JOSE OCTAVIO ARMANI PASCHOAL
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Artigo IPEN-doc 29513 Room temperature plasticity of zirconia-yttria-titania ceramics2022 - USSUI, VALTER; LAZAR, DOLORES R.R.; LIMA, NELSON B. de; ARATA, ANELYSE; RIBEIRO, FABIO N.; DALPIAN, GUSTAVO M.; MARCHI, JULIANA; PASCHOAL, JOSE O.A.Yttria-stabilized tetragonal zirconia (Y-TZP) ceramics have excellent mechanical properties. However, such materials cannot undergo plastic deformation at room temperature due to their high hardness and brittleness values, hindering machinability. To overcome these limitations, we propose a zirconia-yttria-titania ceramics, based on zirconia containing 3mol% yttria and up to 15mol% titania. The zirconia-yttria-titania powders were synthesized by co-precipitation method, uniaxially pressed and sintered at 1400°C/5 h. Sample characterizations were carried out by X-ray diffraction, scanning electron microscopy and mechanical properties through Vickers hardness and toughness measurements. Compared to the Y-TZP ceramics, the yttria stabilised tetragonal zirconia ceramics co-doped with 10mol%Ti showed noticeable increase of tetragonality parameter, higher toughness and lower hardness values, indicating plasticity at room temperature. Furthermore, the atomistic simulation by Density Functional Theory methodology suggests the occurrence of spatial arrangement of the atoms, explaining the proposed plasticity.Livro IPEN-doc 25047 Panorama do setor de materiais e suas relações com a mineração1991 - VEIGA, MARCELLO M.; PASCHOAL, JOSE O.A.Artigo IPEN-doc 22674 Redução de tretracloreto de zircônio por magnésio1989 - MONZANI, DEIVES; PASCHOAL, JOSE O.A.Resumo IPEN-doc 22235 Obtenção do compósito YSZ/Ni para aplicação como anodo em célula a combustível do tipo óxido sólido Parte I: preparação por mistura de pós2005 - BORSATO, MARINA R.; YOSHITO, WALTER K.; LAZAR, DOLORES R.R.; PASCHOAL, JOSE O.A.Publicação IPEN-doc 03638 Estudo da cloracao de oxido de zirconio1990 - SEO, E.S.M.; TAKIISHI, H.; PASCHOAL, J.O.A.; ANDREOLI, M.Publicação IPEN-doc 03649 Estudo do processo de pelotizacao do oxido de zirconio e da zirconita1990 - SEO, E.S.M.; PASCHOAL, J.O.A.; PEREZ ACEVEDO, M.T.Artigo IPEN-doc 20497 Synthesis and mechanical properties of stabilized zirconia ceramics: MgO-ZrOsub(2) and Ysub(2)Osub(3)-MgO- ZrOsub(2)2014 - YAMAGATA, C.; MELLO CASTANHO, S.R.H.; PASCHOAL, J.O.A.Artigo IPEN-doc 20285 Systematic precipitation of magnesium hydroxide using MHsub(4)OH preparation MgO-PSZ precursor powder2015 - YAMAGATA, CHIEKO; PASCHOAL, JOSE O.A.Resumo IPEN-doc 14790 Cinetica de sinterizacao do composito de NiO-YSZ obtido pela rota de coprecipitacao2009 - YOSHITO, W.K.; RESTIVO, T.A.G.; USSUI, V.; LAZAR, D.R.R.; PASCHOAL, J.O.A.Resumo IPEN-doc 02850 Caracterizacao de compostos de terras raras obtidos na precipitacao com ureia e acido oxalico1996 - LAZAR, D.R.R.; CUNHA, S.M.; MENEZES, C.A.B.; MENEZES, F.; NOBRE, J.S.M.; PASCHOAL, J.O.A.