Nanostructured partially stabilized zirconia as an interlayer in a multi layered thermal barrier coating

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Title: Nanostructured partially stabilized zirconia as an interlayer in a multi layered thermal barrier coating
Author(s): Guru, D.; Heberlein, J.; Mook, W.; Gerberich, W.; Berndt, C.
Abstract: Stresses developed within a thermal barrier coating (TBC) due to the mismatch in thermal expansion of different coating components can cause coating failure. Nanostructured materials have an increased volume fraction of grain boundaries and this microstructural attribute may allow coatings to relieve the strain in the coating structure thereby improving the effectiveness and the lifetime of the TBC. Multi - layered TBCs were prepared using two techniques; atmospheric pressure plasma spray (APS) using a commercial system, and reduced pressure plasma spray using the Triple Torch Plasma Reactor (TTPR). The coatings were deposited on mullite and on NiCrAlY-coated steel substrates, and consisted of an inter - layer of nano-phase partially stabilized zirconia (n - PSZ) and a layer of conventional partially yttria stabilized zirconia coating (c - YSZ) as the top thermal barrier coat. The coatings were heat treated at various temperatures and the microstructural changes analyzed using scanning electron microscopy (SEM) images. Mechanical properties of the coating were studied using four point bend testing to better understand the effect of the n-PSZ inter-layer on the strain relief mechanisms that may be operative within the TBC.
Publication type: Conference paper
Source: Proceedings of 'Thermal Spray 2006: Science, Innovation, and Application', the 2006 International Thermal Spray Conference (ITSC 2006) / B.R. Marple, M.M. Hyland, Y-C. Lau, R.S. Lima, and J. Voyer (eds.), pp. 453-457
Publication year: 2006
Keyword(s): Nanostructured materials; TBC; Thermal barrier coatings; Yttria stabilized zirconia coating
Publisher: ASM International
Publisher URL: http://asmcommunity.asminternational.org/
Peer reviewed