Hardening of fusible polysilazanes and SiC/Si.sub.3 N.sub.4 ceramics produced therefrom
US5124283A · kind A · utility
3Cited by
6References
14Claims
0Family size
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Key dates
| Filing date | Jun 11, 1991 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Jun 11, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/62
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Essentially infusible/insoluble crosslinked polysilazanes, well adapted for pyrolysis and conversion into silicon carbide and/or silicon nitride ceramic materials, are produced by intimately contacting a fusible and organic solvent soluble polysilazane starting material with an effective crosslinking amount of gaseous triflic acid, CF.sub.3 SO.sub.3 H, and in which starting polysilazane the organic radicals directly bonded to silicon atoms are saturated and/or aromatic hydrocarbon radicals and such starting polysilazane being devoid of hydrogen atoms directly bonded to a silicon atom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.