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Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy

Hypereutectic Al–Si (20 wt.%) alloy parts were fabricated by employing a powder injection moulding (PIM) technique with a developed multi-component binder system composed of high-density polyethylene (35 wt.%), carnauba wax (62 wt.%) and stearic acid (3 wt.%). The feedstocks contained 83 wt.% metal...

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Autores principales: Ni, Jiaqi, Yu, Muhuo, Han, Keqing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978184/
https://www.ncbi.nlm.nih.gov/pubmed/29772669
http://dx.doi.org/10.3390/ma11050807
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author Ni, Jiaqi
Yu, Muhuo
Han, Keqing
author_facet Ni, Jiaqi
Yu, Muhuo
Han, Keqing
author_sort Ni, Jiaqi
collection PubMed
description Hypereutectic Al–Si (20 wt.%) alloy parts were fabricated by employing a powder injection moulding (PIM) technique with a developed multi-component binder system composed of high-density polyethylene (35 wt.%), carnauba wax (62 wt.%) and stearic acid (3 wt.%). The feedstocks contained 83 wt.% metal powders. The debinding process was carried out by a combination of solvent extraction and thermal decomposition. The effects of solvent debinding variables such as kind of solvents, debinding temperatures and time, and the bulk surface area to volume ratios on the debinding process were investigated. Thermal debinding and the subsequent sintering process were carried out in a heating sequence under a nitrogen atmosphere. The influences of sintering temperature and sintering time on the mechanical properties and structure were considered. Under the optimal sintering condition, sintering at 550 °C for 3 h, the final sintering parts were free of distortion and exhibited good mechanical properties. Relative sintered density, Brinell hardness, and tensile strength were ~95.5%, 58 HBW and ~154, respectively.
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spelling pubmed-59781842018-05-31 Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy Ni, Jiaqi Yu, Muhuo Han, Keqing Materials (Basel) Article Hypereutectic Al–Si (20 wt.%) alloy parts were fabricated by employing a powder injection moulding (PIM) technique with a developed multi-component binder system composed of high-density polyethylene (35 wt.%), carnauba wax (62 wt.%) and stearic acid (3 wt.%). The feedstocks contained 83 wt.% metal powders. The debinding process was carried out by a combination of solvent extraction and thermal decomposition. The effects of solvent debinding variables such as kind of solvents, debinding temperatures and time, and the bulk surface area to volume ratios on the debinding process were investigated. Thermal debinding and the subsequent sintering process were carried out in a heating sequence under a nitrogen atmosphere. The influences of sintering temperature and sintering time on the mechanical properties and structure were considered. Under the optimal sintering condition, sintering at 550 °C for 3 h, the final sintering parts were free of distortion and exhibited good mechanical properties. Relative sintered density, Brinell hardness, and tensile strength were ~95.5%, 58 HBW and ~154, respectively. MDPI 2018-05-16 /pmc/articles/PMC5978184/ /pubmed/29772669 http://dx.doi.org/10.3390/ma11050807 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ni, Jiaqi
Yu, Muhuo
Han, Keqing
Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy
title Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy
title_full Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy
title_fullStr Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy
title_full_unstemmed Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy
title_short Debinding and Sintering of an Injection-Moulded Hypereutectic Al–Si Alloy
title_sort debinding and sintering of an injection-moulded hypereutectic al–si alloy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978184/
https://www.ncbi.nlm.nih.gov/pubmed/29772669
http://dx.doi.org/10.3390/ma11050807
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