Formation and Properties of Biomedical Ti-Ta Foams Prepared from Nanoprecursors by Thermal Dealloying Process.

Autor: Adamek G; Poznan University of Technology, Institute of Materials Science and Engineering, Jana Pawla II 24, 61-138 Poznan, Poland. grzegorz.adamek@put.poznan.pl., Kozlowski M; Poznan University of Technology, Institute of Materials Science and Engineering, Jana Pawla II 24, 61-138 Poznan, Poland., Jurczyk MU; Division Mother's and Child's Health, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan, Poland., Wirstlein P; Department of Gynecology and Obstetrics, Division of Reproduction, Poznan University of Medical Sciences, Polna 33, 60-535 Poznan, Poland., Zurawski J; Department of Immunobiochemistry, Chair of Biology and Environmental Sciences, Poznan University of Medical Sciences, Rokietnicka 8, 60-806 Poznan, Poland., Jakubowicz J; Poznan University of Technology, Institute of Materials Science and Engineering, Jana Pawla II 24, 61-138 Poznan, Poland.
Jazyk: angličtina
Zdroj: Materials (Basel, Switzerland) [Materials (Basel)] 2019 Aug 22; Vol. 12 (17). Date of Electronic Publication: 2019 Aug 22.
DOI: 10.3390/ma12172668
Abstrakt: The paper presents a promising method of preparation of titanium-based foams by the thermal dealloying method. The first step of this study was the Ti-Ta-Mg based nanopowder preparation using the mechanical alloying (MA) process performed at room temperature. The next step was forming the green compacts by cold pressing and then sintering with magnesium dealloying from the titanium-based alloy structure. The mechanism of the porous structure formation was based on the removal of magnesium from the titanium alloy at a temperature higher than the boiling point of magnesium (1090 °C). The influence of the Mg content on the formation of the porous Ti-30Ta foam has been investigated. The sintering stage was performed in vacuum. During the dealloying process, the magnesium atoms diffuse from the middle to the surface of the sample and combine to form vapors and then evaporate leaving pores surrounded by the metallic scaffold. The porosity, the mechanical properties as well as biocompatibility have been investigated. The titanium-based foam of high porosity (up to 76%) and the pore size distribution from nano- to micro-scale have been successfully prepared. For the medical applications, the Ti-Ta metallic foams have shown a positive behavior in the MTT test. The as-shown results clearly exhibit a great potential for thermal dealloying in the preparation of porous structures.
Databáze: MEDLINE
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