Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis
The comprehensive properties of a feedstock have a critical influence on the powder injection molding process. Proper feedstock with homogeneous structure, favorable flow characteristic, and moldability is the prerequisite for obtaining a final part with excellent comprehensive properties. The objec...
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| Format: | Article |
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/8026545 |
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| author | Jiaqi Ni Keqing Han Muhuo Yu |
| author_facet | Jiaqi Ni Keqing Han Muhuo Yu |
| author_sort | Jiaqi Ni |
| collection | DOAJ |
| description | The comprehensive properties of a feedstock have a critical influence on the powder injection molding process. Proper feedstock with homogeneous structure, favorable flow characteristic, and moldability is the prerequisite for obtaining a final part with excellent comprehensive properties. The objective of the present work was to develop an optimal feedstock for fabrication of hypereutectic AlSi (20 wt.%) alloy parts by the powder injection molding technique. For this purpose, micron-sized hypereutectic AlSi (20 wt.%) alloy powder was mixed with different amounts of a binder which consisted of 35 wt.% high-density polyethylene, 62 wt.% carnauba wax, and 3 wt.% stearic acid. The binder contents of the feedstocks were in the range from 13 wt.% to 21 wt.%. The influences of binder content, shear rate, and temperature on the rheological behaviors of feedstocks have been investigated via a capillary rheometer. The feedstock with 21 wt.% binder exhibited a variable flow behavior and was culled. The rest of the feedstocks showed a pseudoplastic behavior. Comprehensive analysis of rheological parameters such as the flow behavior index, yield stress, flow activation energy, and the general moldability index, the feedstock with 17 wt.% binder exhibited the best rheological performance and favorable moldability. The molded part with 17 wt.% binder had constant density, good shape retention, and stiffness as well as homogeneous distribution of the powder and binder. After solvent debinding, the debound item showed a homogeneous porous structure which is suitable for the subsequent thermal debinding and sintering processes. |
| format | Article |
| id | doaj-art-c5e9fb2860e34f7f9090bd239263e561 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-c5e9fb2860e34f7f9090bd239263e5612025-02-03T01:11:49ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/80265458026545Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological AnalysisJiaqi Ni0Keqing Han1Muhuo Yu2State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, ChinaThe comprehensive properties of a feedstock have a critical influence on the powder injection molding process. Proper feedstock with homogeneous structure, favorable flow characteristic, and moldability is the prerequisite for obtaining a final part with excellent comprehensive properties. The objective of the present work was to develop an optimal feedstock for fabrication of hypereutectic AlSi (20 wt.%) alloy parts by the powder injection molding technique. For this purpose, micron-sized hypereutectic AlSi (20 wt.%) alloy powder was mixed with different amounts of a binder which consisted of 35 wt.% high-density polyethylene, 62 wt.% carnauba wax, and 3 wt.% stearic acid. The binder contents of the feedstocks were in the range from 13 wt.% to 21 wt.%. The influences of binder content, shear rate, and temperature on the rheological behaviors of feedstocks have been investigated via a capillary rheometer. The feedstock with 21 wt.% binder exhibited a variable flow behavior and was culled. The rest of the feedstocks showed a pseudoplastic behavior. Comprehensive analysis of rheological parameters such as the flow behavior index, yield stress, flow activation energy, and the general moldability index, the feedstock with 17 wt.% binder exhibited the best rheological performance and favorable moldability. The molded part with 17 wt.% binder had constant density, good shape retention, and stiffness as well as homogeneous distribution of the powder and binder. After solvent debinding, the debound item showed a homogeneous porous structure which is suitable for the subsequent thermal debinding and sintering processes.http://dx.doi.org/10.1155/2018/8026545 |
| spellingShingle | Jiaqi Ni Keqing Han Muhuo Yu Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis Advances in Materials Science and Engineering |
| title | Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis |
| title_full | Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis |
| title_fullStr | Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis |
| title_full_unstemmed | Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis |
| title_short | Development of Hypereutectic AlSi Alloy Powder Injection Molding Feedstocks by Rheological Analysis |
| title_sort | development of hypereutectic alsi alloy powder injection molding feedstocks by rheological analysis |
| url | http://dx.doi.org/10.1155/2018/8026545 |
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