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ZHENG Zhan-shen, QU Yuanfang, LI Xiao-lei, et al. Effects of metal contents ( Ni| Mn) and processing on PTCR ceramic properties[J]. Acta Materiae Compositae Sinica, 2006, 23(5): 39-43.
Citation: ZHENG Zhan-shen, QU Yuanfang, LI Xiao-lei, et al. Effects of metal contents ( Ni| Mn) and processing on PTCR ceramic properties[J]. Acta Materiae Compositae Sinica, 2006, 23(5): 39-43.
shu

Effects of metal contents ( Ni| Mn) and processing on PTCR ceramic properties

  • 1.

    School of Materials Science and Engineering| Tianjin University| Tianjin 300072| China ;

  • 2.

    School of Materials Science and Engineering| Hebei Polytechnic University| Tangshan 063009| China

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  • Received Date: October 30, 2005
  • Revised Date: January 08, 2006
    Abstract
  • In order to obtain a low resistivity and high PTC effect , the Ni/ Mn/ BaTiO3 composite was prepared bythe t raditional solid-crystal sintering method. The effect s of metal content s (Ni , Mn) and heat t reatment techniqueson positive temperature coefficient resistor ( PTCR) ceramic properties were studied. The very weak PTC effect ofthe composite sintered in deoxidizing atmosphere (1250 ℃, 20 min) was renewed effectively by heat-t reatment in air(780 ℃, 60 min) . The Ni/ Mn/ BaTiO3 composite has the low room-temperature resistivity (ρ25 ℃ = 10. 2Ω·cm) andan obvious PTC effect (ρmax /ρmin = 1. 42 ×103 ) .
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