Process for producing fine spherical particles having a low oxygen content
US4808217A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1988 |
| Grant date | Feb 28, 1989 |
| Priority date | — |
| Expiry date | May 23, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F1/065
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process is disclosed for producing fine spherical particles from a starting fine powder material which comprises entraining the powder material in a carrier gas, passing the powder material and the carrier gas through a high temperature zone, and maintaining the powder in the high temperature zone for a sufficient time to melt at least about 50% by weight of the particles of the powder and to form spherical particles of the melted portion, allowing the high temperature treated material to come in contact with a reducing atmosphere created by a stream of hydrogen gas, and thereafter rapidly solidifying the resulting high temperature treated material to form spherical particles wherein the oxygen content of the spherical particles is reduced by greater than about 10% by weight from the starting powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.