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Materials 2018, 11(9), 1573; https://doi.org/10.3390/ma11091573

Porous Titanium Scaffolds Fabricated by Metal Injection Moulding for Biomedical Applications

1
Queensland Centre for Advanced Materials Processing and Manufacturing (AMPAM), School of Mechanical and Mining Engineering, The University of Queensland, St Lucia, QLD 4072, Australia
2
Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
3
School of Engineering, Centre for Additive Manufacturing, RMIT University, Melbourne, VIC 3000, Australia
*
Author to whom correspondence should be addressed.
Received: 1 August 2018 / Revised: 14 August 2018 / Accepted: 24 August 2018 / Published: 1 September 2018
(This article belongs to the Section Biomaterials)
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Abstract

Biocompatible titanium scaffolds with up to 40% interconnected porosity were manufactured through the metal injection moulding process and the space holder technique. The mechanical properties of the manufactured scaffold showed a high level of compatibility with those of the cortical human bone. Sintering at 1250 °C produced scaffolds with 36% porosity and more than 90% interconnected pores, a compressive yield stress of 220 MPa and a Young’s modulus of 7.80 GPa, all suitable for bone tissue engineering. Increasing the sintering temperature to 1300 °C increased the Young’s modulus to 22.0 GPa due to reduced porosity, while reducing the sintering temperature to 1150 °C lowered the yield stress to 120 MPa, indicative of insufficient sintering. Electrochemical studies revealed that samples sintered at 1150 °C have a higher corrosion rate compared with those at a sintering temperature of 1250 °C. Overall, it was concluded that sintering at 1250 °C yielded the most desirable results. View Full-Text
Keywords: titanium; metal injection moulding; space holder; scaffold; mechanical properties; corrosion titanium; metal injection moulding; space holder; scaffold; mechanical properties; corrosion
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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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Dehghan-Manshadi, A.; Chen, Y.; Shi, Z.; Bermingham, M.; StJohn, D.; Dargusch, M.; Qian, M. Porous Titanium Scaffolds Fabricated by Metal Injection Moulding for Biomedical Applications. Materials 2018, 11, 1573.

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