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Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores

Paper ID Volume ID Publish Year Pages File Format Full-Text
729 60 2012 10 PDF Available
Title
Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores
Abstract

Highly porous titanium with aligned large pores up to 500 μm in size, which is suitable for scaffold applications, was successfully fabricated using the reverse freeze casting method. In this process we have newly developed, the Ti powders migrated spontaneously along the pre-aligned camphene boundaries at a temperature of 45.5 °C and formed a titanium–camphene mixture with an aligned structure; this was followed by freeze drying and sintering. As the casting time increased from 24 to 48 h, the initial columnar structures turned into lamellar structures, with the porosity decreasing from 69 to 51%. This reduction in porosity caused the compressive yield strength to increase from 121 to 302 MPa, with an elastic modulus of the samples being in the range of 2–5 GPa. In addition, it was demonstrated that reverse freeze casting can also be successfully applied to various other raw powders, suggesting that the method developed in this work opens up new avenues for the production of a range of porous metallic and ceramic scaffolds with highly aligned pores.

Keywords
Scaffold; Freeze casting; Aligned pores; Titanium (Ti); Mechanical properties
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Reverse freeze casting: A new method for fabricating highly porous titanium scaffolds with aligned large pores
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 8, Issue 6, July 2012, Pages 2401–2410
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us