Ultrafine spherical nickel powder for use as an electrode of lam

Details Ultrafine spherical nickel powder for use as an electrode of lam Ultrafine spherical nickel powder for use as an electrode of lam

1995-10-02

1998-12-29

Ip, Sikyin

Specialized metallurgical processes, compositions for use therei

Processes

Producing or purifying free metal powder or producing or...

75363, 75369, 75953, 148426, B22F 100

Patent

active

058534512

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.

REFERENCES:
patent: 4383852 (1983-05-01), Yoshizawa
patent: 4810285 (1989-03-01), Otsuka et al.

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