Ni（OH）_2水热氢还原制备超细Ni粉  

THE PREPARATION OF ULTRAFINE Ni POWDER FROM Ni(OH)_2 SLURRY BY HYDROTHERMAL REDUCTION WITH HYDROGEN

作　　者：喻克宁[1] 胡嗣强[1] 毛铭华[1] 梁焕珍[1] 陶昌源[1] 康莹[1] 殷澍[1] 

机构地区：[1]中国科学院化工冶金研究所

出　　处：《材料研究学报》1995年第3期223-227,共5页Chinese Journal of Materials Research

基　　金：国家863计划资助

摘　　要：采用ＮｉＳＯ４加过量碱制取的Ｎｉ（ＯＨ）２水浆（ｐＨ１２－１３），经氢还原～３０ｍｉｎ制得平均粒度２０ｎｍ以下的Ｎｉ粉．碱是否过量对Ｎｉ粉粒度影响较大；催化剂和温度对反应速度也有较大影响，氢还原反应机制不是液相中的Ｎｉ离子还原，而是Ｎｉ（ＯＨ）２固体微粒与活性氢之间的反应．The ultrafine Ni powders with an average particle size of less than 20 nm can be prepared by hydrothermal reduction with hydrogen from the Ni(OH)2 slurry which was obtained by mixing the solutions of NiSO4 6H2O with NaOH. The NaOH amount was so adjusted that the pH of reduction end solution was kept above 7. normally 12-13. The basic slurry of Ni(OH)2 was heated. in the presence of PdCl2 as a catalyst. in an autoclave to 160-200 C under H2 martial pressure of 0.9-3 MPa for about 30 min. Ni powwder was obtained and the yield was virtually 100%. The particle size of Ni powder mainly depends on the amount of NaOH. Temperature and the amount of PdCl2 show obvious effects on the reaction rate. The roposed reaction mechanism is not based on the reduction of Ni(2-) ions in the liquid phase. but on the reaction between the solid particles of Ni(OH)2 and the activated hydrogen.

关 键 词：氢氧化镍 水热还原 纳米级 镍粉 氢还原 

分 类 号：TF123.23[冶金工程—粉末冶金]