PROCESSING OF FLUORAPATITE FILMS WITH DIFFERENT THICKNESS ON POROUS ZIRCONIA TAPES

ALBANO, M. P; GARRIDO, L, B

Natal

Congreso; 57 Congresso Brasileiro de Cerámica; 2013

Asociación Brasileira de Cerámica

Fluorapatite (FA) layers with different thickness on porous 3 mol% yttria-partially stabilized zirconia (Y-PSZ) substrates have been fabricated by dipping porous zirconia tapes into aqueous fluorapatite slurries. Two different binders,poly(vinyl)alcohol (PVA) and latex were used to prepare the fluorapatite dip coating slips. The influence of the suspension properties and the porous structure of the tape surfaces (top and bottom) on the formation rate and consequently on the layer thickness formed on each surface were studied. A greater initial thickness of the layer adhered was found for the tapes dip coated in the FA slip with latex; for immersion times>0, the casting rate at the top surface of the tapes was greater than that at the bottom surface for both dip-coating slips. The higher casting rate of the slips with latex produced layers with thickness 8-9 times greater on both tape surfaces relative to the slip prepared with PVA.