Agradeço meu orientador, Prof. Dr. Rafael Salomão pelo acolhimento, paciência e confiança não somente durante o período que pudemos trabalhar juntos, mas também por viabilizar a finalização do meu mestrado. Sou grata pela inspiração e exemplo de um ótimo professor, com dedicação ao ensino e à pesquisa, sempre com atitudes corretas e justas as quais levarei para toda a minha carreira. Às agências de fomento pelo financiamento da pesquisa. O presente trabalho foi realizado com apoio da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-Brasil (CAPES)-Código de Financiamento 001. Ao CNPQ (Processos 455861/2014-5, 470981/2011-3) e FAPESP (Processos 2010/19274-5, 2017/06738-2). À Almatis (Brasil e Alemanha), Alcoa Aluminio S.A. (Brasil) e a Nouryon (Brasil) pelo fornecimento das matérias-primas. Aos técnicos e funcionários do Departamento de Engenharia de Materiais e Manufatura pelos momentos de descontração e pela ajuda no desenvolvimento da parte prática e burocrática da pesquisa, em especial ao João Bernardi,
Colloidal silica (CS) is a promising raw material for refractory castable ceramics. It consists of stable suspensions of synthetic amorphous silica nanoparticles that behave simultaneously as liquid medium and binder for ceramic particles and as a porogenic agent and highly reactive source of silica to promote in-situ reactions. The setting mechanism of CS balances two opposite effects. Adding more CS to a suspension increases the bonding potential for gelling reactions and strengthening; on the other hand, it also introduces more water into the system, enhancing pore content. Such effects can be advantageously employed in the preparation of porous structures from aqueous suspensions and applied as high-temperature thermal insulators. The present study addresses the production of porous structures of in-situ mullite attained from aqueous suspensions of highly porous transition alumina particles bonded with colloidal silica. Different grades of CS and transition aluminas were combined to present suitable workability (flowability and gelling time) and to generate stoichiometric mullite or mullite-alumina porous structures after sintering.
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