Effect of step sintering on breakdown voltage of varistors prepared from nanomaterials by sol gel route

Surech C. Pillai; J. M. Kelly; D. E. McCormack; R. Ramesh

doi:10.1179/174367606X110189

Effect of step sintering on breakdown voltage of varistors prepared from nanomaterials by sol gel route

Surech C. Pillai^*, J. M. Kelly, D. E. McCormack, R. Ramesh

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm^-1) compared with the commercial samples (723 ±30 V mm^-1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.

Original language	English
Pages (from-to)	158-160
Number of pages	3
Journal	Advances in Applied Ceramics
Volume	105
Issue number	3
DOIs	https://doi.org/10.1179/174367606X110189
Publication status	Published - Jun 2006
Externally published	Yes

Keywords

Dopants
Grain growth
Nano
Sintering
Varistors
ZnO

ASJC Scopus subject areas

Ceramics and Composites
Industrial and Manufacturing Engineering

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10.1179/174367606X110189

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title = "Effect of step sintering on breakdown voltage of varistors prepared from nanomaterials by sol gel route",

abstract = "ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm-1) compared with the commercial samples (723 ±30 V mm-1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.",

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AU - Pillai, Surech C.

AU - Kelly, J. M.

AU - McCormack, D. E.

AU - Ramesh, R.

PY - 2006/6

Y1 - 2006/6

N2 - ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm-1) compared with the commercial samples (723 ±30 V mm-1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.

AB - ZnO varistor materials were prepared by a sol gel route with subsequent drying and calcination. Varistor discs fabricated from these materials were subjected to a two step sintering schedule. Therefore in a typical experiment, the samples were heated to 1000°C, then allowed to cool for over 30 min to 900°C and held there for 6 h. The results were compared with commercial varistor samples sintered in a similar way. Considerably higher breakdown voltages were obtained for the varistors made from nanosample (1192±30 V mm-1) compared with the commercial samples (723 ±30 V mm-1) sintered under the same experimental conditions. The sintered materials were characterised by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and density measurements.

KW - Dopants

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KW - Nano

KW - Sintering

KW - Varistors

KW - ZnO

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Effect of step sintering on breakdown voltage of varistors prepared from nanomaterials by sol gel route

Abstract

Keywords

ASJC Scopus subject areas

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