Dense and uniform coatings of iridium (Ir), 5-7 mm in thickness, were deposited onto molybdenum (Mo) substrates by double glow plasma discharge in the temperature range of 800-850uC at 35 Pa. During deposition, the Mo substrate was biased at a voltage of 2300 V while the 99?9% Ir target was at a bias voltage of 2800 V. After deposition, the Ir coating was ablated using an oxyacetylene torch with a flame temperature of y2000uC to determine the high temperature stability of the coated substrate. The morphology and microstructure of the Ir coating were observed using scanning electron microscopy while the composition and structure were measured using X-ray diffraction and energy dispersive spectroscopy. The thickness of the as deposited Ir coating was uniform and the interface between the coating and the substrate exhibited excellent adhesion with no evidence of delamination and cracks. After exposure to the flame, the surface of the as ablated coating presented imperfections including pores, bulges and cracks; however, the Ir coating retained sufficient adhesion to limit the weight loss of the Ir coated Mo substrate to 10 mg cm 22 s 21 .
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.