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Appl. Sci. 2017, 7(1), 105; doi:10.3390/app7010105

Microporous Titanium through Metal Injection Moulding of Coarse Powder and Surface Modification by Plasma Oxidation

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, Baghdad 10066, Iraq
3
School of Materials, University of Manchester, Manchester M13 9PL, UK
4
National University of Science and Technology “MISIS”, Leninsky Prospect 4, Moscow 119049, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Volker Piotter
Received: 7 December 2016 / Revised: 12 January 2017 / Accepted: 16 January 2017 / Published: 22 January 2017
(This article belongs to the Special Issue Powder Injection Moulding)
View Full-Text   |   Download PDF [9601 KB, uploaded 22 January 2017]   |  

Abstract

Titanium is one of the most attractive materials for biomedical applications due to having excellent biocompatibility accompanied by good corrosion resistance. One popular processing technique for Ti is Metal Injection Moulding (MIM). However, there are several issues associated with the use of this technique, such as the high cost of the fine powder used, the high level of contamination and consequent alteration to material properties, as well as the large volume shrinkage that occurs during sintering. In this study, the use of a relatively coarse Ti powder with a mean particle size of 75 μm to process Ti parts with the potential for biomedical applications by MIM will be examined, compared to a commercial Ti feedstock, and subsequently coated using Plasma Electrolytic Oxidation (PEO). The results show that samples produced with the coarse powder shrink 35% less and have a relative density 14% less with an average pore size three-times larger than that of the commercial feedstock. This helps increase the potential competitiveness of MIM in the production of biomedical parts, as it reduces cost, shrinkage and results in more intentionally-induced micropores, such as are desired for biomedical implants. PEO treatment of the samples yields a thick rough coating comprised of a mixture of rutile and anatase with interconnected microporous channels and openings resembling the mouth of a volcanic crater. View Full-Text
Keywords: metal injection moulding; titanium; PolyMIM; plasma electrolytic oxidation; coating; porosity; micropores metal injection moulding; titanium; PolyMIM; plasma electrolytic oxidation; coating; porosity; micropores
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Menhal Shbeh, M.; Yerokhin, A.; Goodall, R. Microporous Titanium through Metal Injection Moulding of Coarse Powder and Surface Modification by Plasma Oxidation. Appl. Sci. 2017, 7, 105.

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