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首页> 外文期刊>Corrosion Engineering, Science and Technology >Oxidation of double glow plasma discharge coatings of iridium on molybdenum for liquid fuelled rocket motor casings
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Oxidation of double glow plasma discharge coatings of iridium on molybdenum for liquid fuelled rocket motor casings

机译：液体燃料火箭发动机壳体上钼的铱的双辉光等离子体放电涂层的氧化

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摘要

Dense and uniform coatings of iridium (Ir), 5-7 μm in thickness, were deposited onto molybdenum (Mo) substrates by double glow plasma discharge in the temperature range of 800-850℃ 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 ～2000℃ 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).
机译：通过在35 Pa的温度范围内在800-850℃的温度下通过双辉等离子体放电将厚度为5-7μm的致密且均匀的铱（Ir）涂层沉积到钼（Mo）衬底上。在-300 V的电压下偏置，而99.9％的Ir目标在-800 V的偏置电压下。沉积后，使用火焰温度为〜2000℃的乙炔炬烧蚀Ir涂层，以确定高温稳定性涂层基材的厚度。用扫描电子显微镜观察Ir涂层的形貌和微观结构，同时用X射线衍射和能量色散光谱法测量其组成和结构。所沉积的Ir涂层的厚度是均匀的，并且涂层与基材之间的界面表现出优异的粘附性，没有分层和裂纹的迹象。暴露在火焰中后，烧蚀涂层的表面出现瑕疵，包括气孔，凸起和裂纹。然而，Ir涂层保留了足够的附着力，以将Ir涂层的Mo基材的重量损失限制在10 mg cm〜（-2）s〜（-1）。

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