Effect of Heat Treatments on the Wetting Behavior of Bismuth-Rich Intergranular Phases in ZnO:Bi:Co Varistors

Autor:	G. E. Pike, Lionel M. Levinson, W. David Kingery, H. R. Philipp, Jeffrey P. Gambino
Rok vydání:	1989
Předmět:	Materials science Annealing (metallurgy) Metallurgy Varistor chemistry.chemical_element Intergranular corrosion Dihedral angle Bismuth chemistry Materials Chemistry Ceramics and Composites Grain boundary Wetting Composite material Cobalt
Zdroj:	Journal of the American Ceramic Society. 72:642-645
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.1989.tb06188.x
Popis:	The effect of annealing on the wetting behavior of Bi-rich intergranular phases in ZnO:Bi:Co varistors was studied. The intergranular phase exhibits temperature-dependent grain-boundary wetting, with an average equilibrium dihedral angle of 0° at 1140°C and over 55° at 610°C. The temperature-dependent wetting may be related to the temperature dependence of the ZnO concentration in the Bi2O3 liquid phase. The effect of the intergranular phase distribation on the electrical properties of ZnO varistors is discussed.
Databáze:	OpenAIRE
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