摘要
The main technical problems of nickel powder for multiplayer ceramic capacitors are particle size controlling, the agglomeration and tap density. Ultrafine nickel powders with submicron size and spherical shape were synthesized by the hydrazine reduction of nickel sulfate in ethanol-water solvent. The effects of reaction temperature, nucleator and flow rate of nickel sulfate solution on nickel powders properties were investigated. The nickel particles synthesized were characterized by SEM and TGA. The results show that the average particle size changes from 0.1 to 0.7 μm by adjusting reaction temperature (53- 73 ℃) and flow rate of nickel sulfate solution (50- 100 mL/min). Moreover, temperature below 60 ℃ and appropriate flow rate of nickel sulfate solution (85 mL/min) are in favor of obtaining particles with high tap density (>3.0 g/cm3). In addition, the introduction of nucleator is useful to obtaining particles with narrow size distribution.
The main technical problems of nickel powder for multiplayer ceramic capacitors are particle size controlling, the agglomeration and tap density. Ultrafine nickel powders with submicron size and spherical shape were synthesized by the hydrazine reduction of nickel sulfate in ethanol-water solvent. The effects of reaction temperature, nucleator and flow rate of nickel sulfate solution on nickel powders properties were investigated. The nickel particles synthesized were characterized by SEM and TGA. The results show that the average particle size changes from 0.1 to 0.7 μm by adjusting reaction temperature （53-73℃） and flow rate of nickel sulfate solution （50-100 mL/min）. Moreover, temperature below 60 ℃ and appropriate flow rate of nickel sulfate solution （85 mL/min） are in favor of obtaining particles with high tap density （〉3.0 g/cm^3）. In addition, the introduction of nucleator is useful to obtaining particles with narrow size distribution.
出处
《中国有色金属学会会刊：英文版》
EI
CSCD
2006年第5期1223-1227,共5页
Transactions of Nonferrous Metals Society of China
基金
Project(50474047) supported by the National Natural Science Foundation of China
关键词
镍
超细粉未
化学还原
振实密度
陶瓷电容器
ultrafine nickel powder
chemical reduction
tap density
multiplayer ceramic capacitor
