期刊
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
卷 46, 期 6, 页码 732-736出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/1743278210Y.0000000023
关键词
Iridium coating; Molybdenum; Flame ablation
资金
- National Natural Science Foundation of China [50872055/E020703]
- State Key Laboratory of Solidification Processing in Northwestern Polytechnical University [SKLSP200907]
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 800-850 degrees C at 35 Pa. During deposition, the Mo substrate was biased at a voltage of -300 V while the 99.9% Ir target was at a bias voltage of -800 V. After deposition, the Ir coating was ablated using an oxyacetylene torch with a flame temperature of similar to 2000 degrees C 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(-2) s(-1).
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