A study of nickel zirconia composite materials prepared by gel precipitation method in nonaqueous media.
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.
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