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首页> 外文期刊>Journal of Materials Engineering and Performance >Characterisation of Ceramic-Coated 316LN Stainless Steel Exposed to High-Temperature Thermite Melt and Molten Sodium
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Characterisation of Ceramic-Coated 316LN Stainless Steel Exposed to High-Temperature Thermite Melt and Molten Sodium

机译：陶瓷涂层316LN不锈钢的特征暴露于高温热轧酯和熔融钠

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摘要

Currently, stainless steel grade 316LN is the material of construction widely used for core catcher of sodium-cooled fast reactors. Design philosophy for core catcher demands its capability to withstand corium loading from whole core melt accidents. Towards this, two ceramic coatings were investigated for its application as a layer of sacrificial material on the top of core catcher to enhance its capability. Plasma-sprayed thermal barrier layer of alumina and partially stabilised zirconia (PSZ) with an intermediate bond coat of NiCrAlY are selected as candidate material and deposited over 316LN SS substrates and were tested for their suitability as thermal barrier layer for core catcher. Coated specimens were exposed to high-temperature thermite melt to simulate impingement of molten corium. Sodium compatibility of alumina and PSZ coatings were also investigated by exposing samples to molten sodium at 400 degrees C for 500 h. The surface morphology of high-temperature thermite melt-exposed samples and sodium-exposed samples was examined using scanning electron microscope. Phase identification of the exposed samples was carried out by x-ray diffraction technique. Observation from sodium exposure tests indicated that alumina coating offers better protection compared to PSZ coating. However, PSZ coating provided better protection against high-temperature melt exposure, as confirmed during thermite melt exposure test.
机译：目前，不锈钢级316LN是施工材料广泛用于钠冷却快速反应器的核心捕手。核心捕手的设计理念要求其能力从整个核心熔体事故中承受核心载荷。向此迈出，研究了两个陶瓷涂层，以将其应用作为核心捕集器顶部的牺牲材料层，以提高其能力。选择氧化铝和部分稳定的氧化锆（PSZ）的等离子体喷涂的热阻挡层，其具有中间键粘土涂层作为候选材料并沉积超过316Ln的底物，并以芯捕机的热阻挡层测试它们的适用性。将涂层标本暴露于高温热轧酯熔体，以模拟熔融脊髓的冲击。还通过将样品暴露于400℃的熔融钠将样品暴露于400℃，对氧化铝和PSZ涂层的钠相容性进行研究。使用扫描电子显微镜检查高温热轧膜暴露的样品和钠暴露样品的表面形态。通过X射线衍射技术进行暴露样品的相位鉴定。与PSZ涂层相比，钠曝光试验的观察表明氧化铝涂层提供更好的保护。然而，PSZ涂层提供了更好地保护高温熔体暴露，如热熔熔曝光试验所确认的。

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