PROCESSING AND CHARACTERIZATION OF LOW-VOLTAGE VARISTORS

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dc.contributor.authorCerri, J. A.
dc.contributor.authorSteil, M. C.
dc.contributor.authorLongo, Elson [UNESP]
dc.contributor.authorVarela, José Arana [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:23:43Z
dc.date.available2014-05-20T15:23:43Z
dc.date.issued1994-05-01
dc.description.abstractZnO seed particles and Cr2O3 were used in this study to control the microstructure of ZnO varistors. The seed particles were prepared by adding 1.0 mol % BaO to ZnO. The powder was then calcined at 800-degrees-C for 2 h, pressed into pellets and sintered at 1400-degrees-C for 8 h. The sintered ZnO was ground and the BaO eliminated by washing in water. The remaining ZnO powder was classified into a size fraction ranging from 38 to 149 mum. The addition of a small amount (1 weight %) ZnO seed grains produces varistors with low breakdown voltages (7.6 V/mm) and an alpha coefficient of approximately 10. The addition of Cr2O3 stabilizes the spinel phase yielding a more homogeneous microstructure, but degraded electrical behaviour of the ZnO varistor.en
dc.description.affiliationUNESP,INST QUIM,BR-14800 ARARAQUARA,SP,BRAZIL
dc.description.affiliationUnespUNESP,INST QUIM,BR-14800 ARARAQUARA,SP,BRAZIL
dc.format.extent214-216
dc.identifier.citationSilicates Industriels. Mons: Belgian Ceramic Society, v. 59, n. 5-6, p. 214-216, 1994.
dc.identifier.issn0037-5225
dc.identifier.urihttp://hdl.handle.net/11449/34439
dc.identifier.wosWOS:A1994QE63800011
dc.language.isoeng
dc.publisherBelgian Ceramic Society
dc.relation.ispartofSilicates Industriels
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titlePROCESSING AND CHARACTERIZATION OF LOW-VOLTAGE VARISTORSen
dc.typeArtigo
dcterms.rightsHolderBelgian Ceramic Society
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt

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