CETMIC 05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
artículos
Título:
Isothermal sintering kinetic of 3YTZ and 8YSZ: Cation diffusion
Autor/es:
G. SUAREZ, N.M.RENDTORFF, A. N.SCIAN, E.F. AGLIETTI
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 39 p. 261 - 268
ISSN:
0272-8842
Resumen:
We havestudiedthesinteringkineticof3and8mol%ofyttriastabilizedzirconiaunderisothermalconditions.Sinteringwas performed inthetemperaturerangebetween1200and1450 1C. Thesinteringkineticprocesswasfollowedbymeasuringdensityasa function ofsinteringtime.Amodelwasappliedtothefirststageofdensification.Sinteringobeystothegrainboundarydiffusion mechanism forbothmaterials.Itwaspossibletocalculatetheactivationenergyaswellasthediffusioncoefficients.887and 731 kJmol1 were theactivationenergiesfortheinitialstageofsinteringfor3YTZand8YSZrespectively. Finally thediffusionactivationenergywasestimatedforbothmaterials.Thediffusioncoefficientswerealsoestimatedat1400 1C in 4.051014 and 6.001011 cm2 s1 for tetragonalandcubiczirconiarespectively.Theobtainedresultssupporttheobservationsofa faster densificationfor8YSZ. 1C. Thesinteringkineticprocesswasfollowedbymeasuringdensityasa function ofsinteringtime.Amodelwasappliedtothefirststageofdensification.Sinteringobeystothegrainboundarydiffusion mechanism forbothmaterials.Itwaspossibletocalculatetheactivationenergyaswellasthediffusioncoefficients.887and 731 kJmol1 were theactivationenergiesfortheinitialstageofsinteringfor3YTZand8YSZrespectively. Finally thediffusionactivationenergywasestimatedforbothmaterials.Thediffusioncoefficientswerealsoestimatedat1400 1C in 4.051014 and 6.001011 cm2 s1 for tetragonalandcubiczirconiarespectively.Theobtainedresultssupporttheobservationsofa faster densificationfor8YSZ.
