| Texto completo | |
| Autor(es): |
Borges, Otavio Henrique
;
Coury, Francisco Gil
;
Brachhold, Nora
;
Aneziris, Christos Gregorius
;
Pandolfelli, Victor Carlos
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of the American Ceramic Society; v. 107, n. 12, p. 12-pg., 2024-08-21. |
| Resumo | |
On the rising demand for eco-friendly refractories, reducing the use of likely toxic magnesia-chromium aggregates remains a challenge. Previous studies by some of the authors have proposed Cr-free alternative compositions, although the morphology of the spinel precipitates has varied across the different suggested systems. The mechanisms involved in the formation of these distinct morphologies were unclear and, therefore, are the focus of this work. In all compositions, SEM/electron backscatter diffraction revealed cube-cube orientation relationships between matrix and precipitates, indicating that their formation is influenced by the lattice parameter misfit (delta), which was measured using synchrotron X-ray diffraction. It could be concluded that coarser and spherical precipitates form to minimize their surface-to-volume ratio in compositions with high absolute delta-values. Conversely, low-misfit systems enable the spinel to form a 3D-network. The potential use of this knowledge to tailor the microstructure of novel compositions was demonstrated by a small Nb2O5 addition into one of the proposed compositions. (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 |
| Processo FAPESP: | 23/00386-8 - Cerâmicas de composição complexa como alternativa aos agregados refratários à base de cromo |
| Beneficiário: | Otávio Henrique Borges |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |