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| Abstract No.: |
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Scheduled at:
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Friday, May 23, 2014, Hall A 2:00 PM
Suspension Spraying 2
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| Title: |
Suspension spraying of partially stabilized zirconia for thermal barrier coatings
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| Authors: |
Philipp Müller* / University of Stuttgart
IFKB, Germany
Andreas Killinger / University of Stuttgart IFKB, Germany
Rainer Gadow/ University of Stuttgart IFKB, Germany
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| Abstract: |
Suspension thermal spray processes which uses fine and ultra fine powder particles is a new approach for manufacturing ceramic coatings exhibiting a refined microstructure. Two different spray processes - suspension plasma spraying (SPS) and high velocity suspension flame spraying (HVSFS) are under focus in the field of suspension spraying. Both techniques are suitable for manufacturing finely structured coatings but lead to rather different coating structures. Generally, HVSFS can lead to more dense coatings with low porosity values. With SPS on the other hand, coatings with a high volume fraction of porosity featuring a homogeneous pore structure is achievable.
One of the main fields of application for partially stabilized zirconia is the use as thermal barrier coating. Atmospheric plasma spraying (APS) is the state of the art thermal spray process for this application. In this study partially stabilized zirconia was sprayed with APS, SPS and HVSFS. Coatings were applied on planar steel substrates as well as on pistons for us as thermal barrier coatings in engines. The microstructure and properties of the coatings were analyzed.
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