Effects of Combustion Gas Species on Y2O3 Film Produced from EDTA·Y·H Complex by Flame-Spraying Technique

Yttria (Y 2 O 3 ) films were deposited on stainless steel substrates from ethylenediaminetetraacetic·yttrium·hydrogen (EDTA·Y·H) complexes by flame spraying. The gas mixtures of acetylene-oxygen (C 2 H 2 -O 2 ) or hydrogen-oxygen (H 2 -O 2 ) were used for the combustion flame and the effects of the combustion gas species on Y 2 O 3 films were investigated. Experiments revealed that the particles propelled in the H 2 -O 2 flame had lower temperature and higher velocity compared with the particles in the C 2 H 2 -O 2 flame. The existence of Y 2 O 3 crystalline phases and complete decomposition of the EDTA·Y·H were confirmed. The porosity of the film was 25% when the H 2 -O 2 flame was used and 32% when the C 2 H 2 -O 2 flame was used. In addition, the Y 2 O 3 films showed excellent adherability in tape tests. The H 2 -O 2 flame is thus considered suitable for fabricating dense Y 2 O 3 films.