http://rdf.ncbi.nlm.nih.gov/pubchem/patent/CA-2055778-A1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_e31a7bcbf6b7edcaf10cca6f5400387f |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-18 |
| filingDate | 1991-11-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_622c76ee78732ff544c6dde2192d4106 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_77e98c3edcb21b9aec56c61ca5375951 |
| publicationDate | 1993-05-19-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | CA-2055778-A1 |
| titleOfInvention | High density leucite and / or pollucite based ceramics from zeolite |
| abstract | Substantially crack free ceramic articles having less than 5% porosity are prepared by starting with a potassium or cesium or rubidium exchanged zeolite or mixtures thereof, the zeolite characterized in that it has a SiO2/AI2O3 ratio of 3.5 to 7.5, and calcining it at a temperature of 900° to 1100°C for a time sufficient to collapse the zeolite framework and provide an amorphous powder. Next, the amorphous powder is formed into a shaped article and the article is sintered at a temperature of 1150° to 1400°C for a time of 0.5 to 12 hours to give a ceramic article whose principal crystalline phase is tetragonal leucite when potassium exchanged zeolite is used, or when the zeolite is exchanged with cesium, a ceramic article whose principal crystalline phase is pollucite is obtained, or when a rubidium exchanged zeolite is used a ceramic article whose principal crystalline phase is rubidium leucite is obtained, and when a potassium/cesium exchanged zeolite is used a ceramic article having as its principal crystalline phase a leucite/pollucite solid solution is obtained. The addition of pollucite to the leucite article provides a ceramic article whose thermal expansion coefficient can be varied from 2 x 10-6 to 27 x 10-6°C-1 as measured over the range 50°-700°C. This invention also relates to this leucite/pollucite ceramic article. |
| priorityDate | 1991-11-18-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 19.