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Moldability characteristics of 3 mol% yttria stabilized zirconia feedstock for micro-powder injection molding process

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Main Authors: Hafizawati, Zakaria, Norhamidi, Muhamad, Abu Bakar, Sulong, Farhana, Foudzi
Other Authors: hafizawati@unimap.edu.my
Format: Article
Language:English
Published: Universiti Kebangsaan Malaysia 2014
Subjects:
Feedstock
Micro-powder injection molding
Rheological properties
Online Access:http://dspace.unimap.edu.my:80/dspace/handle/123456789/34712
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spelling my.unimap-347122014-05-25T06:56:18Z Moldability characteristics of 3 mol% yttria stabilized zirconia feedstock for micro-powder injection molding process Hafizawati, Zakaria Norhamidi, Muhamad Abu Bakar, Sulong Farhana, Foudzi hafizawati@unimap.edu.my Feedstock Micro-powder injection molding Rheological properties Link to publisher's homepage at http://www.ukm.my/jsm/ 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 2014-05-25T06:56:18Z 2014-05-25T06:56:18Z 2014 Article Sains Malaysiana, vol.43(1), 2014, pages 129–136 01236-6039 http://dspace.unimap.edu.my:80/dspace/handle/123456789/34712 http://www.ukm.my/jsm/pdf_files/SM-PDF-43-1-2014/17%20Hafizawati.pdf en Universiti Kebangsaan Malaysia
institution Universiti Malaysia Perlis
building UniMAP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Perlis
content_source UniMAP Library Digital Repository
url_provider http://dspace.unimap.edu.my/
language English
topic Feedstock
Micro-powder injection molding
Rheological properties
spellingShingle Feedstock
Micro-powder injection molding
Rheological properties
Hafizawati, Zakaria
Norhamidi, Muhamad
Abu Bakar, Sulong
Farhana, Foudzi
Moldability characteristics of 3 mol% yttria stabilized zirconia feedstock for micro-powder injection molding process
description Link to publisher's homepage at http://www.ukm.my/jsm/
author2 hafizawati@unimap.edu.my
author_facet hafizawati@unimap.edu.my
Hafizawati, Zakaria
Norhamidi, Muhamad
Abu Bakar, Sulong
Farhana, Foudzi
format Article
author Hafizawati, Zakaria
Norhamidi, Muhamad
Abu Bakar, Sulong
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://dspace.unimap.edu.my:80/dspace/handle/123456789/34712
_version_ 1643797538296299520
score 13.222552

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