Influence of forming methods on the microstructure of 3YSZ flash-sintered ceramics

Autor(es)

Lavagnini, Isabela R. ; Campos, Joao, V ; Jesus, Lilian M. ; Pallone, Eliria M. J. A.

• Tipo de documento: Artigo Científico
• Fonte: MATERIALIA; v. 22, p. 6-pg., 2022-04-19.

Resumo

We evaluated the influence of three different forming methods (uniaxial and isostatic pressings and slip casting) on the densification and microstructure of cylindrical flash sintered 3mol% yttria-stabilized zirconia (3YSZ) ceramics. Conventional sintering was also analyzed as a comparison. Irrespective of the forming method applied, all the conventionally and the flash sintered specimens presented high final densities. Regarding the grain size distribution, while conventionally sintered specimens presented homogeneity over the entire ceramics, flash sintering yielded specimens with grain size heterogeneity depending on the forming method used. The microstructure of the specimens prepared with slip casting was homogeneous. On the other hand, uniaxial pressure induced bigger grains at the core of the ceramics. This heterogeneity is attributed to the presence of green density gradients in the samples prepared by uniaxial pressing, which affects the current flow and, consequently, the heat distribution within the specimens. (AU)

• Processo FAPESP: 18/19370-6 - Processamento Assistido por Campo Elétrico de Eletrocerâmicas: características (micro)estruturais e propriedades dielétricas
• Beneficiário: Lilian Menezes de Jesus
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 18/04331-5 - Instrumentação e automação de forno tubular adaptado à técnica flash sintering
• Beneficiário: João Vitor Campos
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 21/06509-9 - Sinterização com cristalização concorrente de vitrocerâmicas condutoras iônicas via flash sintering
• Beneficiário: João Vitor Campos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado