Abstract
Abstract The production of FeAl 2 O 4 matrix composite coatings based on Fe 2 O 3 –Al–Me x O y systems by reactive plasma spraying was achieved. The influence of oxides addition (Al 2 O 3 , Cr 2 O 3 , Fe 3 O 4 and SiO 2 ) on the reaction of Fe 2 O 3 –Al composite powders in plasma flame was investigated. The results showed that chemical reactions occurred in Fe 2 O 3 –Al–Me x O y composite powders during plasma spraying. The reaction products were different from that of the equilibrium reaction condition. The as-fabricated composite coatings were mainly composed of FeAl 2 O 4 , α-Fe and Al 2 O 3 . Introduction of the oxide additives affected the reaction process of Fe 2 O 3 –Al system. Oxides addition reduced the reaction heat release of Fe 2 O 3 –Al system and improved the initial reaction temperature. The main phase FeAl 2 O 4 in the five composite coatings was actually mixed hercynite containing different proportion of Fe and Al elements. The normal hercynite contained more Al and the inverse hercynite contained more Fe. The addition of the additives was beneficial to improve the content of the normal hercynite.
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