Mechanical Behavior of Bi-Layer and Dispersion Coatings Composed of Several Nanostructures on Ti Substrate

Andrzej Zieliński,Dorota Rogala-Wielgus,Beata Majkowska-Marzec,Bartłomiej J Jankiewicz

doi:10.3390/app11177862

Andrzej Zieliński, Dorota Rogala-Wielgus + Show 2 more

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https://doi.org/10.3390/app11177862

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Abstract

Three coatings suitable for biomedical applications, including the dispersion coating composed of multi-wall carbon nanotubes (MWCNTs), MWCNTs/TiO2 bi-layer coating, and MWCNTs-Cu dispersion coating, were fabricated by electrophoretic deposition (EPD) on Ti Grade II substrate. Optical microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and nanoindentation were applied to study topography, chemical, and phase composition, roughness, hardness, Young’s modulus, plastic, and elastic behavior. The results showed that the best mechanical properties in terms of biomedical application were achieved for the MWCNTs coating with titania outer layer. Nevertheless, both the addition of nanocopper and titania improved the mechanical resistance of the base MWCNTs coating. Compared to our previous experiments on Ti13Nb13Zr alloy, a general tendency is observed to form more homogenous coatings on pure metal than on the alloy, in which chemical and phase compositions are more complex.

Highlights

The carbon nanotubes (CNTs) belong to highly promising functional materials due to their extraordinary properties as electrical semiconductivity, high mechanical stiffness, tensile strength, high elasticity, significant thermal conductivity, and, in certain conditions, superconductivity [1,2]
The CNTs may appear in different forms as single, double, and multi-wall carbon nanotubes (MWCNTs) [3], nanohorns, and nanobuds [1]
The typical recent examples include cellulose—CNTs for methylene adsorption [7], nitrogen-doped graphene—CNTs for microwave absorption [8], polypyrrole—CNTs for storage devices [9], ZnO—CNTs dispersed in PU for better anti-corrosion resistance [10], cement [11,12], and Al alloy reinforced with CNTs [13]

Summary

Introduction

The carbon nanotubes (CNTs) belong to highly promising functional materials due to their extraordinary properties as electrical semiconductivity, high mechanical stiffness, tensile strength, high elasticity, significant thermal conductivity, and, in certain conditions, superconductivity [1,2]. The CNTs may appear in different forms as single-, double-, and multi-wall carbon nanotubes (MWCNTs) [3], nanohorns, and nanobuds [1]. They find applications in different fields as many branches of nanotechnology, nanomedicine, membranes and biosensors, electrochemical, piezoelectric and gas sensors, capacitors, and transistors in electronics [3], and high-performance batteries [4,5]. The specific optical and electrical properties, high specific surface area, high chemical activity, and significant mechanical behavior are the reasons for the development of a great number of such composite materials [14,15]

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