Study of metal injection molding of highly porous titanium by physical modeling and direct experiments |
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| Affiliation: | 1. School of Engineering, University of Waikato, Hamilton 3240, New Zealand;2. Department of Chemical and Materials Engineering, University of Auckland, Auckland 1142, New Zealand;1. Department of Mechanical and Materials Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia;2. Department of Physics, COMSATS Institute of Information Technology, Lahore, Pakistan;3. Department of Mechanical, Gonbad Kavoos Branch, Islamic Azad University, Gonbad Kavoos, Iran;1. Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield S1 3JD, UK;2. Department of Production Engineering and Metallurgy, University of Technology, Al-Sinaa'' Street, 10066, Baghdad, Iraq |
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| Abstract: | The prospects of metal injection molding (MIM) technique for manufacturing of highly porous titanium parts was studied by physical modeling, based on feedstock warm compaction experiments. The space holder method and typical MIM binder were used in all cases of the study. The influence of the starting powder (dehydrided and atomized) in feedstock on resulting properties of porous titanium was investigated. The size of space holder particles and space holder amount were adjusted to obtain porosity and pore size desired for medical implants application. NaCl and KCl were studied and compared as prospective space holder materials. The porous samples were characterized regarding their microstructure, uptake of interstitial contents and mechanical properties. For comparison, same investigations have been conducted on samples, which were prepared by established space holder technology based on cold isostatic pressing (CIP) and sintering. Finally, first direct MIM experiments and attempts of feedstock optimization were carried out. The peculiarities and problems of metal injection molding of highly porous titanium have been discussed. |
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| Keywords: | Titanium foam Space holder Metal injection molding Warm compaction Young's modulus Yield stress |
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