球形氧化锆及氧化锆/镍复合粉体的制备  

Preparation of spherical zirconia and Ni-coated zirconia composite powders

作　　者：赵清杰[1] 陈启元[1] 

机构地区：[1]中南大学化学化工学院

出　　处：《中国有色金属学报》2006年第7期1269-1275,共7页The Chinese Journal of Nonferrous Metals

摘　　要：采用化学沉淀法分别制备球形氧化锆及镍/氧化锆复合微球粉体。考察加料速度、加料方式和反应器结构等因素对粒径分布、结晶状态及形貌的影响,初步得到优化工艺条件,并在优化条件下制得粒径分布均匀的球形氧化锆粉体和镍包裹氧化锆复合粉体。利用扫描电镜、能谱及X射线衍射仪分别对前驱体及热处理产物的形貌和物相进行分析,利用激光粒度分析仪检测球形氧化锆前驱体的粒径分布。研究表明,采用化学沉淀法,通过优化制备工艺条件,可以制备粒径分布较均匀的球形氧化锆粉体;利用非均相化学沉淀包裹技术制备的金属镍包裹氧化锆微球粉体,球形氧化锆颗粒表面作为异相成核的场所,通过控制颗粒浓度、加料速度以及添加表面活性剂等工艺条件,可以调控包裹层厚度、表面均匀度以及表面裂纹等。The spherical zirconia and Ni-coated zirconia composite powders were synthesized by the chemical precipitation method. The processing factors, such as adding rate and manner of reactants feeding, the structure of the reactor on the particle size distribution, particle growth and morphologies were analyzed. The spherical zirconia and nickel coated zirconia powders with a suitable particle size distrihution were prepared at the optimized conditions. The morphology and structure of Zr（OH）4, NiCO3· 2Ni（OH）2· 2H2O-coated precursors and resultant powders derived from calcination of these precursors were characterized by SEM, EDS and XRD. The particles size distribution of zirconia precursors were measured by laser particle analyzer. The results show that, by the way of optimizing preparation condition, the spherical zirconia powders with suitable particle size distribution are prepared using chemical precipitation method. Using heterogeneous chemical precipitation coating technique, the spherical nickel coated zirconia powders are prepared and the heterogeneous nucleation can be done on the surface of spherical zirconia powders. The thickness of coated layer, homogeneous degree and crack of surface can be controlled by the way of controlling powder concentration, adding rate of reactants feeding and adding surface active agent.

关 键 词：球形氧化锆 镍/氧化锆复合粉 化学沉淀法 

分 类 号：TB333[一般工业技术—材料科学与工程]