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| Preparation and properties of the Ni/PTC ceramic composite |
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| 天津大学材料学院 |
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Cite this article:
;. Preparation and properties of the Ni/PTC ceramic composite. Chin J Mater Res, 2004, 18(6): 654-660.
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Abstract In order to decrease the room-temperature resistivity of PTC materials,
Ni/BaTiO$_{3}$ composite was synthesized by decomposition of
NiC$_{2}$O$_{4}\cdot$2H$_{2}$O/BaTiO$_{3}$ precursor, which was prepared
by precipitating nickel oxalate into BaTiO$_{3}$ suspension.
Structure and property of the composite were investigated.
The results showed that the composite has a porous and uniform structure.
Nickel was dispersed in grain boundary and cavity in the form of fine particles.
Oxidation of nickel would induce high room--temperature resisitivity and spoil
PTC effect. It can be avoided by protection of graphite during sintering.
The sintered composite has a very low room--temperature resistivity and
little PTC effect. With the absorption of oxygen in grain boundary,
PTC effect of the Ni/BaTiO$_{3}$ composite can be effectively renewed by
heat--treatment in air. The porose structure and the fine dispersal of nickel
were in favor of the renewing of PTC effect.
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Received: 30 December 2004
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