Journal Article

FZJ-2016-05455

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Atmospheric Plasma Spraying of Single Phase Lanthanum Zirconate Thermal Barrier Coatings with Optimized Porosity

Mauer, G. (Corresponding author)FZJ* ; Du, L. ; Vassen, R.FZJ*

2016
MDPI Basel

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Please use a persistent id in citations: http://hdl.handle.net/2128/12548  doi:10.3390/coatings6040049

Abstract: The shortcomings at elevated operation temperatures of the standard material yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs) have initiated many research activities seeking alternatives. One candidate is the pyrochlore lanthanum zirconate La2Zr2O7 (LZ), which is phase-stable to its melting point. At the same time, it shows a lower thermal conductivity and a lower sintering tendency when compared to YSZ. Because of its low thermal expansion coefficient and poor toughness, it is applied in combination with YSZ in double layer TBC systems. It is the current state of knowledge that LZ is prone to lanthanum depletion if processed by plasma spraying. The process conditions have to be selected carefully to avoid this. Furthermore, the amount and morphology of the coating porosity is essential for a good thermo-mechanical performance. In this work, the development and testing of LZ/YSZ double layer TBC systems is described. Initially, suitable basic parameters (torch, plasma gas composition, and power) were tested with respect to coating stoichiometry. Then, microstructures were optimized by adjusting feed rate, spray distance, and by selecting a more appropriate feedstock. Powder particles and coatings were characterized by digital image analysis.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)

Appears in the scientific report 2016

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Database coverage:
; ; ; Current Contents - Engineering, Computing and Technology ; DOAJ Seal ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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