한국재료학회지 (Korean Journal of Materials Research)

  • 제15권11호
  • /
  • Pages.722-729
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  • 2005
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  • 1225-0562(pISSN)
  • /
  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
권호 표지
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코발트 산화물 첨가가 산화아연 바리스터의 전기적, 유전적 안정성에 미치는 영향

The Effect of Cobalt Oxide Addition on Electrical and Dielectic Stability of Zinc Oxide Varistors

  • 남춘우 (동의대학교 전기공학과) ;
  • 유대훈 (동의대학교 전기공학과)
  • Nahm Choon-Woo (Department of Electrical Engineering, Dongeui University) ;
  • Yoo Dae-Hoon (Department of Electrical Engineering, Dongeui University)
  • 발행 : 2005.11.01
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초록

The electrical and dielectric stability of zinc oxide-based varistors were investigated with the cobalt oxide contents in the range of $0.5\~5.0 mo\l%$. As cobalt oxide contents increased, the ceramic density increased in the range of $5.25\~5.55g/cm^3$ and the varistor voltage decreased in the range of $235.3\~86.0V$. The varistor with on addition of cobalt oxide $1.0 mol\%$ exhibited good nonlinearity. in which the nonlinear exponent is 66.6 and the leakage current is $1.2{\mu}A$. Furthermore, the varistors exhibited the highest electrical and dielectric stability, with $\%{\Delta}V_{1mA}=-1.9\%,\;\%{\Delta}{\alpha}=-10.5\%,\;\%{\Delta}I_L=+275.0\%,\;and\;\%{\Delta}tna{\delta}=+55.6\%$, under DC accelerated aging $0.95V_{1mA}/150^{\circ}C/24h$.

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참고문헌

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