Method of making translucent alumina articles
US4948538A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1988 |
| Grant date | Aug 14, 1990 |
| Priority date | — |
| Expiry date | Oct 11, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of making a translucent alumina article is described. The method comprises the following steps: PA0 Step 1 - An alumina powder and a sintering aid are mixed in a liquid for a period sufficient to form a homogeneous slurry. PA0 Step 2 - The homogeneous slurry from Step 1 is dried remove the liquid to form a dried powder. PA0 Step 3 - The dried powder is shaped to form a compacted green body. PA0 Step 4 - The compacted green body from Step 3 is heated at a temperature equal to or less than 500.degree. C. and for a period sufficient to form a compacted green body having a density of at least 30% of theoretical density. PA0 Step 5 - The compacted green body having a density of at least 30% of theoretical density from Step 4 is heated at a temperature from about 800.degree. C. to about 1300.degree. C. in an oxygen containing atmosphere for a period sufficient to impart green strength to said compacted green body to form a prefired compacted green body. PA0 Step 6 - The prefired compacted green body from Step 5 is sintered at a temperature from about 1700.degree. C., to about 2000.degree. C. in an nitrogen/hydrogen atmosphere consisting essentially of nitrogen and hydrogen for a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.