摘要
采用微弧氧化技术在ZrH_(1.8)表面制备阻氢膜层,研究在Na_(5)P_(3)O_(10)-NaOH-Na_(2)EDTA电解液体系中K_(2)ZrF_(6)含量对膜层组织结构和阻氢性能的影响。借助场发射扫描电子显微镜(FESEM)和X射线衍射仪(XRD)分析膜层的微观结构和物相组成。采用涂层测厚仪对膜层的厚度进行测量,通过真空脱氢实验表征膜层的阻氢性能。相比未加入K_(2)ZrF_(6)时,电解液中添加适量K_(2)ZrF_(6)有助于改善膜层的表面质量,减少膜层中微孔和裂纹等缺陷的出现。XRD分析表明,不同K_(2)ZrF_(6)浓度时ZrH_(1.8)表面微弧氧化制备的膜层均主要由m-ZrO_(2),t-ZrO_(2)和少量c-ZrO_(2)相组成。膜层厚度和氢渗透降低因子(PRF)随K_(2)ZrF_(6)浓度的增加均呈先增大后减小趋势,当K_(2)ZrF_(6)为4g·L^(-1)时,膜层的厚度最大为68.7μm,PRF最大为13.1,且膜层中大尺寸缺陷较少,添加K_(2)ZrF_(6)制备的陶瓷膜的阻氢性能均得到提高。K_(2)ZrF_(6)添加剂的加入可以使ZrH_(1.8)表面微弧氧化膜层的厚度增大,致密性增强,进而阻氢性能提高,膜层表面质量也得到改善。
Zirconium hydride was regarded as an ideal solid neutron moderator and shielding material for space nuclear reactors.The high temperature hydrogen loss phenomenon of zirconium hydride was a problem that researchers had been paying attention to.Using micro-arc oxidation technology to prepare a hydrogen resistance film on the surface of zirconium hydride could effectively slow down the hydrogen precipitation.Studies had shown that the type and content of additives in the micro-arc oxidation electrolyte would affect the structure and performance of the hydrogen barrier film on the surface of zirconium hydride.The hydrogen barrier film was prepared on the surface of ZrH_(1.8)by micro-arc oxidation technique.The experiment process mainly included pretreatment of the sample such as cutting,grinding,degreasing,electrolyte preparation and micro-arc oxidation treatment.The effect of K2Zr F6content on the microstructure and properties of the film in Na_(5)P_(3)O_(10)-NaOH-Na_(2)EDTA electrolyte system was studied.The microstructure and phase composition of the film were analyzed by field emission scanning electron microscopy(FESEM)and X-ray diffraction(XRD).The thickness of the film was measured by a coating thickness gauge,and the hydrogen barrier performance of the film was characterized by vacuum dehydrogenation experiments.When K_(2)ZrF_(6) was not added to the electrolyte,there were large pores on the surface of the micro-arc oxidation film on the surface of ZrH_(1.8),and many cracks were distributed discretely.Compared with the absence of K2Zr F6,the addition of an appropriate amount of K_(2)ZrF_(6) helped to improve the surface quality of the film and reduce the occurrence of defects such as micropores and cracks in the film.With the increase of the concentration of K_(2)ZrF_(6) in the electrolyte(<4 g·L^(-1)),the number of micropores on the surface of the film increased,the size of the micropores decreased significantly,and the number of cracks decreased.The surface of the film gradually became flat.When the K_(2)
作者
杜培
闫淑芳
陈伟东
李世江
杨少辉
Du Pei;Yan Shufang;Chen Weidong;Li Shijiang;Yang Shaohui(College of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of Thin Film and Coatings Technology y Hohhot 010051,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2021年第1期27-33,共7页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51964035,51364026)资助。
关键词
ZrH_(1.8)
微弧氧化
阻氢膜层
氟锆酸钾
ZrH_(1.8)
micro-arc oxidation(MAO)
hydrogen barrier film
potassium fluorozirconate
