Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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The Electrical Behavior of Plasma Sprayed Al2O3-TiO2 Coatings

플라즈마 용사된 Al2O3-TiO2 코팅의 전기적 특성

  • Park, Sang-Jun (Engineering Ceramics Center, Korea Institute of Ceramic Technology and Engineering) ;
  • Lee, Sung-Min (Engineering Ceramics Center, Korea Institute of Ceramic Technology and Engineering)
  • 박상준 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 이성민 (한국세라믹기술원 엔지니어링세라믹센터)
  • Received : 2017.10.20
  • Accepted : 2017.10.31
  • Published : 2017.12.01
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Abstract

Electrical behaviors of plasma-sprayed $Al_2O_3-TiO_2$ coatings have been investigated in terms of their $TiO_2$ content. On increasing the $TiO_2$ content from 6 to 30 wt%, the DC electrical conductivity increased by several orders of magnitude. From impedance spectroscopy analysis, the total conductivity of the grains and grain boundaries and their respective activation energies were determined without the electrode effects that could impede ionic transfer. An electron transference number was also estimated, ranging between 6.5% and 7.3% for 13 wt% $TiO_2$ and between 0.4% and 0.7% for 30 wt% $TiO_2$ in the coating. Because of the high electronic contribution to the total conductivity, the $Al_2O_3-TiO_2$ coating could be a new candidate material to obtain superior electrical conductivity as well as corrosion and wear resistances.

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