Abstract
A nanostructured thermal barrier coating (TBC) was deposited by air plasma spraying. The effect of microstructural evolution on nano-hardness and Young’s modulus has been investigated by nanoindentation technique after exposure at 1200 °C in air for different times. The results showed that the sintering process of nanostructured TBC at 1200 °C was divided into two stages. TBC completely kept the nanostructure with the grain size <100 nm at the first stage of 10 h thermal exposure. The nanostructure was lost gradually at the second stage from 10 to 200 h thermal exposure. During the first stage, nano-hardness and Young’s modulus increased rapidly for TBC densification, and Weibull bimodal distribution of both Young’s modulus and nano-hardness disappeared as grain grew and most microcracks were healed. The structure of TBC did not change basically, and nano-hardness and Young’s modulus increased slightly at the second stage.
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Wu, Z., Ni, L., Yu, Q. et al. Effect of Thermal Exposure on Mechanical Properties of a Plasma-Sprayed Nanostructured Thermal Barrier Coating. J Therm Spray Tech 21, 169–175 (2012). https://doi.org/10.1007/s11666-011-9704-3
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DOI: https://doi.org/10.1007/s11666-011-9704-3