Processamento Coloidal de Cromito de Lantânio / LANTHANUM CHROMITE COLLOIDAL PROCESSING
AUTOR(ES)
Luiz Fernando Grespan Setz
DATA DE PUBLICAÇÃO
2009
RESUMO
Lanthanum chromite (LaCrO3) is currently the most studied material for applications such as solid oxide fuel cell interconnector (HTSOFC). The complexity of microstructures and geometries of HTSOFC devices, require a precise control of processing parameters to get the desired combination of properties and this, the use of techniques involving concentrated ceramic slips conformation are appropriate, therefore, is well controlled, assist in obtaining homogeneous parts, reproductive and complex geometries. Thus, studies involving the surface chemistry, the stability conditions and slips flow behaviour in the forming conditions, provide important elements for processes control in the interconnectors manufacture, where more applied settings have slots and channels for the gases passage. Thus, surface chemistry, stability and rheological behaviour of strontium and cobalt doped LaCrO3 (La0.80Sr0.20Cr0.92Co0.08O3) slips prepared with ethanol and water, were studied. The doped lanthanum chromite was produced by combustion synthesis in the IPEN/SP labs. The influence of parameters: pH (water), dispersant concentration, homogenization times and conditions, solid concentration, different ratios binder:plasticizer in the stability and the flow behavior of ceramic suspensions prepared were evaluated. The La0.80Sr0.20Cr0.92Co0.08O3 products obtained by casting aqueous slips in a plaster mould, using alkaline pH and anionic polyelectrolyte and tapes obtained by using ethanol as a dispersant medium, after sintering at 1600ºC/4hours presented theoretical density >94%, suitable for use as HTSOFC interconnector. SUMÁRIO
ASSUNTO(S)
química de superfície química de superfície cromito de lantânio síntese por reação de combustação reologia síntese por reação de combustão. cromito de lantânio reologia
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