Produção de cerâmicas refratárias utilizando a borra do alumínio com diferentes adições de mulita

• Autor(a) principal: Mota, Rejane Carneiro
• Data de Publicação: 2010
• Outros Autores: Argonz, Raquel, Nogueira, Ricardo Emílio Ferreira Quevedo, Sasaki, José Marcos, Oliveira, Leonardo Rodrigues de
• Tipo de documento: Artigo de conferência
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/55873
• topic: Borra; Alumínio; Mulita; Refratários

Aluminum dross, a by-product from the production of aluminum, contains a large amount of high-melting point oxides which make it a potential candidate for a refractory material. In order to improve the mechanical properties of this material, different amounts of mullite ( 0 to 35 wt%) were added. The mixtures obtained were pressed into bars and sintered at 1400ºC for 1h. The pyrometric cone equivalent (PCE) was determined. Linear retraction tests upon sintering gave results ranging from 1,48 and 7,97%, as the amount of mullite was increased. Apparent porosity and water absorption decreased with increasing amounts of mullite (from 41,35 to 8,59%, and 22,16 to 3,70%, respectively). Apparent density increased with the amount of mullite (from 1,86 g/cm3 to 2,59g/cm3). The modulus of rupture (MOR), assessed by three-point bending, also increased with mullite content (from 14,14MPa to 56,35MPa).