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Cerâmica

versão impressa ISSN 0366-6913versão On-line ISSN 1678-4553

Resumo

YOSHIMURA, H. N. et al. Low cost partially-stabilized zirconia ceramic produced by powder mixing with additives of MgO-Y2O3-CaO system. Cerâmica [online]. 2007, vol.53, n.326, pp.116-132. ISSN 0366-6913.  http://dx.doi.org/10.1590/S0366-69132007000200003.

The feasibility of producing partially stabilized zirconia (PSZ) ceramics using a commercial monoclinic zirconia powder with the addition of MgO, Y2O3, and/or CaO by powder mixing route was studied. The adopted methodology aimed mainly to lower the raw-material cost. PSZ samples with cylindrical shape with single and mixed additions were prepared by sintering between 1500 and 1700 °C in the tetragonal-cubic two-phase region. The samples were ground in a centerless grinding machine and the surface roughness was measured. Crystalline phases (X-ray diffraction, Rietveld method), microstructure (scanning electron microscopy), density/porosity, Vickers hardness, fracture toughness, and biaxial flexural strength of the sintered samples were measured. In general, the best sintering temperature was 1500 °C. The best additive compositions were one with single addition of MgO and three with mixed additions containing Y2O3. The results of these samples sintered at 1500 °C were close to the results of a commercial Mg-PSZ sintered at 1700 °C.

Palavras-chave : zirconia; additive; processing; mechanical properties; sintering.

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