Mesoporous fibrous silicon nitride by catalytic nitridation of silicon
[EN] The catalytic effect of metal oxide/alumina whiskers (CeO2,Mn3O4, NiO, Co3O4,Fe2O3,Cr2O3/AW) was eval-uated on their ability to drive the nitridation of silicon and to generate mesoporousfibrous silicon networks.Silicon powder with different particles size along with the catalyst was nitridized...
| Autores: | , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/203277 |
| Acesso em linha: | http://hdl.handle.net/10261/203277 |
| Access Level: | acceso abierto |
| Palavra-chave: | Mesoporous substrate Silicon nitride Nanofibers Wet-combustion Catalytic nitridation |
| Resumo: | [EN] The catalytic effect of metal oxide/alumina whiskers (CeO2,Mn3O4, NiO, Co3O4,Fe2O3,Cr2O3/AW) was eval-uated on their ability to drive the nitridation of silicon and to generate mesoporousfibrous silicon networks.Silicon powder with different particles size along with the catalyst was nitridized at 1300 °C for 5 h in nitrogenand nitrogen diluted with 10 vol% ammonia atmospheres. Nitridation degree of silicon up to 99% was recordedusing 1.5 wt% CeO2and Fe2O3catalysts in nitrogen-ammonia atmosphere. The catalyzed samples containsubmicronic silicon nitridefibres with a diameter of 400–500 nm and a length of up to few micrometers. Thecompressive strength of 46 ± 1 MPa was measured for silicon samples catalyzed with nickel oxide/aluminawhiskers and nitridized in N2/10 vol%NH3atmosphere. Porous silicon nitride networks were produced with45–52% porosity, pore sizes in the range of 370–1200 nm and median pore in the range of 495–1655 nm. |
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