Flowability and moldability of zirconia micro-part via micro-powder injection molding
The micro-powder injection moulding process is a favourable process to produce micro-sized components of zirconia. The aim of this study is to study the flowability of zirconia feedstock and to ensure the moldability of micro-sized zirconia parts without any defects. To obtain the critical powder vo...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Penerbit Universiti Kebangsaan Malaysia
2024
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| Online Access: | http://journalarticle.ukm.my/25765/ http://journalarticle.ukm.my/25765/1/27i.pdf |
| _version_ | 1848816443437613056 |
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| author | Muhammad Mohamed Amin, Norhamidi Muhamad, Abu Bakar Sulong, Al Basir, Nur Aisyah Miza Ahmad Tamizi, |
| author_facet | Muhammad Mohamed Amin, Norhamidi Muhamad, Abu Bakar Sulong, Al Basir, Nur Aisyah Miza Ahmad Tamizi, |
| author_sort | Muhammad Mohamed Amin, |
| building | UKM Institutional Repository |
| collection | Online Access |
| description | The micro-powder injection moulding process is a favourable process to produce micro-sized components of zirconia. The aim of this study is to study the flowability of zirconia feedstock and to ensure the moldability of micro-sized zirconia parts without any defects. To obtain the critical powder volume percentage (CPVP), zirconia was deposited inside a Brabender mixer while oil was added gradually with an interval of three minutes. The value of 2,3 and 4 vol.% less than CPVP was mixed with palm stearin and low-density polyethylene (LDPE) binders to produce three feedstocks and run through a rheometer to test the flowability of each feedstock. The feedstock with the best flowability characteristic was then subjected to micro-powder injection moulding process through trial and error to achieve the optimum parameters for micro-sized zirconia part without any defects. The CPVP of zirconia achieved for this study was 49.92 vol.% in which the optimal loadings of 46 vol.%, 47 vol.% and 48 vol.% feedstocks were analysed using the rheometer. The results show that 46 vol.% feedstock was most suitable for producing zirconia micro-part without any defects compared to other powder loadings due to its low viscosity, high shear thinning, flow behaviour index less than 1 and low activation energy. Injection moulded zirconia micro-sized green parts without any defects were produced using the following parameters: 10 bar of injection pressure, 70 °C of mould temperature, 190 °C of melt temperature and 7 seconds of injection time, respectively. Zirconia micro-sized green parts regularly exhibited short-shot defects when mould temperatures less than 70 °C were applied. The results showed that by employing feedstocks containing 46 vol.% of zirconia, micro-sized zirconia parts without any defects can be produced successfully through the micro-powder injection moulding process. |
| first_indexed | 2025-11-15T01:05:57Z |
| format | Article |
| id | oai:generic.eprints.org:25765 |
| institution | Universiti Kebangasaan Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T01:05:57Z |
| publishDate | 2024 |
| publisher | Penerbit Universiti Kebangsaan Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | oai:generic.eprints.org:257652025-08-12T07:27:42Z http://journalarticle.ukm.my/25765/ Flowability and moldability of zirconia micro-part via micro-powder injection molding Muhammad Mohamed Amin, Norhamidi Muhamad, Abu Bakar Sulong, Al Basir, Nur Aisyah Miza Ahmad Tamizi, The micro-powder injection moulding process is a favourable process to produce micro-sized components of zirconia. The aim of this study is to study the flowability of zirconia feedstock and to ensure the moldability of micro-sized zirconia parts without any defects. To obtain the critical powder volume percentage (CPVP), zirconia was deposited inside a Brabender mixer while oil was added gradually with an interval of three minutes. The value of 2,3 and 4 vol.% less than CPVP was mixed with palm stearin and low-density polyethylene (LDPE) binders to produce three feedstocks and run through a rheometer to test the flowability of each feedstock. The feedstock with the best flowability characteristic was then subjected to micro-powder injection moulding process through trial and error to achieve the optimum parameters for micro-sized zirconia part without any defects. The CPVP of zirconia achieved for this study was 49.92 vol.% in which the optimal loadings of 46 vol.%, 47 vol.% and 48 vol.% feedstocks were analysed using the rheometer. The results show that 46 vol.% feedstock was most suitable for producing zirconia micro-part without any defects compared to other powder loadings due to its low viscosity, high shear thinning, flow behaviour index less than 1 and low activation energy. Injection moulded zirconia micro-sized green parts without any defects were produced using the following parameters: 10 bar of injection pressure, 70 °C of mould temperature, 190 °C of melt temperature and 7 seconds of injection time, respectively. Zirconia micro-sized green parts regularly exhibited short-shot defects when mould temperatures less than 70 °C were applied. The results showed that by employing feedstocks containing 46 vol.% of zirconia, micro-sized zirconia parts without any defects can be produced successfully through the micro-powder injection moulding process. Penerbit Universiti Kebangsaan Malaysia 2024-09 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/25765/1/27i.pdf Muhammad Mohamed Amin, and Norhamidi Muhamad, and Abu Bakar Sulong, and Al Basir, and Nur Aisyah Miza Ahmad Tamizi, (2024) Flowability and moldability of zirconia micro-part via micro-powder injection molding. Jurnal Kejuruteraan, 36 (5). pp. 2107-2114. ISSN 0128-0198 https://www.ukm.my/jkukm/volume-3605-2024/ |
| spellingShingle | Muhammad Mohamed Amin, Norhamidi Muhamad, Abu Bakar Sulong, Al Basir, Nur Aisyah Miza Ahmad Tamizi, Flowability and moldability of zirconia micro-part via micro-powder injection molding |
| title | Flowability and moldability of zirconia micro-part via micro-powder injection molding |
| title_full | Flowability and moldability of zirconia micro-part via micro-powder injection molding |
| title_fullStr | Flowability and moldability of zirconia micro-part via micro-powder injection molding |
| title_full_unstemmed | Flowability and moldability of zirconia micro-part via micro-powder injection molding |
| title_short | Flowability and moldability of zirconia micro-part via micro-powder injection molding |
| title_sort | flowability and moldability of zirconia micro-part via micro-powder injection molding |
| url | http://journalarticle.ukm.my/25765/ http://journalarticle.ukm.my/25765/ http://journalarticle.ukm.my/25765/1/27i.pdf |