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Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)

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Main Authors: Farhana, Mohd Foudzi, Norharmidi, Muhamad, Abu Bakar, Sulong, Hafizawati, Zakaria
Format: Article
Language:English
Published: Trans Tech Publications 2011
Subjects:
Dilatant
Flow behavior
Rheology
Online Access:http://dspace.unimap.edu.my/xmlui/handle/123456789/11510
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spelling my.unimap-115102011-04-05T03:54:33Z Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM) Farhana, Mohd Foudzi Norharmidi, Muhamad Abu Bakar, Sulong Hafizawati, Zakaria Dilatant Flow behavior Rheology Link to publisher's homepage at http://www.scientific.net Micro metal injection molding (μMIM) prior to conventional plastic injection molding (PIM) has become widely demanding due to its smaller size, more complex geometric surface and time consuming on its product. Metal and ceramic in powder form of various sizes up to μm is mixed with binder system to produce products that meet the requirements. Nano size yttria stabilized zirconia (YSZ) with average particle size of 25nm, was tested both physically and mechanically for its properties before mixing and injection process using several testing such as Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), pycnometer density, critical powder volume percentage (CPVP) and rheology respectively. Grain shape for YSZ particle is near spherical with the diameter range between 21.2 - 33.5nm while the CPVP shows the highest powder loading was 41.4%. Binder system of 70% palm stearin and 30% polypropylene (PP) was then mixed with YSZ at 37%, 38% and 39% by using internal mixer with roller blade type. By using CPVP of 41.4% as the guideline, mixing was done beyond the critical point until it is capable of becoming the dough mixture and was found that 43% powder loading is the highest loading it can achieved. This dough form of every mixture of powder loading was crushed to obtain pellet size as the feedstock. Rheology test was carried out for each powder loading at 180°C, 190°C and 200°C with the load increasing from 10N to 20N to determine the plastic behavior and best relationship between viscosity (Pa.s) and shear rate (1/s). Dilatant flow behavior for all the powder loadings and smooth data distribution during testing at 180°C was observed respectively. Critical parameters involving in injection process such as mold temperature (°C), melt temperature (°C), pressure (bar) and time (s) was manipulated for every powder loading to obtain the best result with no defects such as shot and flashing. Each critical parameter increased gradually as the powder loading (%) increased. Debinding and sintering process will be carried out to determine the strength and toughness by using micro hardness and micro tensile test respectively. 2011-04-05T03:54:33Z 2011-04-05T03:54:33Z 2011 Article Applied Mechanics and Materials, vol. 44-47, 2011, pages 480-484 978-3-0378-5004-6 1660-9336 http://www.scientific.net/AMM.44-47.480 http://hdl.handle.net/123456789/11510 en Trans Tech Publications
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 Dilatant
Flow behavior
Rheology
spellingShingle Dilatant
Flow behavior
Rheology
Farhana, Mohd Foudzi
Norharmidi, Muhamad
Abu Bakar, Sulong
Hafizawati, Zakaria
Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)
description Link to publisher's homepage at http://www.scientific.net
format Article
author Farhana, Mohd Foudzi
Norharmidi, Muhamad
Abu Bakar, Sulong
Hafizawati, Zakaria
author_facet Farhana, Mohd Foudzi
Norharmidi, Muhamad
Abu Bakar, Sulong
Hafizawati, Zakaria
author_sort Farhana, Mohd Foudzi
title Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)
title_short Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)
title_full Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)
title_fullStr Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)
title_full_unstemmed Flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μMIM)
title_sort flow behavior characteristic for injection process using nano-yttria stabilized zirconia for micro metal injection molding (μmim)
publisher Trans Tech Publications
publishDate 2011
url http://dspace.unimap.edu.my/xmlui/handle/123456789/11510
_version_ 1643790185077407744
score 13.222552

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