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FIZIKA A 4 (1995) 2, 413-422
 
A STUDY OF NICKEL ZIRCONIA COMPOSITE MATERIALS PREPARED BY GEL
PRECIPITATION METHOD IN NONAQUEOUS MEDIA
JADRAN MAČEK and MARJAN MARINŠEK
University of Ljubljana, Dept. of Chemistry and Chem. Technology, 61000 Ljubljana,
Aškerčeva 5, P.O.B. 537, Slovenia
Received 7 April 1995
Revised manuscript received 14 July 1995
Dispersions of nickel in a ceramic support was made by gel precipitation method and
hydrolysis of a mixture of nickel chloride and zirconium tetrachloride dissolved in
methanol. The substitution methanol for water was made to obtain a reaction medium in
which a better control over the hydrolysis and condensation reactions, and thus also a
better control over the final properties of the composite material, could be obtained. The
mixed precipitates were dried and calcined. Homogeneous dispersion, of nickel in the
ceramic matrix were obtained by temperature programmed reduction. A study of the influence
of reaction conditions and chemical compositions on the properties of the final products
was made. Besides chemical analysis, BET method and particle size determination, the final
products were characterised by conductivity measurements, XRD and SEM. High homogeneity of
the products obtained in this process and their appropriate chemical composition assure
good conductivity of the samples. Crystalization of the ceramic support changes with the
chemical composition of the thermally treated mixed composite material.
UDC 538.935
PACS 81.30.Mh
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