| Texto completo | |
| Autor(es): |
Braulio, Mariana A. L.
[1]
;
Castro, Jose F. R.
[2]
;
Pagliosa, Carlos
[3]
;
Bittencourt, Luis R. M.
[3]
;
Pandolfelli, Victor C.
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Fed Sao Carlos, Dept Mat Engn, FIRE Associate Lab, BR-13656905 Sao Carlos, SP - Brazil
[2] MHNANO, Res & Dev Nanostruct Mat LTDA, Sao Carlos, SP - Brazil
[3] Magnesita SA, Ctr Res & Dev, Contagem, MG - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the American Ceramic Society; v. 91, n. 9, p. 3090-3093, SEP 2008. |
| Citações Web of Science: | 27 |
| Resumo | |
Magnesia grain size affects the in situ spinel formation kinetics and expansion of alumina-magnesia refractory castables. The use of coarse grains results in a large expansion and delays the reaction's starting temperature. In this work, the addition of an MgO source with different grain sizes (from macro, D-max <= 0.1 mm, to nano, D-50 <= 20 nm) led to a broad linear expansion range (6%-2%), considering the spinel and the CA(6) formation. The addition of nanomagnesia, produced by a centrifugal-type high-energy ball milling, to high-alumina refractory castables affected the spinel expansion and its starting temperature. The objective to estimate the reaction starting temperature was attained, reducing it from 1200 degrees to 900 degrees C. Nevertheless, the decrease of spinel expansion was not totally fulfilled, as a portion of the nanoparticles partly reagglomerated before mixing and behaved as coarser magnesia grains. (AU) | |
| Processo FAPESP: | 06/53583-0 - Concretos refratarios aluminosos espinelizados. |
| Beneficiário: | Mariana de Albuquerque Lima Braulio |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |