【作者】 赵宏生； 刘兵； 陈磊； 张凯红； 李自强； 唐春和；

【Author】 ZHAO Hong-sheng,LIU Bing,CHEN Lei, ZHANG Kai-hong,LI Zi-qiang,TANG Chun-he (Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

【机构】 清华大学核能与新能源技术研究院；

【摘要】 高温气冷堆包覆颗粒ZrC涂层的密度是其综合性能的重要体现,直接影响ZrC涂层的高温强度和包覆燃料颗粒的耐辐照性能。本文采用ZrCl₄蒸汽、H₂和C₃H₆作为化学反应体系,在流化床沉积炉中制备出高温气冷堆包覆燃料颗粒ZrC涂层,分别采用X射线照相-图像分析法分析了ZrC涂层的厚度和密度。结果表明,ZrC涂层的沉积速率随着沉积温度的升高而加快,从23.6μm/h提高到29.6μm/h。当沉积温度由1500℃增加到1600℃时,对应的ZrC涂层的密度由5.7g/cm³逐渐增加到5.9g/cm³。当沉积温度由1600℃继续增加到1650℃时,对应的密度又有显著下降,为5.7g/cm³。随着原料气体中C/Zr比由0.5增加到1.25,对应的ZrC涂层的密度由接近理论密度的6.4g/cm³急剧减小到5.3g/cm³,呈单调递减的趋势。更多还原

【Abstract】 The density of ZrC coating deposited on HTR coated fuel particles is one the most important comprehensive performances of coated particle,and it will influence the high temperature strength and irradiation performance directly. In this paper,the ZrC layer of HTR coated particles was deposited in the fluidized bed coating furnace by chemical vapor depositing,using a gas mixture of ZrCl₄ vapor,C₃H₆,H₂ and Ar.The thickness and density of ZrC coating layer was measured by X-ray photography,respectively.The results show that the deposition rate of ZrC coating increased from 23.6μm/h to 29.6μm/h with the deposition temperature increasing,when the deposition temperature increased from 1500℃to 1600℃,the corresponding density of ZrC coatings gradually increased from the 5.7 g/cm³ to 5.9 g/cm³. When the deposition temperature increased from 1600℃to 1650℃,the corresponding density of ZrC coating decreased significantly down to 5.7 g/cm³.As the C/Zr ratio in the feed gas increased from 0.5 to 1.25,the corresponding density of the ZrC coating decreased rapidly from 6.4 g/cm³（close to the theoretical density） to 5.3 g/cm³,showing a monotonic decreasing trend.更多还原