球形Ni(OH)_2控制结晶过程中的陈化研究  

Study on Aging during Controlled Crystallization Processes of Spherical Ni(OH)_2

作　　者：彭美勋[1] 沈湘黔[2] 危亚辉[2] 

机构地区：[1]湖南科技大学化学化工学院,湘潭411201 [2]长沙矿冶研究院

出　　处：《材料导报》2007年第11期121-124,共4页Materials Reports

基　　金：国家自然科学基金重点项目(50134020)资助

摘　　要：利用控制结晶方法在连续搅拌反应器中制备了球形氢氧化镍,通过电子显微技术表征了球形氢氧化镍的内外结构并研究了其生长过程中的陈化现象。随着反应物过饱和度的下降,反应器内部按功能不同可分成成核区、生长区与熟化区等。在球形氢氧化镍控制结晶生长过程中存在Ostwald熟化,它在粒子之间及粒子表面发生;同时亦存在晶相转变α→β,表现为重结晶作用,在团聚粒子内部进行。Ostwald熟化与相转变构成的陈化作用在促使氢氧化镍粒子团聚密实、重结晶长大、形态向球形转变并使其表面光滑和内部结构呈放射状等微结构的形成过程中发挥重要作用。这一认识深化了球形工业结晶研究,并对反应器设计具有指导意义。The spherical Ni（OH）2 is synthesized with controlled crystallization method in a continuous stirring tank reactor. The outer and interior structures of spherical Ni（OH）2 particles are characterized with electronic microscopy technologies and the aging phenomena during growth processes are discussed. According to the decrease of the degree of the reactants supersaturation, the reactor can be divided into three functional scales of nucleation scale, growth scale and ripening scale. Ostwald ripening course exists during the crystallization growth processes and occurs on the surfaces of the particles and between the particles, and crystal phase transition α→β exists inside the particles accompanied with recrystallization. The ageing actions including Ostwald ripening and crystal phase transition play important roles in the formation of the microstructures of spherical Ni（OH）2 particles and lead to the compact spherical particles with smooth surface and radial interior microstruetures. This recognition deepens the understanding of spherical indus- try crystallization and directs the reactor design.

关 键 词：球形氧氧化镍 反应结晶 Ostwald熟化 晶相转变 陈化 

分 类 号：TM911[电气工程—电力电子与电力传动]