http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0389962-A2
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C04B35-589 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C01B21-068 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-58 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-589 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C04B35-626 |
| filingDate | 1990-03-22-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4d6cbffa07d3cfb76e5e144e01a0e534 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_f64e71effebd82c1b25043dc6cf0e14f http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_8fea8e816e03f56ba90d2c9aca8d3624 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_92f486fae91a3f568ec564c5519008b6 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_120d1c3ae649412aa9271ba8457e1c13 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_bebb3aecd4ebdcd45bfa303406a65a3e http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_41ebd3d965372357df2466475bf8fa12 |
| publicationDate | 1990-10-03-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | EP-0389962-A2 |
| titleOfInvention | Sinterable ceramic powder and method of making it, silicon nitride ceramic made therefrom, method of making it and its use |
| abstract | A) dadurch erhältlich ist, daß man mindestens eines der Oligosilazane der Formel (I)n worin a, b, c, d die Molfraktionen der jeweiligen Struktureinheiten bedeuten und wobei 0≦a≦1, 0≦b≦1, 0≦c<0°7, 0≦d<0.7, 0.3≦a+b, c+d<0.7 und n etwa 2 bis etwa 12 ist, mit mindestens einem der Chlorsilane R⁶R⁷SiCl₂, R⁸SiCl₃, Cl₂R⁹Si-CH₂CH₂-SiR⁹Cl₂, Cl₃Si-CH₂CH₂-SiR¹⁰Cl₂ bei 30 bis 300°C umsetzt, wobei unabhängig voneinander R¹, R², R⁴, R⁶, R⁷, R⁸ = H, C₁-C₆-Alkyl oder C₂-C₆-Alkenyl und R³, R⁵, R⁹, R¹⁰ = C₁-C₆-Alkyl oder C₂-C₆-Alkenyl ist, oder B) folgende Formel hatn worin R und R* gleich oder verschieden sein können und R, R* = C₁-C₄-Alkyl, Vinyl oder Phenyl und R¹ = C₁-C₄-Alkyl ist und x, y die Molfraktionen der beiden Struktureinheiten bedeuten, wobei x + y = 1 und x = 0,7-0,95 ist. The invention relates to a new sinterable ceramic powder, its production, its further processing to silicon nitride ceramic, and this material itself and its use. The sinterable ceramic powder is produced by melting a polysilazane or dissolving it in an organic solvent, suspending a powdered sintering aid in this melt or solution, then pyrolyzing the melt or the residue obtained after evaporation of the solvent in a protective gas atmosphere at 500 to 1600 ° C., whereby the polysilazane either A) can be obtained by at least one of the oligosilazanes of the formula (I) where a, b, c, d are the mole fractions of the respective structural units and where 0 ≦ a ≦ 1.0, ≦ b ≦ 1.0, ≦ c <0 ° 7, 0 ≦ d <0.7, 0.3 ≦ a + b, c + d <0.7 and n is about 2 to about 12, with at least one of the chlorosilanes R⁶R⁷SiCl₂, R⁸SiCl₃, Cl₂R⁹Si-CH₂CH₂-SiR⁹Cl₂, Cl₃Si-CH₂CH₂-SiR¹⁰Cl₂ at 30 to 300 ° C, independently of one another R¹, R², R⁴, R⁶ , R⁷, R⁸ = H, C₁-C₆-alkyl or C₂-C₆-alkenyl and R³, R⁵, R⁹, R¹⁰ = C₁-C₆-alkyl or C₂-C₆-alkenyl, or B) has the following formula wherein R and R * may be the same or different and R, R * = C₁-C₄-alkyl, vinyl or phenyl and R¹ = C₁-C₄-alkyl and x, y are the mole fractions of the two structural units, where x + y = 1 and x = 0.7-0.95. n n n A molded body can be formed from the ceramic powder obtained in this way and then produced by sintering silicon nitride ceramic. However, it is also possible to form a shaped body from the solidified melt or the unpyrolyzed residue obtained after evaporation of the solvent and then pyrolyze and sinter it.n n n Components for strong mechanical, thermal and corrosive stress can be produced from the ceramic obtained. |
| isCitedBy | http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5523267-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0560258-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0560258-A2 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0493802-A1 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0698447-A3 http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5649984-A http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0698447-A2 |
| priorityDate | 1989-03-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 73.