流化床-化学气相沉积法制备金属涂层包覆燃料颗粒  

Preparation of metal coated fuel particles using the fluidized bed-chemical vapor deposition method

作　　者：杨旭 程心雨 刘荣正[1] 刘兵[1] 邵友林[1] 刘马林[1] YANG Xu;CHENG Xinyu;LIU Rongzheng;LIU Bing;SHAO Youlin;LIU Malin(Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学核能与新能源技术研究院,北京100084

出　　处：《清华大学学报（自然科学版）》2021年第4期361-366,共6页Journal of Tsinghua University(Science and Technology)

基　　金：国家科技重大专项资助项目(2017ZX06901025)。

摘　　要：含有Nb、Zr、W等金属包覆层的包覆型燃料颗粒是一种新型的燃料元件形式,在核工业中有重要应用。该文利用流化床-化学气相沉积(FB-CVD)法,制备得到了含有金属包覆层的新型包覆颗粒,研究了热态输运与冷态输运2种方式对金属卤化物前驱体的载带,最终成功制备得到了纯相金属Nb与金属Zr包覆层。实验结果表明,金属包覆层可有效提升包覆颗粒整体的力学性能。该文还研究了沉积温度、前驱体输运、包覆层氧化等不同因素对沉积速率的影响。结果表明: CVD制备的金属包覆层可有效提升包覆颗粒整体的压碎强度,但抗氧化性较差,不适用于直接在氧化环境下制备与使用,可作为包覆颗粒的中间涂层。Fuel particles are coated with metals such as Nb,Zr,or W for advanced nuclear industry fuels.Coated particles with Nb and Zr coatings were fabricated using fluidized bed-chemical vapor deposition(FB-CVD)with investigations of the thermal transport characteristics of the precursors.The results showed that the metal coating improves the mechanical properties of the coated particles.The investigation studied the effects of the deposition temperature,precursor transport and oxidation on the metal deposition rate.The metal coating layer enhances the crushing strength,but has poor oxidation resistance,so it cannot be used in an oxidizing environment.

关 键 词：包覆颗粒 流化床-化学气相沉积(FB-CVD) 铌涂层 锆涂层 

分 类 号：TL344[核科学技术—核技术及应用]