Process for preparing high purity alpha-alumina
US4615875A · kind A · utility
17Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1986 |
| Grant date | Oct 7, 1986 |
| Priority date | — |
| Expiry date | Feb 3, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S516/921
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High purity alumina with a low sodium content and with a friable, easily ball milled structure is produced in this invention through a modified sol-gel procedure which includes digestion of the contaminant containing aluminum metal with hydrochloric acid in the presence of excess aluminum, removal of the contaminants, seeding the resulting sol with high purity alumina, drying to a solid, and then calcining said seeded sol solids to produce said high purity alpha alumina.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.