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Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process

Micropowder injection moulding (μPIM) is an ideal alternative for miniaturization of parts because of its ability to produce complex micro-geometries at low manufacturing cost. Utilizing bimodal powder mixtures in feedstock can increase packing density and densification of parts fabricated via μPIM....

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Main Authors: Rajabi, Javad, Fayyaz, Abdolali
Format: Article
Language:English
Published: Penerbit Universiti Kebangsaan Malaysia 2019
Online Access:http://journalarticle.ukm.my/14816/1/07.pdf
http://journalarticle.ukm.my/14816/
http://www.ukm.my/jkukm/volume-312-2019/
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spelling my-ukm.journal.148162020-07-10T02:11:03Z http://journalarticle.ukm.my/14816/ Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process Rajabi, Javad Fayyaz, Abdolali Micropowder injection moulding (μPIM) is an ideal alternative for miniaturization of parts because of its ability to produce complex micro-geometries at low manufacturing cost. Utilizing bimodal powder mixtures in feedstock can increase packing density and densification of parts fabricated via μPIM. This study investigated the feedstock consists of nano-micro 316L stainless steel powder-and polyethylene glycol-based binder system. The flowability of different feedstocks was evaluated using rheological parameters, including critical powder volume concentration (CPVC), melt viscosity, activation energy, and rheological index. Results showed that mixing nanopowders with micropowders increases CPVC from 67.66 vol.% (pure micropowder) to 78.33 vol.%. The nano-micropowder feedstock showed viscosity below 45 Pa·s and shear rate in the range of 102 s−1 to 105 s−1, which are suitable for the μPIM process. The determined flow index values ranged from 0.25 to 0.76, and the reduced n values at high temperature with the addition of nanopowder indicated a possible increase in shear-thinning behavior. A defect-free microsample was obtained at an injection temperature of 85°C with sintering at 1200°C. Using the nano–micro bimodal powders, the hardness of the obtained samples also increased from 182 HV to 221 HV, with strength of 501 MPa, which is higher than that of the sample obtained with the use of micropowder only (435 MPa). Penerbit Universiti Kebangsaan Malaysia 2019-10 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/14816/1/07.pdf Rajabi, Javad and Fayyaz, Abdolali (2019) Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process. Jurnal Kejuruteraan, 31 (2). pp. 229-241. ISSN 0128-0198 http://www.ukm.my/jkukm/volume-312-2019/
institution Universiti Kebangsaan Malaysia
building Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description Micropowder injection moulding (μPIM) is an ideal alternative for miniaturization of parts because of its ability to produce complex micro-geometries at low manufacturing cost. Utilizing bimodal powder mixtures in feedstock can increase packing density and densification of parts fabricated via μPIM. This study investigated the feedstock consists of nano-micro 316L stainless steel powder-and polyethylene glycol-based binder system. The flowability of different feedstocks was evaluated using rheological parameters, including critical powder volume concentration (CPVC), melt viscosity, activation energy, and rheological index. Results showed that mixing nanopowders with micropowders increases CPVC from 67.66 vol.% (pure micropowder) to 78.33 vol.%. The nano-micropowder feedstock showed viscosity below 45 Pa·s and shear rate in the range of 102 s−1 to 105 s−1, which are suitable for the μPIM process. The determined flow index values ranged from 0.25 to 0.76, and the reduced n values at high temperature with the addition of nanopowder indicated a possible increase in shear-thinning behavior. A defect-free microsample was obtained at an injection temperature of 85°C with sintering at 1200°C. Using the nano–micro bimodal powders, the hardness of the obtained samples also increased from 182 HV to 221 HV, with strength of 501 MPa, which is higher than that of the sample obtained with the use of micropowder only (435 MPa).
format Article
author Rajabi, Javad
Fayyaz, Abdolali
spellingShingle Rajabi, Javad
Fayyaz, Abdolali
Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
author_facet Rajabi, Javad
Fayyaz, Abdolali
author_sort Rajabi, Javad
title Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
title_short Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
title_full Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
title_fullStr Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
title_full_unstemmed Effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
title_sort effects of nanopowder addition on rheological properties of feedstock for micropowder injection moulding process
publisher Penerbit Universiti Kebangsaan Malaysia
publishDate 2019
url http://journalarticle.ukm.my/14816/1/07.pdf
http://journalarticle.ukm.my/14816/
http://www.ukm.my/jkukm/volume-312-2019/
_version_ 1672611740827779072
score 13.211869

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