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简介:改善高温气冷用石墨抗氧化性能对高温气冷堆安全性具有重要意义。本文利用HSC—CHEMISTRY4.1计算软件分析了SiC涂层、SiO2涂层和SiC/SiO2复合涂层在高温气冷堆正常服役条件和事故条件下的热稳定性,并用氧化试验对热稳定性和抗氧化性能进行了研究。结果表明,SiC/SiO2复合涂层在高温气冷堆正常服役条件和事故条件均能保持长期稳定。在纯氮气及氮气-空气混合气体氧化条件下,SiC/SiO2复合涂层均具有很好的热稳定性,并且能显著改善高温气冷堆用石墨的抗氧化性能。