Method for preparing fluoride glasses
US4946490A · kind A · utility
15Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 4, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | May 4, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S65/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A new, simplified method of fabricating optically transparent fluoride glasses containing ZrF.sub.4 and/or HfF.sub.4 has been developed which relies on a high vacuum pretreatment for surface dehydration, melting in a rigorously inert argon atmosphere, and incorporation of a nonvolatile metallic oxidant in the melt such as InF.sub.3 or SnF.sub.4. Previous methods for making these glasses have relied on either addition of ammonium bifluoride into the batch materials, or melting in an oxidizing atmosphere (so-called reactive atmosphere processing or RAP); both of these latter techniques have significant drawbacks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.