(1. 中南大學 化學化工學院， 長沙 410083；
2. 中國鋁業(yè)股份有限公司 鄭州研究院， 鄭州 450041)
摘 要: 采用化學沉淀法分別制備球形氧化鋯及鎳/氧化鋯復合微球粉體。 考察加料速度、 加料方式和反應器結構等因素對粒徑分布、 結晶狀態(tài)及形貌的影響， 初步得到優(yōu)化工藝條件， 并在優(yōu)化條件下制得粒徑分布均勻的球形氧化鋯粉體和鎳包裹氧化鋯復合粉體。 利用掃描電鏡、 能譜及X射線衍射儀分別對前驅體及熱處理產物的形貌和物相進行分析, 利用激光粒度分析儀檢測球形氧化鋯前驅體的粒徑分布。 研究表明， 采用化學沉淀法， 通過優(yōu)化制備工藝條件， 可以制備粒徑分布較均勻的球形氧化鋯粉體； 利用非均相化學沉淀包裹技術制備的金屬鎳包裹氧化鋯微球粉體， 球形氧化鋯顆粒表面作為異相成核的場所， 通過控制顆粒濃度、 加料速度以及添加表面活性劑等工藝條件， 可以調控包裹層厚度、 表面均勻度以及表面裂紋等。
關鍵字: 球形氧化鋯； 鎳/氧化鋯復合粉； 化學沉淀法
（1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. Zhengzhou Research Institute of CHALCO, Zhengzhou 450041, China）
Abstract: 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 distribution 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 sph, erical 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.
Key words: spherical zirconia; Ni-coated zirconia composite powders; chemical precipitation method
