Porous co-continuous mullite structures obtained from sintered aluminum hydroxide and synthetic amorphous silica

Autor(es)

Salomao, Rafael ; Fernandes, Leandro

• Tipo de documento: Artigo Científico
• Fonte: Journal of the European Ceramic Society; v. 37, n. 8, p. 2849-2856, JUL 2017.
• Citações Web of Science: 5

Resumo

Porous materials produced from sintered Al(OH)(3) show a potentially useful alpha-Al2O3-based coral-like co-continuous microstructure of high porosity (above 70%) and chemical resistance. However, due to the lack of efficient connections among the particles of the solid phase, their poor mechanical properties limit their use in biomechanical and thermo-mechanical applications, as scaffolds for bone tissue and hot air filters, respectively. In this study, authors improved these connections reinforcing the structure with a sintering aid (synthetic amorphous silica, SAS). Al(OH)3 particles (previously sintered at 1500 degrees C, 5 h) were imbibed with SAS particles, compacted and sintered at 1300 degrees C, which generated a coral-like mullite-based porous structure. The porosity levels of the material (47%) were similar to those of the initial green state (50%) and achieved high levels of mechanical properties (flexural strength of 50.29 MPa, elastic modulus of 26.00 GPa), with small linear thermal shrinkage (lower than 6% at 1500 degrees C). (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/19274-5 - Nova rota de sínteses de hidrotalcita (Mg6Al2(OH)16CO3.4H2O) a partir de suspensões aquosas de óxido de magnésio (MgO) e hidróxido de alumínio (Al(OH)3) e sua utilização em cerâmicas porosas para isolamento térmico em alta temperatura
• Beneficiário: Rafael Salomão
• Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores