한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제40권11호
  • /
  • Pages.1067-1072
  • /
  • 2003
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지
DOI QR코드

DOI QR Code

Zn-Pr-Co-Cr-Dy 산화물계 바리스터 세라믹스의 전기적 안정성

Electrical Stability of Zn-Pr-Co-Cr-Dy Oxides-based Varistor Ceramics

  • 남춘우 (동의대학교 전기공학과) ;
  • 박종아 (동의대학교 전기공학과) ;
  • 김명준 (동의대학교 전기공학과) ;
  • 류정선 (동의대학교 전자세라믹스센터)
  • 발행 : 2003.11.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

Zn-Pr-Co-Cr-Dy 산화물계로 구성된 바리스터 세라믹스의 전기적 안정성을 몇 가지 DC 가속열화 스트레스 조건하에서 0.0∼2.0 mol% Dy$_2$O$_3$ 첨가량의 변화에 따라 조사하였다. 바리스터 세라믹스의 밀도는 Dy$_2$O$_3$ 첨가량이 0.5 mol%까지 증가하였으며, 보다 많이 첨가하면 감소하는 것으로 나타났다. 밀도는 전도경로와 밀접한 관계로 인해서 안정성에 큰 영향을 미치는 것으로 나타났다. Dy$_2$O$_3$ 첨가는 바리스터 세라믹스의 비직선 지수를 45 이상, 누설전류를 대략 1.0 $\mu$A 이하로 비직선성을 크게 개선시켰다. DC 스트레스 조건 0.95 V$_{1mA}$/15$0^{\circ}C$/24 h에서 안정성을 조사한 결과, 0.5 mol% 첨가시 상대적으로 가장 높은 안정성을 나타내었다. 전압-전류특성에 있어서 바리스터 전압, 비직선 지수, 누설전류의 변화율은 각각 -0.9%, -14.4%, +483.3%이었으며, 유전특성에 있어서 비유전율 및 손실계수의 변화는 각각 +7.1%, +315.4%이었다. 그 외의 바리스터 세라믹스는 낮은 밀도 때문에 열폭주 현상을 나타내는 매우 불안정한 특성을 나타내었다.다.

The electrical stability of the varistor ceramics composed of Zn-Pr-Co-Cr-Dy oxides-based varistors was investigated at 0.0∼2.0 mol% Dy$_2$O$_3$ content under DC accelerated aging stress. The ceramic density was increased up to 0.5 mol% Dy$_2$O$_3$ whereas further addition of Dy$_2$O$_3$ decreased sintered ceramic density. The density sailently affected the stability due to the variation of conduction path. The nonlinearity of varistor ceramics was greatly improved above 45 in the nonlinear exponent and below nearly 1.0 ${\mu}$A by incorporating Dy$_2$O$_3$. Under 0.95 V$\_$1mA/150$^{\circ}C$/24 h stress state, the varistor ceramics doped with 0.5 mol% Dy$_2$O$_3$ exhibited the highest electrical stability, in which the variation rates of varistor voltage, nonlinear exponent, and leakage current were -0.9%, -14.4%, and +483.3%, respectively. The variation rates of relative permittivity and dissipation factor were +7.1% and +315.4%, respectively. The varistors with further addition of Dy$_2$O$_3$ exhibited very unstable state resulting in the thermal runaway due to low density.

키워드

참고문헌

  1. Am. Ceram. Soc. Bull. v.65 no.4 Zinc Oxide Varistor - a Review L.M.Levinson;H.R.Pilipp
  2. J. Am. Ceram. Soc. v.73 no.7 Applicaton of Zine Oxide Varistor T.K.Gupta https://doi.org/10.1111/j.1151-2916.1990.tb05232.x
  3. J. Am. Ceram. Soc. v.82 no.3 Varistors Ceramics D.R.Clarke https://doi.org/10.1111/j.1151-2916.1999.tb01793.x
  4. J. Am. Ceram. Soc. v.75 no.6 Phase Identification and Electrical Properties in Zno-glass Varistors Y.S.Lee;T.Y.Tseng https://doi.org/10.1111/j.1151-2916.1992.tb04236.x
  5. J. Appl. Phys. v.70 no.11 The Effect of Liquid-Phase Sintering on the Properties of $Pr_{6}O_{11}$-based ZnO Varistors A.B.Alles;L.Burdick https://doi.org/10.1063/1.349812
  6. J. Am. Ceram. Soc. v.76 Compositional Effect on the Liquid-phase Sintering of Praseodymium Oxides-based ZnO Varistors A.B.Alles;R.G.Puskas;Callahan;V.L.Burdick https://doi.org/10.1111/j.1151-2916.1993.tb08338.x
  7. J. Am. Ceram. Soc. v.79 no.9 Microstructure and Crystal Phases of Praseodymium Oxides in Zinc Oxide Varistor Ceramics Y.S.Lee;K.S.Liao;T.Y.Tseng https://doi.org/10.1111/j.1151-2916.1996.tb08986.x
  8. J. Mater. Sci. v.37 no.6 Microstructure and Current-voltage Characteristics of Praseodymium-doped Zinc Oxid Varistor Containing MnO₂, Sb₂O₃ and Co₃O₄ H.H.Hug;K.M.Knowles https://doi.org/10.1023/A:1014359204034
  9. J. Mater. Sci. Lett. v.21 no.3 $ZnO-Pr_{6]O_{11}-CoO-Cr_{2}O_{3}-Er_{2}O_{3}$ Based-ceramic Varistors with High Stability of Nonlinear Properties C.W.Nahm https://doi.org/10.1023/A:1014752523252
  10. J. Mater. Sci. Mater. Electron. v.13 no.2 Effect of Sintering Temperature on Electrical ProPerties and Stability of $Pr_{6}O_{11}$-based ZnO Varistors C.W.Nahm;B.C.Shin https://doi.org/10.1023/A:1013610408895
  11. Mater. Lett. v.57 no.9-10 Influence of Cooling Rate on Stability of Nonlinear Properties of $ZnO-Pr_{6}O_{11}$-based Varistor Ceramics C.W.Nahm;H.S.Kim https://doi.org/10.1016/S0167-577X(02)01020-0
  12. Mater. Lett. v.57 no.7 Highly Stable Electrical Properties of $ZnO-Pr_{6}O_{11}-CoO-Cr_{2}O_{3}-Y_{2}O_{3}$-based Varistor Cearmics C.W.Nahm;B.C.Shin https://doi.org/10.1016/S0167-577X(02)00980-1
  13. Mater. Lett. v.57 no.7 Microstructure and Electrical Properties of Y₂O₃Doped $ZnO-Pr_{6}O_{11}$-based Varistor C.W.Nahm https://doi.org/10.1016/S0167-577X(02)00979-5
  14. Mater. Chem. and Phys. v.80 no.3 Influence of Praseodymium Oxide/Cobalt Oxide Ratio on Electrical Properties of Zine Oxide Varistor Ceramics C.W.Nahm https://doi.org/10.1016/S0254-0584(03)00113-5
  15. J. Am. Ceram. Soc. v.97 no.12 Lineal Intercept Technique for Measuring Grain Size in Two-phase Polyerystalline Ceramics J.C.Wurst;J.A.Nelson
  16. J. Am. Cearm. Soc. v.77 no.10 Deep Level Transient Spectroscopy of Zinc Oxide Varistors Doped with Aluminum Oxide and/of Silver Oxide J.Fan;R.Freer https://doi.org/10.1111/j.1151-2916.1994.tb04659.x