Abstract
In nature bio-composites such as nacre show remarkable mechanical properties due to their complex hierarchical structure and high-volume fraction of its hard component. These composites are highly interesting for structural applications in different branches of industries for mechanical engineering and process technology. The aim of this work was to provide a scalable method for the production of highly filled composites by mimicking the structure of bio-composites. Therefore, composites from iron oxide (Fe2O3) and SBC-polymer (styrene-butadiene block copolymer) were fabricated by using a miniaturized spouted bed with an innovative fluidization gap design. Small iron oxide particles (25–45 μm) were fluidized in the spouted bed and coated with a polymer solution via a bottom spray nozzle. Afterwards the coated granules were hot-pressed and the mechanical properties of the obtained composites were tested. By this method composites with a bending strength of up to 6 MPa were fabricated. Although the mechanical properties of these artificial composites are still lower than those of the natural role models, it was shown that the spouted bed is a suitable technique for the fabrication of highly filled composites. For further optimization of the mechanical properties more complex and tailor-made starting materials will be used in following studies.
Highlights
Composites are materials which consist of two or more components, where one phase is the continuous matrix and the other phase is embedded discontinuously [1]
In totaland eight experiments were realized with the miniaturized spouted bed for this study
In total eight experiments were realized with the miniaturized spouted bed for this study
Summary
Composites are materials which consist of two or more components, where one phase is the continuous matrix and the other phase is embedded discontinuously [1]. Natural composite materials like bones, teeth, and nacre show remarkable mechanical properties due to their complex hierarchical and graded structure and high-filling degrees of the hard constituent. Natural hard tissues are usually composites consisting of hard ceramic particles such as aragonite embedded in a soft polymer matrix. The mechanical properties of the composite often exceed those of the single components. There are more examples of natural composites which show those remarkable mechanical properties like bone or teeth, in which the hard constituent is hydroxyapatite
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