Use of indentation technique to measure elastic modulus of plasma-sprayed zirconia thermal barrier coating | Zendy

J. P. Singh | Zendy; M. Sutaria | Zendy; Mattison K. Ferber | Zendy

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Use of indentation technique to measure elastic modulus of plasma-sprayed zirconia thermal barrier coating

Author(s) -

J. P. Singh,

M. Sutaria,

Mattison K. Ferber

Publication year - 1997

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/459439

Subject(s) - knoop hardness test , materials science , indentation , thermal barrier coating , composite material , cubic zirconia , elastic modulus , yttria stabilized zirconia , coating , nanoindentation , modulus , stress (linguistics) , porosity , indentation hardness , ceramic , microstructure , linguistics , philosophy

Elastic modulus of an yttria partially stabilized zirconia (YSZ) thermal barrier coating (TBC) was evaluated with a Knoop indentation technique. The measured elastic modulus values for the coating ranged from 68.4 {+-} 22.6 GPa at an indentation load of 50 g to 35.7 {+-} 9.8 at an indentation load of 300 g. At higher loads, the elastic modulus values did not change significantly. This steady-state value of 35.7 GPa for ZrO{sub 2} TBC agreed well with literature values obtained by the Hertzian indentation method. Furthermore, the measured elastic modulus for the TBC is lower than that reported for bulk ZrO{sub 2} ({approx} 190 GPa). This difference is believed to be due to the presence of a significant amount of porosity and microcracks in the TBCs. Hardness was also measured

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