Abstract：Y2O3 coating was prepared on aluminum substrate using plasma spraying with argon as primary gas. Structure and morphology were studied using X-ray diffraction, scanning electron microscopy and metallographic analysis. The results show that the porosity of Y2O3 coating is 5.6%. Coating prepared with helium as secondary gas is purely white. However, there are black spots when hydrogen is used as secondary gas. A phase transformation from cubic to monoclinic tends to take place during the spraying operation under argon and hydrogen atmosphere. However this prejudicial transformation can be suppressed by helium instead of hydrogen.
Key words：plasma spraying; yttrium oxide coatings; reducibility; phase transformation
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