Template-assisted freeze casting of macroporous Ti6Al4V scaffolds with long-range order lamellar structure

•Macroporous Ti6Al4V scaffold was fabricated by template-assisted freeze casting.•Morphology and orientation of pores are determined by the used template.•Pore size decreases with increasing binder content in template slurry.•The macroporous scaffolds exhibit mechanical compatibility with bone tissu...

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Bibliographic Details
Published in:Materials letters 2020-04, Vol.264, p.127374, Article 127374
Main Authors: Chen, Zhuyin, Liu, Xinli, Shen, Ting, Wu, Chuanzong, Zhang, Lei
Format: Article
Language:English
Subjects:
Biomaterials
Freeze casting
Gelatin
Ice crystals
Ice formation
Lamellar structure
Long range order
Macropores
Materials science
Morphology
Porosity
Porous materials
Scaffolds
Slurries
Substrates
Template-assisted
Ti6Al4V scaffolds
Titanium base alloys
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Summary:•Macroporous Ti6Al4V scaffold was fabricated by template-assisted freeze casting.•Morphology and orientation of pores are determined by the used template.•Pore size decreases with increasing binder content in template slurry.•The macroporous scaffolds exhibit mechanical compatibility with bone tissues. A modified water-based freeze casting to fabricate long-range order lamellar Ti6Al4V scaffolds with macropores and high porosity has been developed by using the pre-frozen WS2 substrate as the template. Pores morphologies of the scaffolds relied on the previous ice crystal which had formed in templates and thus could be adjusted by altering the template structure. The decrease of gelatin in WS2 slurry transformed the bottom template from cell pore structure into the lamellar structure followed by improvement of lamellar orientation of the top Ti6Al4V scaffold. The pore widths of the scaffolds were in the range of 84–217 μm which were difficult to realize without the assisted template. The scaffolds also exhibited mechanical compatibility with bone tissues, indicating that the template-assisted freeze casting is a promising approach to fabricate macroporous Ti6Al4V implants.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2020.127374