Nano and Micro indentation studies of bulk zirconia and EB PVD TBCs

Show simple item record Wellman, R. G. - Dyer, A. - Nicholls, John R. - 2011-02-07T23:08:37Z 2011-02-07T23:08:37Z 2004-01-01T00:00:00Z -
dc.identifier.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. en_UK
dc.identifier.issn 0257-8972 -
dc.identifier.uri -
dc.description.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. en_UK
dc.language.iso en_UK en_UK
dc.publisher Elsevier Science B.V., Amsterdam. en_UK
dc.subject EB en_UK
dc.subject PVD en_UK
dc.subject TBCs en_UK
dc.subject microhardness en_UK
dc.subject nanohardness en_UK
dc.title Nano and Micro indentation studies of bulk zirconia and EB PVD TBCs en_UK
dc.type Article en_UK

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