摘要
采用水热法在Ni颗粒表面制备了Ni(OH)2包覆层,并在惰性气氛(Ar)下退火获得了具有包覆结构的Ni-NiO粉体复合材料。研究了尿素浓度、反应温度和反应时间对包覆结构粉体复合材料物相组成与微观形貌的影响。结果表明:随着尿素浓度的升高,Ni颗粒表面形成的Ni(OH)2包覆层由初始的片状和颗粒状的混合结构逐渐转变为单一的片状结构,最终仅表现为颗粒状结构ꎻ随着反应温度上升,包覆层尺寸逐渐增大ꎻ延长反应时间不仅增加了包覆层尺寸,还显著增强了其厚度。在尿素浓度03 mol/L、反应温度150℃、反应时间12 h的条件下,Ni颗粒表面可均匀地形成片状Ni(OH)2包覆层。此外,退火处理并未改变Ni-NiO粉体复合材料的微观形貌。本研究可为制备具有包覆结构的粉体复合材料提供理论与实践基础。
A Ni(OH)2 coating layer was prepared on the surface of Ni particles using the hydro-thermal method,and Ni-NiO powder composites with a coated structure were obtained by annealing under an inert atmosphere(Ar).The effects of urea concentration,reaction temperature,and reac-tion time on the phase composition and microstructure of the coated powder composites were inves-tigated.The results showed that as the urea concentration increased,the Ni(OH)2 coating layer on the surface of the Ni particles gradually transformed from an initial mixed structure of flakes and granules into a pure flake structure,and eventually into a granular structure.With the increase in re-action temperature,the size of the coating layer increased progressively.Moreover,extending the re-action time not only enlarged the size of the coating layer but also significantly enhanced its thick-ness.Under the conditions of a urea concentration of 03 mol/L,a reaction temperature of 150℃,and a reaction time of 12 hours,a uniform flake-like Ni(OH)2 coating layer was formed on the sur-face of Ni particles.Additionally,the annealing process did not alter the microstructure of the Ni-NiO powder composite.This study provides both theoretical and practical foundations for the prepa-ration of coated powder composites.
作者
陈永志
李佐红
罗佳
高凯
张晓红
余勇
王利华
周宏志
CHEN Yongzhi;LI Zuohong;LUO Jia;GAO Kai;ZHANG Xiaohong;YU Yong;WANG Lihua;ZHOU Hongzhi(Hunan Institute of Science and Technology,Yueyang 414000,China;Xi'an Jiaotong University,Xi'an 710049,China;China Machinery International Engineering Design&Research Institute Co.,Ltd.,Changsha 41000,China;Hunan Yingjie High-Tech Co.,Ltd.,Changsha 410000,China)
出处
《沈阳理工大学学报》
2025年第3期73-80,共8页
Journal of Shenyang Ligong University
基金
国家自然科学基金项目(52205054)
湖南省普通高等学校科技创新团队支持项目。
