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Please use this identifier to cite or link to this item: http://dspace.lib.cranfield.ac.uk/handle/1826/757

Document Type: Article
Title: Nano and Micro indentation studies of bulk zirconia and EB PVD TBCs
Authors: Wellman, R. G.
Dyer, A.
Nicholls, J. R.
Issue Date: 2004
Citation: R. G. Wellman, A. Dyer and J. R. Nicholls, Nano and Micro indentation studies of bulk zirconia and EB PVD TBCs, Surface and Coatings Technology, Volume 176, Issue 2, 1 January 2004, Pages 253-260.
Abstract: In order to model the erosion of a material it is necessary to know the material properties of both the impacting particles as well as the target. In the case of electron beam (EB) physical vapour deposited(PVD) thermal barrier coatings (TBCs) the properties of the columns as opposed to the coating as a whole are important. This is due to the fact that discrete erosion events are on a similar scale as the size of the individual columns. Thus nano* and micro* indentation were used to determine the hardness and the Young"s modulus of the columns. However, care had to be taken to ensure that it was the hardness of the columns that was being measured and not the coating as a whole. This paper discusses the differences in the results obtained when using the two different tests and relates them to the interactions between the indent and the columns of the EB PVD TBC microstructure. It was found that individual columns had a hardness of 14 GPa measured using nano indentation, while the hardness of the coating, using micro indentation decreased from 13 to 2.4 GPa as the indentation load increased from 0.1 to 3N. This decrease in hardness was attributed to the interaction between the indenter and a number of adjacent columns and the ability of the columns to move laterally under indentation.
URI: http://dx.doi.org/10.1016/S0257-8972(03)00737-0
Appears in Collections:Staff publications - School of Applied Sciences

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