Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Johanna Ekberg is active.

Publication


Featured researches published by Johanna Ekberg.


Materials Science Forum | 2016

EBSD Analysis and Assessment of Porosity in Thermal Barrier Coatings Produced by Axial Suspension Plasma Spraying (ASPS)

Uta Klement; Johanna Ekberg; Ashish Ganvir

Axial suspension plasma spraying (ASPS) is a relatively new, innovative spraying technique which has produced thermal barrier coatings (TBCs) with attractive properties such as high durability and low thermal conductivity. Using a suspension, it is possible to spray with finer powder particles resulting in coatings that have a columnar microstructure and contain a wide range of pore sizes, both nm-and μm-sized pores. To optimize the thermal properties and to maintain them during service of the components, it will be important to design TBCs with optimal porosity. Hence, an important part in the assessment of ASPS coatings is therefore the characterization of the microstructure and how it is build up, and the determination of porosity. Both aspects are addressed by performing measurement on splats and ASPS-coating using electron backscatter diffraction (EBSD) technique and by measuring porosity by Mercury Intrusion Porosimetry (MIP).


Surface Engineering | 2018

Analysis of single splats produced by axial suspension plasma spraying

Johanna Ekberg; Uta Klement; Stefan Björklund

ABSTRACT Axial suspension plasma spraying (ASPS) is a relatively new, innovative technique with which microstructures have been produced that are similar to the ones produced by electron beam physical vapor deposition. They have a columnar structure and consist of nm- and µm-sized pores. However, so far the formation of the microstructure is not fully understood because fragmentation and vaporisation of the liquid significantly affects the deposition process. Analysis of single splats can provide important information on the phenomena controlling the coating formation process and the final coating properties. Therefore, the present study aims at providing first results of 8 wt-% yttria-stabilised zirconia single splats sprayed onto a steel substrate by use of ASPS. Scanning electron microscopy and atomic force microscopy have been used to characterise the splats with respect to appearance, shape, and size distribution.


Journal of Coatings Technology and Research | 2018

Porosity measurements in suspension plasma sprayed YSZ coatings using NMR cryoporometry and X-ray microscopy

Uta Klement; Johanna Ekberg; Simone Creci; Stephen T. Kelly

A large variety of coatings are used to protect structural engineering materials from corrosion, wear, and erosion, and to provide thermal insulation. In this work, yttria-stabilized zirconia coatings produced by suspension plasma spraying were investigated with respect to their microstructure and especially their porosity, as the porosity affects the thermal insulation of the underlying component. To determine porosity, pore size distribution, and pore shape, the coatings were investigated using novel advanced characterization techniques like NMR cryoporometry and X-ray microscopy. In general, the porosity is inhomogeneously distributed and the coatings showed a large variety of pore sizes ranging from a few nanometers to micrometers.


Fuel Cells | 2016

Metallic Bipolar Plates for High Temperature Polymer Electrolyte Membrane Fuel Cells

Patrik Alnegren; Jan Gustav Grolig; Johanna Ekberg; Gert Göransson; Jan-Erik Svensson


Journal of Thermal Spray Technology | 2017

3D Analysis of Porosity in a Ceramic Coating Using X-ray Microscopy

Uta Klement; Johanna Ekberg; Stephen T. Kelly


Surface & Coatings Technology | 2017

Porosity investigation of yttria-stabilized zirconia topcoats using NMR cryoporometry

Johanna Ekberg; Lars Nordstierna; Uta Klement


Journal of Thermal Spray Technology | 2018

The Influence of Heat Treatments on the Porosity of Suspension Plasma-Sprayed Yttria-Stabilized Zirconia Coatings

Johanna Ekberg; Ashish Ganvir; Uta Klement; Simone Creci; Lars Nordstierna


Resources Conservation and Recycling | 2017

'All They Do Is Win': Lessons learned from use of a serious game for Circular Economy education

Katherine Whalen; Cecilia Berlin; Johanna Ekberg; Ilaria Giovanna Barletta; Peter Hammersberg


Proceedings of Coating Science International (COSi) 2017 | 2017

Porosity measurements in suspension plasma sprayed YSZ coatings

Uta Klement; Johanna Ekberg; Simone Creci; Stephen T. Kelly


Archive | 2017

Investigation of microstructure and porosity of columnar yttria-stabilized zirconia coatings produced by axial suspension plasma spraying

Johanna Ekberg

Collaboration


Dive into the Johanna Ekberg's collaboration.

Top Co-Authors

Avatar

Uta Klement

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Simone Creci

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Lars Nordstierna

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Stephen T. Kelly

Lawrence Berkeley National Laboratory

View shared research outputs
Top Co-Authors

Avatar

Cecilia Berlin

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Ilaria Giovanna Barletta

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Jan Gustav Grolig

Chalmers University of Technology

View shared research outputs
Top Co-Authors

Avatar

Jan-Erik Svensson

Chalmers University of Technology

View shared research outputs
Researchain Logo
Decentralizing Knowledge