Tantalum-45S5Bioglass composite foams prepared in thermal dealloying process

This paper presents a promising method of tantalum – bioglass porous composites preparation by thermal dealloying. The first step of this study was the Ta-Bioglass-Mg nanopowder preparation using the mechanical alloying process in a Spex shaker type mill. The next step was the formation of the green...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2019-06, Vol.81, p.58-62
Main Author: Adamek, G.
Format: Article
Language:English
Subjects:
Bioactive glass
Biocompatibility
Bioglass
Chemical composition
Cold pressing
Compacts
Composite materials
Dealloying
Magnesium
Mechanical alloying
Metallic-based foams
Morphology
Open spaces
Organic chemistry
Pore size distribution
Porosity
Sintering (powder metallurgy)
Tantalum
Tantalum based composites
Thermal dealloying
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Summary:This paper presents a promising method of tantalum – bioglass porous composites preparation by thermal dealloying. The first step of this study was the Ta-Bioglass-Mg nanopowder preparation using the mechanical alloying process in a Spex shaker type mill. The next step was the formation of the green compacts by cold pressing and then sintering and dealloying of magnesium. During the dealloying process, the magnesium diffuses from the middle to the surface of the sample, leaving open spaces surrounded by the composite scaffold. The porosity, pores morphology, structure, phase and chemical composition as well as cytotoxic activity have been investigated. The biocompatible Ta-2.5 wt% 45S5 Bioglass foam composites, of high porosity and wide pore size distribution have successfully been prepared as promising candidates for hard tissue implant applications. •Ta – 45S5 Bioglass composite foams were made using mechanical alloying and thermal dealloying of magnesium.•Nanostructure improve the dealloying process due to large grain boundaries.•The porous composites with controlled phase composition, with wide range of pore size distribution were develop.
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2019.02.016