Electrophoretic deposition of ZrO2-Y2O3: A bi-component study concerning self-assemblies
Nenhuma Miniatura disponível
Citações na Scopus
6
Tipo de produção
Artigo
Data
2009-01-05
Autores
CASTRO, R. H. R.
KODAMA, P. K.
GOUVEA, D.
MUCCILLO, R.
KODAMA, P. K.
GOUVEA, D.
MUCCILLO, R.
Orientador
Periódico
Journal of Materials Science
Título da Revista
ISSN da Revista
Título de Volume
Citação
CASTRO, R. H. R.; KODAMA, P. K.; GOUVEA, D.; MUCCILLO, R. Electrophoretic deposition of ZrO2-Y2O3: A bi-component study concerning self-assemblies. Journal of Materials Science.
Texto completo (DOI)
Palavras-chave
Resumo
There are many industrial advantages of using mechanical multi-oxides mixtures to obtain ceramic parts by electrophoretic deposition (EPD). This is mainly because one could avoid complex chemical synthesis routes to achieve a desirable composition. However, EPD of these suspensions is not an easy task as well since many different surfaces are present, leading to unexpected suspension behavior. The particles surface potentials and interactions can, however, be predicted by an extension of the DLVO theory. Using this theory, one can control the suspension properties and particles distribution. The objective of this work was to apply the colloidal chemistry theories to promote the formation of a heterocoagulation between ZrO2 and Y2O3 particles in ethanol suspension to achieve a suitable condition for EPD. After identifying a condition where those particles had opposite surface charges and adequate relative sizes, heterocoagulation was observed at operational pH 7.5, generating an organized agglomerate with ZrO2 particles surrounding Y2O3, with a net zeta potential of -16.6 mV. Since the agglomerates were stable, EPD could be carried out and homogeneous deposits were obtained. The deposited bodies were sintered at 1600 °C for 4 h and partially stabilized ZrO2 could be obtained without traces of Y 2O3 second phases. © 2009 Springer Science+Business Media, LLC.