Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of Mono-Disperse Ni Powder for Multilayer Ceramic Capacitor by Solution-Reduction Method

용액환원법에 의한 MLCC용 단분산 니켈 미분말의 합성

  • 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)
  • Published : 2005.10.01
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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

References

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