Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings

Pfeiffer C, Affeldt E, Göken M (2011)

Publication Type: Journal article

Publication year: 2011

Journal

Surface & Coatings Technology Elsevier

Book Volume: 205

Pages Range: 3245-3250

Journal Issue: 10

DOI: 10.1016/j.surfcoat.2010.11.047

Abstract

The elastic properties of thermal barrier coatings (TBCs) are important for modelling the lifetime of these coatings. A new test setup has been developed to measure the system modulus of electron-beam enhanced physical vapour deposited (EB-PVD) TBC coatings by miniaturized bend tests. Due to the brittleness, low stiffness and small thickness of the top coat and its complex microstructure, it is difficult to measure its Young's modulus by standard mechanical testing. For this reason, a special sample material has been prepared which consists of a 1~mm thick layer of EB-PVD TBC. This material was isothermally heat treated for different times at 950~°C, 1100~°C and 1200~°C and then tested in a specially developed miniaturized bend test. The bend test setup permits mechanical tests with a high resolution in stress and strain, where the strain is measured by digital image correlation. So the stiffness of the free-standing TBC samples could be measured with a high accuracy and the sintering behaviour of the EB-PVD TBC and the consequent rise of Young's modulus could be determined. The results show a significant increase of the system modulus with heat treatment time and temperature caused by sintering of the coating. An activation energy of 220~kJ/mol for the process has been determined. In addition, the material was tested by nanoindentation in order to measure Young's modulus on a local scale, and the porosity of the samples was determined by quantitative image analysis.

Authors with CRIS profile

Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

In-situ nanomechanics and FIB tomography of thin films (EXC315 EAM (A2-3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017 GRK 1229: Stabile und metastabile Mehrphasensysteme bei hohen Anwendungstemperaturen April 1, 2006 - March 30, 2015

Involved external institutions

MTU Aero Engines AG DE Germany (DE)

How to cite

APA:

Pfeiffer, C., Affeldt, E., & Göken, M. (2011). Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings. Surface & Coatings Technology, 205(10), 3245-3250. https://doi.org/10.1016/j.surfcoat.2010.11.047

MLA:

Pfeiffer, Carolin, Ernst Affeldt, and Mathias Göken. "Miniaturized bend tests on partially stabilized EB-PVD ZrO2 thermal barrier coatings." Surface & Coatings Technology 205.10 (2011): 3245-3250.

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