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Mesoscopic Nonlinear Elastic Modulus of Thermal Barrier Coatings Determined by Cylindrical Punch Indentation
Author(s) -
Eldridge Jeffrey I.,
Zhu Dongming,
Miller Robert A.
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb01087.x
Subject(s) - materials science , composite material , indentation , knoop hardness test , thermal barrier coating , elastic modulus , mesoscopic physics , hysteresis , microstructure , coating , modulus , indentation hardness , physics , quantum mechanics
Cylindrical punch indentations are performed to determine the effective modulus of a plasma‐sprayed ZrO 2 –8 wt% Y 2 O 3 thermal barrier coating (TBC) as a function of coating depth. Cylindrical punch indentations offer significant advantages over pointed (Vickers, Berkovich, or Knoop) indentations for materials that do not exhibit linear elastic behavior. Cyclic loading with a cylindrical punch clearly shows the TBCs to exhibit nonlinear elastic behavior with significant hysteresis that is related to the compaction and internal sliding within the plasma‐spray splat microstructure. Also, the effect of a high‐heat‐flux laser treatment is shown to produce a gradient both in the effective TBC modulus and degree of loading/unloading hysteresis with depth.