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Effects of Glass-Additives on the Properties of Ni/Ceramic PTC Composites

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Abstract:

The effects of glass additives on the sintering and properties of Ni/(Ba0.92Sr0.08)TiO3 composites were investigated. Due to the addition of glass additives, Ni/ceramic composites with low room-temperature resistivity and obvious PTC effect were obtained at a low sintering temperature. It was shown that glass-additives could form liquid phase that aided the solution and diffusion of solid atoms, acting as sintering aids to accelerate the sintering and lower the sintering temperature. The room-temperature resistivity decreased first and increased later with the increasing content of glassadditives, which was explained by two functions of glass-additives, decreasing interface contact resistance as sintering aids and adding volume resistance as insulators. Moreover, a suitable amount of glass-additives could enhance the PTC effect unexpectedly, which was attributed to the decrease of the contact resistance existing at the ceramic/ceramic interface.

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Periodical:

Key Engineering Materials (Volumes 280-283)

Pages:

337-340

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.280-283.337

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Online since:

February 2007

Authors:

Yuan Fang Qu, Hua Tao Wang, Xiao Lei Li, Wei Bing Ma

Keywords:

Composite, Glass-Additives, PTC, Resistivity

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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