Plazmochemická redukce a karbidace ilmenitu

Abstract

Plasma spraying is a thermal spraying method applied mostly to produce coatings and functionally graded materials. Plasma spraying of ilmenite free-standing parts and coatings on metallic substrates has been mastered at IPP Praha. This report concerns compact ilmenite parts undergoing a reduction in hydrogen plasma, inductively and capacitive generated. In accordance with theoretical predictions, metallic iron was selectively reduced from ilmenite, while any form of hydrogen present in the plasma did not reduce titania. After the reduction, the products did not change their dimensions and shape, apart from a minute contraction (whose extent is now being measured). The thermal expansion coefficient of ilmenite is 9,98.10-6 K-1 in the 100-750°C range; for our products, it is slightly lower. The goal of further research is to find conditions to obtain anatase structure of the titania in the formed composite