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Lanthanum chromite colloidal processing; Processamento coloidal de cromito de lantanio

Abstract

Lanthanum chromite (LaCrO{sub 3}) is currently the most studied material for applications such as solid oxide fuel cell inter connector (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 inter connectors 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 LaCrO{sub 3} (La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3}) 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: p H (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 La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3} products obtained by casting aqueous slips in a plaster mould, using  More>>
Publication Date:
Jul 01, 2009
Product Type:
Thesis/Dissertation
Report Number:
ETDE-BR-2419
Resource Relation:
Other Information: TH: Tese (Ph.D.)
Subject:
30 DIRECT ENERGY CONVERSION; CHROMIUM OXIDES; CHROMITES; LANTHANUM OXIDES; MICROSTRUCTURE; SOLIDS; SOLID OXIDE FUEL CELLS; DIRECT ETHANOL FUEL CELLS
OSTI ID:
21573279
Research Organizations:
Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
TRN: BR12V1283
Availability:
Commercial reproduction prohibited; OSTI as DE21573279
Submitting Site:
BR
Size:
147 pages
Announcement Date:
Jul 16, 2012

Citation Formats

Setz, Luiz Fernando Grespan. Lanthanum chromite colloidal processing; Processamento coloidal de cromito de lantanio. Brazil: N. p., 2009. Web.
Setz, Luiz Fernando Grespan. Lanthanum chromite colloidal processing; Processamento coloidal de cromito de lantanio. Brazil.
Setz, Luiz Fernando Grespan. 2009. "Lanthanum chromite colloidal processing; Processamento coloidal de cromito de lantanio." Brazil.
@misc{etde_21573279,
title = {Lanthanum chromite colloidal processing; Processamento coloidal de cromito de lantanio}
author = {Setz, Luiz Fernando Grespan}
abstractNote = {Lanthanum chromite (LaCrO{sub 3}) is currently the most studied material for applications such as solid oxide fuel cell inter connector (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 inter connectors 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 LaCrO{sub 3} (La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3}) 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: p H (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 La{sub 0.80}Sr{sub 0.20}Cr{sub 0.92}Co{sub 0.08}O{sub 3} products obtained by casting aqueous slips in a plaster mould, using alkaline p H and anionic polyelectrolyte and tapes obtained by using ethanol as a dispersant medium, after sintering at 1600 deg C/4h presented theoretical density > 94%, suitable for use as HTSOFC inter connector. (author)}
place = {Brazil}
year = {2009}
month = {Jul}
}