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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.
Materials 2018, 11(9), 1573; https://doi.org/10.3390/ma11091573
Received: 1 August 2018 / Revised: 14 August 2018 / Accepted: 24 August 2018 / Published: 1 September 2018
(This article belongs to the Section Biomaterials)
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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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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