Heat-shock properties in yttrium-oxide films synthesized from metal–ethylenediamine tetraacetic acid complex through flame-spray apparatus

Recently, a new deposition technique using a metal–ethylenediamine tetraacetic acid (EDTA) complex has been developed. In this study, the heat-shock properties of metal-oxide films synthesized from a metal–EDTA complex were investigated. Y 2 O 3 films were synthesized on stainless-steel (SUS) substrate from EDTA∙Y∙H through the combustion of H 2 –O 2 gas. A cyclic heat-shock test was conducted on the fabricated Y 2 O 3 films through exposure to the H 2 -O 2 flame. The existence of Y 2 O 3 crystals was confirmed. Surface cracks or damages were not observed in the samples after the cyclic thermal test. Although the number of cross-sectional cracks, crack lengths, and cracks per unit area was increased by the heat shock, delaminations were not observed in the Y 2 O 3 films. The results show that the prepared Y 2 O 3 films have high thermal-shock resistance and are suitable for use as thermal barrier coatings.