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Abstract

Ultrafine spherical nickel powder for use in a laminate ceramics capacitor is produced through a process employing a vapor phase chemical reaction between nickel chloride and hydrogen. The process includes the steps of: i) charging a reaction vessel with nickel chloride and evaporating the nickel chloride to generate vapor of nickel chloride; ii) mixing an inert gas with the vapor of the nickel chloride to form a mixture gas having a nickel chloride gas concentration of 0.05 to 0.3, and sending the mixture gas to a reaction zone; iii) bringing, in the reaction zone, the mixture gas into contact and mixing with hydrogen which is supplied from a nozzle at a temperature of 1004.degree. C. to 1453.degree. C., in such a manner that the flow rate ratio of the hydrogen to the mixture gas meets the condition of (H.sub.2 /(NiCl.sub.2 +inert gas)) <1, thereby causing the chemical reaction; and iv) cooling the generated ultrafine nickel powder together with the gas and collecting the ultrafine nickel powder.

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First Claim