Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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A Study of pH, Duty Cycle, Agitation on the Property of Co-deposited TiO2 and Thermal Stability in the Electrodeposited Ni-TiO2 Composite

pH, duty cycle, 교반, 첨가제가 Ni-TiO2 전기도금 복합체의 TiO2 공석특성과 열적안정성에 미치는 영향 연구

  • Kim, Myong-Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Joung-Soo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Dong-Jin (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Kim, Hong-Pyo (Nuclear Materials Research Division, Korea Atomic Energy Research Institute) ;
  • Hwang, Seong-Sik (Nuclear Materials Research Division, Korea Atomic Energy Research Institute)
  • 김명진 (한국원자력연구원 원자력재료기술개발부) ;
  • 김정수 (한국원자력연구원 원자력재료기술개발부) ;
  • 김동진 (한국원자력연구원 원자력재료기술개발부) ;
  • 김홍표 (한국원자력연구원 원자력재료기술개발부) ;
  • 황성식 (한국원자력연구원 원자력재료기술개발부)
  • Received : 2012.03.27
  • Accepted : 2012.06.28
  • Published : 2012.06.30
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Abstract

The effects of pH, types of applied current, agitation method and time, additive on the amount of co-deposited $TiO_2$ particles in the matrix were investigated. The deposition rates increased with increasing pH values, while the volume fraction of $TiO_2$ particles and the size of agglomerated $TiO_2$ particles in the composite decreased. The volume fraction of $TiO_2$ particles in the composite decreased when pulsed current of 50% duty cycle was used. And the size of agglomerated $TiO_2$ particles in the nickel matrix of pulsed current was smaller than that of DC current specimen. The volume fraction of $TiO_2$ particles in the matrix decreased with longer time by air agitation, but in case of using magnetic bar, volume fraction in the same range of time was relatively constant. The volume fraction of the electrodeposited Ni-$TiO_2$ composite in the solution containing 0.01 M Dimethylamine borane (DMAB) increased slightly with increasing agitation time regardless of agitation methods. Thermal stability of the electrodeposited Ni-$TiO_2$ composite increased with lower pH at the temperature range of $200{\sim}800^{\circ}C$, and the results showed that the amount of co-deposited $TiO_2$ relies more on the deposition rate than zetapotential of $TiO_2$ particles.

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