Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process

Micro-powder injection molding (μPIM) is a promising process that may satisfy the demand on miniaturization parts to micro domain in mass production with low manufacturing cost. Three mol% yttria stabilized zirconia (YSZ) with nano-sized powder and binder system consists of polyethylene glycol (PEG)...

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Main Authors:	Hafizawati Zakaria, Norhamidi Muhamad, Abu Bakar Sulong, Mohd Halim Irwan Ibrahim, Farhana Foudzi
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2014
Online Access:	http://journalarticle.ukm.my/6825/ http://journalarticle.ukm.my/6825/ http://journalarticle.ukm.my/6825/1/17_Hafizawati.pdf

id	ukm-6825
recordtype	eprints
spelling	ukm-68252016-12-14T06:42:18Z http://journalarticle.ukm.my/6825/ Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process Hafizawati Zakaria, Norhamidi Muhamad, Abu Bakar Sulong, Mohd Halim Irwan Ibrahim, Farhana Foudzi, Micro-powder injection molding (μPIM) is a promising process that may satisfy the demand on miniaturization parts to micro domain in mass production with low manufacturing cost. Three mol% yttria stabilized zirconia (YSZ) with nano-sized powder and binder system consists of polyethylene glycol (PEG), polymethyl methacrylate (PMMA) and stearic acid (SA) were used. Nano-size powders with higher surface area generally require more binder to form a feedstock. As such, determination of the optimum powder loading of the feedstock for μPIM process is important. The rheological characteristics of different YSZ feedstocks with powder loading of 52 53 and 54 vol.% were investigated in terms of flow behavior as a function of viscosity and shear rate. Fairly low values of flow behavior exponent ranging from 0.25 to 0.39 (n<1) resulted in pseudoplastic flow behavior of the examined YSZ feedstock. The 52 vol.% feedstock exhibited the lowest viscosity resulting in highest activation energy and lowest moldability index of 1.862×10-6, while the 54 vol.% feedstock regardless to its high viscosity, yielded a low activation energy of 4.14 kJ/mol and high moldability index of 4.59×10-6. Based on rheological properties obtained, a powder loading of 54 vol.% has desirable feedstock characteristics for μPIM process and exhibited molding ability for micro detail filling. The relationship between the optimum rheological properties obtained and the actual injection process was also determined. The results showed that the green parts were able to be injected without defects such as short shot or flashing. Universiti Kebangsaan Malaysia 2014-01 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/6825/1/17_Hafizawati.pdf Hafizawati Zakaria, and Norhamidi Muhamad, and Abu Bakar Sulong, and Mohd Halim Irwan Ibrahim, and Farhana Foudzi, (2014) Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process. Sains Malaysiana, 43 (1). pp. 129-136. ISSN 0126-6039 http://www.ukm.my/jsm/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	Micro-powder injection molding (μPIM) is a promising process that may satisfy the demand on miniaturization parts to micro domain in mass production with low manufacturing cost. Three mol% yttria stabilized zirconia (YSZ) with nano-sized powder and binder system consists of polyethylene glycol (PEG), polymethyl methacrylate (PMMA) and stearic acid (SA) were used. Nano-size powders with higher surface area generally require more binder to form a feedstock. As such, determination of the optimum powder loading of the feedstock for μPIM process is important. The rheological characteristics of different YSZ feedstocks with powder loading of 52 53 and 54 vol.% were investigated in terms of flow behavior as a function of viscosity and shear rate. Fairly low values of flow behavior exponent ranging from 0.25 to 0.39 (n<1) resulted in pseudoplastic flow behavior of the examined YSZ feedstock. The 52 vol.% feedstock exhibited the lowest viscosity resulting in highest activation energy and lowest moldability index of 1.862×10-6, while the 54 vol.% feedstock regardless to its high viscosity, yielded a low activation energy of 4.14 kJ/mol and high moldability index of 4.59×10-6. Based on rheological properties obtained, a powder loading of 54 vol.% has desirable feedstock characteristics for μPIM process and exhibited molding ability for micro detail filling. The relationship between the optimum rheological properties obtained and the actual injection process was also determined. The results showed that the green parts were able to be injected without defects such as short shot or flashing.
format	Article
author	Hafizawati Zakaria, Norhamidi Muhamad, Abu Bakar Sulong, Mohd Halim Irwan Ibrahim, Farhana Foudzi,
spellingShingle	Hafizawati Zakaria, Norhamidi Muhamad, Abu Bakar Sulong, Mohd Halim Irwan Ibrahim, Farhana Foudzi, Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process
author_facet	Hafizawati Zakaria, Norhamidi Muhamad, Abu Bakar Sulong, Mohd Halim Irwan Ibrahim, Farhana Foudzi,
author_sort	Hafizawati Zakaria,
title	Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process
title_short	Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process
title_full	Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process
title_fullStr	Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process
title_full_unstemmed	Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process
title_sort	moldability characteristics of 3 mol% yttria stabilized zirconia feedstock for micro-powder injection molding process
publisher	Universiti Kebangsaan Malaysia
publishDate	2014
url	http://journalarticle.ukm.my/6825/ http://journalarticle.ukm.my/6825/ http://journalarticle.ukm.my/6825/1/17_Hafizawati.pdf
first_indexed	2023-09-18T19:47:59Z
last_indexed	2023-09-18T19:47:59Z
_version_	1777406029282148352

Moldability characteristics of 3 mol% Yttria Stabilized Zirconia feedstock for micro-powder injection molding process

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