| Texto completo | |
| Autor(es): |
Borges, O. H.
;
Coury, F. G.
;
Muche, D. N. F.
;
Pandolfelli, V. C.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the European Ceramic Society; v. 43, n. 14, p. 14-pg., 2023-11-01. |
| Resumo | |
Besides the good performance of electrofused magnesia-chromite aggregate (EMCA) in ceramic refractories, the generation of toxic Cr+6 after working conditions is driving its urgent replacement. Aiming at optimizing the search towards eco-friendly options, this work applied multiple electron-microscope-based techniques to assess its key microstructural features. BSE/EDS imaging coupled with thermodynamic calculations (CALPHAD) indicated that these aggregates were comprised of a periclase matrix where spinel precipitates (d50 & AP;15 & mu;m) were embedded, inducing microcracking due to the thermal expansion mismatch. EBSD technique highlighted its pattern, revealing a good fit with {110} planes, which agrees with the Zener-Stroh crack mechanism. Designing concepts of compositionally complex ceramics were applied to find eco-friendly EMCA alternatives. From the 154 simulated systems, the four most promising ones were experimentally produced and characterized. Although kinetics aspects must be addressed, Cr-free EMCA-inspired microstructures were obtained, highlighting that this design approach can be used to support the development of novel raw materials. (AU) | |
| Processo FAPESP: | 21/00114-2 - Desenvolvimento de concretos refratários espinelizados avançados eco-amigáveis em substituição aos materiais contendo cromita |
| Beneficiário: | Otávio Henrique Borges |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |