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Efeito da adição de Na2O na viscosidade e devitrificação do vidro obtido a partir de cinzas volantes e Li2O

1998; Brazilian Chemical Society; Volume: 21; Issue: 4 Linguagem: Inglês

10.1590/s0100-40421998000400031

1678-7064

Etney Neves, Edoardo D. Poffo, Márcio C. Fredel, Humberto Gracher Riella, Orestes Estevam Alarcon,

Pigment Synthesis and Properties

Li 2 O. Glass-ceramic materials can be produced by the addition of LiO 2 to fly ashes disposible in Southern Brazil.These glass-ceramics are based on the Al 2 O 3 -SiO 2 -Li 2 O system.The high viscosity of the obtained glasses, however, makes forming useful articles with these materials difficult.In this study we investigate the effect of adding low cost Na 2 CO 3 on the melt viscosity and on the nature of the developed crystalline phases.It was intended that the ultimate crystalline phase (LiAlSi 3 O 8 ) should not be altered.With additions up to 3 wt.% Na 2 CO 3 , the viscosity was apparently lowered and no new crystalline phase were detected.