| Texto completo | |
| Autor(es): |
Segatelli, Mariana Gava
[1, 2]
;
Radovanovic, Eduardo
[3]
;
Nunes Pires, Alfredo Tiburcio
[4]
;
Goncalves, Maria do Carmo
[1]
;
Pagotto Yoshida, Inez Valeria
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Londrina, Dept Chem, BR-86051990 Londrina, PR - Brazil
[3] Univ Estadual Maringa, Dept Chem, BR-87020900 Maringa, PR - Brazil
[4] Univ Fed Santa Catarina, Dept Chem, BR-88040970 Florianopolis, SC - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Materials Chemistry and Physics; v. 124, n. 2-3, p. 1216-1224, DEC 1 2010. |
| Citações Web of Science: | 7 |
| Resumo | |
This study describes the effect of multiwall carbon nanotubes MWCNT as an additional C-source on the structural and morphological features of silicon oxycarbide ceramics obtained by different heat treatment times of a hybrid polymeric precursor at 1500 degrees C under an Ar atmosphere The precursor was prepared by a hydrosilylation reaction from poly(methylsiloxane) and divinylbenzene The presence of MWCNT promoted a more effective crystallization of the SIC and c-SiO(2) phases in the resulting ceramics in comparison with those without MWCNT The heat treatment time at 1500 degrees C also affects the crystallization of the ceramic product In addition an Increase of the defect density in the Csp(2) sheets of the C(free) dispersed phase together with higher disordering of this phase were observed in the ceramics obtained from MWCNT-containing precursor The presence of MWCNT resulted in a ceramic matrix with a different morphology in relation to that observed in the absence of MWCNT with lower resistance to oxidation Moreover the extra C-source present in the ceramic matrix introduced as MWCNT reduced the solubility of SiO(2) in this matrix promoting the early segregation of SiO(4)-rich sites Consequently a more effective crystallization of SiO(2) with relatively large c-SiO(2) crystals and of beta-SiC occurred in the material with the increase of the heat treatment time (C) 2010 Elsevier B V All rights reserved (AU) | |
| Processo FAPESP: | 03/09926-1 - Materiais poliméricos e cerâmicos |
| Beneficiário: | Inez Valeria Pagotto Yoshida |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa PRONEX - Temático |
| Processo FAPESP: | 05/58460-0 - Estudos em vidros ceramicos de sicxoy ou sic, enriquecidos com fase dispersa de carbono, obtidos a partir de polimero precursor hibrido. |
| Beneficiário: | Mariana Gava Segatelli |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |