Method for producing transparent polycrystalline body with high ultraviolet transmittance
US5244849A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 6, 1987 |
| Grant date | Sep 14, 1993 |
| Priority date | — |
| Expiry date | May 6, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/443
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing a transparent polycrystalline magnesia-alumina spinel body having high ultraviolet transmissivity and high strength and hardness characteristics is provided. A closed porosity body is formed from a spinel powder preferably having at least minimum purity characteristics. The closed porosity body can be formed by techniques including hot pressing and pressureless sintering. The closed porosity body is subjected to a hot isostatic pressure treatment to reduce residual porosity. The resulting body has high transmissivity of electro-magnetic radiation in the range between about 0.2 microns and about 6 microns and is resistant to abrasion or erosion, has high strength, and does not substantially deteriorate after exposure to ultraviolet light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.