Tribo-functional PVD thin films deposited onto additively manufactured Ti6Al7Nb for biomedical applications

[Display omitted] •PVD thin films considerably reduce the wear of additively manufactured Ti6Al7Nb.•Wear of Al2O3 is considerably lowered by applying PVD thin films on Ti6Al7Nb.•Among the PVD films, a–C and a–C:Ag exhibit the lowest friction against Al2O3. For biomedical applications, the additive m...

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Bibliographic Details
Published in:Materials letters 2022-08, Vol.321, p.132384, Article 132384
Main Authors: Tillmann, Wolfgang, Lopes Dias, Nelson Filipe, Kokalj, David, Stangier, Dominic, Hein, Maxwell, Hoyer, Kay-Peter, Schaper, Mirko, Gödecke, Daria, Oltmanns, Hilke, Meißner, Jessica
Format: Article
Language:English
Subjects:
Adhesion
Adhesive strength
Aluminum oxide
Biomedical materials
Carbon
Coefficient of friction
Laser power bed fusion
Magnetron sputtering
Materials science
Mechanical properties
Physical vapor deposition
Powder beds
Silver
Substrates
Surgical implants
Thin Film
Thin films
Ti6Al7Nb
Titanium base alloys
Titanium carbonitride
Titanium nitride
Tribological properties
Tribology
Wear
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Summary:[Display omitted] •PVD thin films considerably reduce the wear of additively manufactured Ti6Al7Nb.•Wear of Al2O3 is considerably lowered by applying PVD thin films on Ti6Al7Nb.•Among the PVD films, a–C and a–C:Ag exhibit the lowest friction against Al2O3. For biomedical applications, the additive manufacturing of titanium-based alloys in combination with a subsequent physical vapor deposition (PVD) of tribo-functional thin films enables producing complex-shaped implants and devices with improved tribological behavior. Titanium nitride (TiN), titanium carbonitride (TiCN), amorphous carbon (a-C), and Ag-containing amorphous carbon (a–C:Ag) thin films were coated on laser powder bed fused (L-PBF) Ti6Al7Nb substrates by magnetron sputtering. TiN exhibits a high adhesion on Ti6Al7Nb, whereas TiCN, a–C, and a–C:Ag have a lower adhesion strength. In lubricated tribometer tests against Al2O3, the PVD thin films are highly effective in improving the tribological properties of additively manufactured Ti6Al7Nb. TiCN, a–C, and a–C:Ag show lower friction than uncoated Ti6Al7Nb and TiN, with a–C and a–C:Ag having the lowest coefficients of friction. Compared to uncoated Ti6Al7Nb, the PVD films also considerably reduce both the wear and counterpart wear.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.132384