United States Patent
US Patent 5106791: Sintered microcrystalline ceramic material
US 5106791 · granted 1992-04-21
Abstract
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 2.0 weight percent of a cerium compound, consisting of a microcrystalline matrix and 0.1 to 30 volume percent whisker-like needles, whereby said cerium compound is mainly present in the needles. The whisker-like needles give this material a special tenacity combined with good abrasive results.
| Patent Number | 5106791 |
|---|---|
| Title | Sintered microcrystalline ceramic material |
| Filed | 1991-06-10 |
| Granted | 1992-04-21 |
| Inventor(s) | Gottschamel; Georg, Janz; Peter, Winkler; Herwig |
| Assignee | Treibacher Chemische Werke Aktiengesellschaft |
| Number of Claims | 31 |
Abstract
Sintered microcrystalline ceramic material based on .alpha.-Al.sub.2 O.sub.3 with an addition of 0.01 to 2.0 weight percent of a cerium compound, consisting of a microcrystalline matrix and 0.1 to 30 volume percent whisker-like needles, whereby said cerium compound is mainly present in the needles. The whisker-like needles give this material a special tenacity combined with good abrasive results.
Claim 1
Method for producing a ceramic material comprising the steps of mixing a highly disperse .alpha.-aluminum oxide monohydrate into a diluted acid solution, adding a cerium compound tothe amount of 0.01 to 2 weight percent (calculated from CeO.sub.2) referring to the aluminum oxide content, deareating and deagglomerating the suspension, drying, crushing and sintering, whereby the sintering process is performed in several stagespartially under gas pressure.
Claims
31 totalMethod for producing a ceramic material comprising the steps of mixing a highly disperse .alpha.-aluminum oxide monohydrate into a diluted acid solution, adding a cerium compound tothe amount of 0.01 to 2 weight percent (calculated from CeO.sub.2) referring to the aluminum oxide content, deareating and deagglomerating the suspension, drying, crushing and sintering, whereby the sintering process is performed in several stagespartially under gas pressure.