Effect of cooling rate on degradation characteristics of ZnO•Pr6O11•CoO•Cr2O3•Y2O3-based varistors

被引：7

作者：

Nahm, CW ^{[1
]}

机构：

[1] Univ Dongeui, Dept Elect Engn, Pusan 614714, South Korea

来源：

SOLID STATE COMMUNICATIONS | 2004年 / 132卷 / 3-4期

关键词：

ceramics; varistors; electrical properties; degradation; cooling rate;

D O I：

10.1016/j.ssc.2004.07.040

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The effect of cooling rate on microstructure, V-I characteristics, dielectric characteristics, and their degradation characteristics against DC stress of varistors composing of (ZnOPr6O11CoOCr2O3Y2O3)-Pr-.-Co-.-Cr-.-Y-.-based ceramics was investigated in the range of 2-8 degreesC/min. The cooling rate affected the electrical properties, whereas particularly DC degradation characteristics. The highest nonlinearity, with nonlinear exponent of 56.8 and leakage current of 1.6 muA was obtained from a cooling rate of 2 degreesC/min. However, the best degradation characteristics were obtained at a cooling rate of 4 degreesC/min. The stability against DC stress with cooling rate was found to be increased gradually in order of 8 --> 2 --> 6 --> 4 degreesC/min in cooling rate. As a result, the degradation characteristics of varistors can be improved by changing the cooling rate. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：213 / 218

页数：6

共 21 条

[1] A GRAIN-BOUNDARY DEFECT MODEL FOR INSTABILITY STABILITY OF A ZNO VARISTOR [J].

GUPTA, TK ;

CARLSON, WG .

JOURNAL OF MATERIALS SCIENCE, 1985, 20 (10) :3487-3500

[2] APPLICATION OF ZINC-OXIDE VARISTORS [J].

GUPTA, TK .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1990, 73 (07) :1817-1840

[3] PHASE IDENTIFICATION AND ELECTRICAL-PROPERTIES IN ZNO-GLASS VARISTORS [J].

LEE, YS ;

TSENG, TY .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1992, 75 (06) :1636-1640

[4]

LEVINSON LM, 1986, AM CERAM SOC BULL, V65, P639

[5] Effect of sintering time on electrical properties and stability against DC accelerated aging of Y2O3-doped ZnO-Pr6O11-based varistor ceramics [J].

Nahm, CW ;

Shin, BC .

CERAMICS INTERNATIONAL, 2004, 30 (01) :9-15

[6] Microstructure and electrical properties of ZnO-Pr6O11-CoO-Cr2O3-Dy2O3-based varistor ceramics [J].

Nahm, CW ;

Park, JA ;

Kim, MJ .

JOURNAL OF MATERIALS SCIENCE, 2004, 39 (01) :307-309

[7] Microstructure and electrical propertiesOf Y2O3-doped ZnO-Pr6O11-based varistor ceramics [J].

Nahm, CW ;

Shin, BC ;

Min, BH .

MATERIALS CHEMISTRY AND PHYSICS, 2003, 82 (01) :157-164

[8] Nonlinear electrical properties and DC accelerated aging characteristics of ZnO-Pr6O11-CoO-Cr2O3-Dy2O3-based varistors [J].

Nahm, CW .

SOLID STATE COMMUNICATIONS, 2003, 127 (05) :389-393

[9] Nonlinear properties and stability against DC accelerated aging stress of praseodymium oxide-based ZnO varistors by Er2O3 doping [J].

Nahm, CW .

SOLID STATE COMMUNICATIONS, 2003, 126 (05) :281-284

[10] Highly stable nonlinear properties of ZnO-Pr6O11-CoO-Cr2O3-Y2O3-based varistor ceramics [J].

Nahm, CW ;

Shin, BC .

MATERIALS LETTERS, 2003, 57 (07) :1322-1326

← 1 2 3 →