CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
Effect of zirconia tape porosity on fluorapatite surface film formation by dip coating
M P. ALBANO; L.B. GARRIDO
ELSEVIER SCI LTD
Lugar: Amsterdam; Año: 2013 vol. 39 p. 29 - 37
Thin fluorapatite (FA)layers on porous 3mol %yttria-partially stabilized zirconia(Y-PSZ) substrates have been fabricated by dipping porous zirconia tapes into aqueous 27.4 vol% fluorapatite slurries. Two porous Y-PSZ tapes with different volume fraction of porosity were developed using an acrylic latex binder: tapes with 31.4vol % porosity were prepared using 16.6 vol% starch as fugitive additive and those with 12.7 vol % porosity were fabricated without starch. The influence of the porous structure of the tape surfaces, top and bottom, on the casting rate and consequently on the layer thickness formed on each surface was studied. Layers formed on the top and bottom surface sof the tapes with 12.7 and 31.4 vol% porosity were c ompared. The formation of a thin layer on the surface of the tape was governed by both liquid entrainment and slip casting mechanisms. The data for the FA layer formation were in good agreement with the slip casting model for immersion times up to 40 s.