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http://dx.doi.org/10.4191/KCERS.2005.42.10.649

Preparation of Mono-Disperse Ni Powder for Multilayer Ceramic Capacitor by Solution-Reduction Method  

Kim, Kang-Min (Department of Materials Science and Engineering, Korea University)
Lee, Jong-Heun (Department of Materials Science and Engineering, Korea University)
Yoon, Seon-Mi (Materials and Devices Laboratory, Samsung Advanced Institute of Technology)
Lee, Yong-Kyun (Materials and Devices Laboratory, Samsung Advanced Institute of Technology)
Lee, Hyun-Chul (Materials and Devices Laboratory, Samsung Advanced Institute of Technology)
Choi, Jae-Young (Materials and Devices Laboratory, Samsung Advanced Institute of Technology)
Publication Information
Journal of the Korean Ceramic Society / v.42, no.10, 2005 , pp. 649-653 More about this Journal
Abstract
A mono-disperse Ni powders for multilayer ceramic capacitors were prepared in a large scale by solution reduction method using $NiSO_{4}$ $N_{2}$$H_{4}$and NaOH. The exothermic reactions such as Ni-complex formation between highly concentrated $NiSO_{4}$ and $N_{2}$$H_{4}$ and the reduction of $Ni^{2+}$ into Ni provided thermal energy sufficient for spontaneous solution-reduction reaction. Because well-defined Ni particles could be prepared without external heating, the present method was named as 'auto-thermal method'. The formation of Ni­complex, the precipitation of $Ni(OH)_{2}$ gel triggered by NaOH addition, and its reduction into Ni by dissolution-recrystallization route were the reaction mechanism. The preparation of mono-disperse and spherical Ni powder was attributed to uniform distribution of reducing agent $N_{2}$$H_{2}$ within $Ni(OH)_{2}$ gel due to the decomposition of$NiSO_{4}$-$N_{2}$ $H_{4}$ complex.
Keywords
Ni powder; Exothermic reduction; Ni-Complex; Mono-disperse powder; Solution reduction;
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