PLASMA SPRAYING OF MAGNETITE COATINGS FOR MW APPLICATIONS

The possibilities of are - plasma spray deposition of polycrystalline ferromagnetic coating are investigated. Powder sintered microwave abso rbing ferrite materials were deposited by are-plasma jet on polycrysta lline substrates. By varying the distance between plasma torch and sub strates and the spray duration, coating; with different thickness and porosity were obtained. The coatings characteristics were studied by o ptical, SEM and XRD methods. The mechanism of the magnetic structure f ormation was controlled by Mossbauer spectroscopy. The microwave absor ption at 9.4 GHz, measured using a standard waveguide equipment was fo und to be 26%.