Počet záznamů: 1  

X-ray Computed Tomographic Investigation of the Porosity and Morphology of Plasma Electrolytic Oxidation Coatings

  1. 1. 0465628 - UFM-A 2017 RIV US eng J - Článek v odborném periodiku
    Zhang, X. - Aliasghari, S. - Němcová, A. - Burnett, T.L. - Kuběna, Ivo - Šmíd, Miroslav - Thompson, G. - Skeldon, P. - Withers, P.J.
    X-ray Computed Tomographic Investigation of the Porosity and Morphology of Plasma Electrolytic Oxidation Coatings.
    ACS Applied Materials and Interfaces. Roč. 8, č. 13 (2016), s. 8801-8810. ISSN 1944-8244
    Grant CEP: GA MŠk(CZ) ED1.1.00/02.0068
    Institucionální podpora: RVO:68081723
    Klíčová slova: plasma electrolytic oxidation * porosity * scanning electron microscopy * titanium * X-ray computed tomography
    Kód oboru RIV: JK - Koroze a povrchové úpravy materiálů
    Impakt faktor: 7.504, rok: 2016
    http://pubs.acs.org/doi/abs/10.1021/acsami.6b00274

    Plasma electrolytic oxidation (PEO) is of increasing interest for the formation of ceramic coatings on metals for applications that require diverse coating properties, such as wear and corrosion resistance, low thermal conductivity, and biocompatibility. Porosity in the coatings can have an important impact on the coating performance. However, the quantification of the porosity in coatings can be difficult due to the wide range of pore sizes and the complexity of the coating morphology. In this work, a PEO coating formed on titanium is examined using high resolution X-ray computed tomography (X-ray CT). The observations are validated by comparisons of surface views and cross-sectional views of specific coating features obtained using X-ray CT and scanning electron microscopy. The X-ray CT technique is shown to be capable of resolving pores with volumes of at least 6 μm3. Furthermore, the shapes of large pores are revealed and a correlation is demonstrated between the locations of the pores, nodules on the coating surface, and depressions in the titanium substrate. The locations and morphologies of the pores, which constitute 5.7% of the coating volume, indicate that they are generated by release of oxygen gas from the molten coating.
    Trvalý link: http://hdl.handle.net/11104/0264166