feedstocks were assessed to figure out the feedstocks having the best rheological properties. The feedstocks of SS 17-4PH and 3YSZ with powder loadings of 69 and 44 vol.% were eventually injected to produce bi-material micro-parts. The optimal solvent debinding temperature of the green bi-material micro-part was then investigated, and it was found that 73.3% soluble binder was removed when bi-material was immersed in acetone at 70 °C for 40 min. Full article
(This article belongs to the Special Issue Powder injection Moulding (PIM) & Material Extrusion Additive Manufacturing with Highly-Filled Polymer (MEAM-HP))
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