CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
DEVELOPMENT OF ZrO2/CaAl4O7 COMPOSITES FROM HIGH ALUMINA CEMENT AND DIFFERENT m- ZrO2
Autor/es:
.L. BRUNI; F. N. BOOTH; M.P. ALBANO; L.B. GARRIDO ; E.F. AGLIETTI
Lugar:
Barra dos Coqueiros ? SE,
Reunión:
Congreso; 59º Congresso Brasileiro De Cerâmica,; 2015
Institución organizadora:
AB Ceram
Resumen:
Composites containing calcia stabilized ZrO2 and CaAl4O7 (CA2) as main phases were developed from mixtures of monoclinic ZrO2 and high alumina cement (HAC) as a source of CaO by uniaxial pressing of the powder mixtures and sintering at 1300 and 1400 °C. Two commercial m-ZrO2 powders having mean particle sizes of d50=0.44 μm (fine) and d50=8μm (coarse) were used. The crystalline phase constitution, densification and compressive strength was evaluated to determine the effect of processing parameters (CaO content in the powder mixture, ZrO2 particle size and sintering temperature) on physical and mechanical properties. The cubic ZrO2 content increased from 10 to 29 vol% for 5 and 30 mol% CaO in ZrO2 respectively, and with further increase to 50 mol% CaO the proportion of c-ZrO2 reduced to 19 vol%. Porous ceramics processed with the coarse ZrO2 attained porosities between 37 and 44 % and had interconnected pores with mean size of 2 μm. Composites produced from fine ZrO2 exhibited high densification (porosities between 11 and 17 %), low mean pore size (~0.02 μm) at 1400°C resulting in a high compressive strength (350 MPa).