Ultrafine spherical nickel powder for use as an electrode of laminated ceramic capacitors
US5853451A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 2, 1995 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Oct 2, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S75/953
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.