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Elastic modulus measurements in plasma sprayed deposits

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Abstract

A commercial hardness indenter has been modified to record load displacement as a spherical ball is elastically loaded onto the surface of the material to be measured. The resulting data are used to calculate the elastic modulus. This technique has been used to characterize the elastic modulus of zirconium oxide-8% yttrium oxide plasma sprayed deposits. Moduli were measured both on the cross section and on the plan section, and the differences were correlated with the microstructure. Since relatively small areas of the material were sampled by the indenter, local mapping of elastic modulus variations on the size scale of the microstructure was possible. A periodic variation in modulus with position in the cross section was found on a length scale that corresponded to the average plasma spray pass thickness. Elastic modulus variations also have been found on a macro scale through the thickness of freestanding plasma sprayed deposits. These large scale variations were probably a result of self annealing during the production of these thick samples. Finally, significant increases in elastic modulus have been found in samples annealed for a total of 2.5 h at 1100 °C. These changes have been correlated with small angle neutron scattering measurements of void surface area.

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Author notes

  1. J. Ilavsky

    Present address: Institute of Plasma Physics, Prague, Czech Republic

Authors and Affiliations

  1. Ceramic Division, National Institute of Standards and Technology, Rm. A329, Bldg. 223, 20899, Gaithersburg, MD, USA

    J. S. Wallace & J. Ilavsky

Authors
  1. J. S. Wallace
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  2. J. Ilavsky
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Wallace, J.S., Ilavsky, J. Elastic modulus measurements in plasma sprayed deposits. J Therm Spray Tech 7, 521–526 (1998). https://doi.org/10.1361/105996398770350747

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  • DOI: https://doi.org/10.1361/105996398770350747

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