Microstructure evaluation of 3YSZ sintered by Two-Step Flash Sintering

Autor(es)

Lavagnini, Isabela R. ^[1] ; Campos, Joao V. ^[1] ; Pallone, Eliria M. J. A. ^{[2, 1]}

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, USP FZEA, Postgrad Programme Mat Sci & Engn, Av Duque Caxias Norte 225, BR-13635900 Pirassununga, SP - Brazil

^[2] Univ Sao Paulo, Fac Anim Sci & Food Engn FZEA, Dept Biosyst Engn, BR-13635900 Pirassununga, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 47, n. 15, p. 21618-21624, AUG 1 2021.
• Citações Web of Science: 1

Resumo

Flash Sintering (FS) is an energy-efficient sintering technique, which allows a considerable reduction in processing time and temperature. However, a recurring problem of flash sintered samples is the microstructural heterogeneity, which occurs mostly on samples with a high surface-to-volume ratio (e.g., cylindrical samples). Thus, aiming to obtain homogeneous microstructures and smaller grain sizes, this work evaluated the application of Two-Step Flash Sintering (TSFS) in 3YSZ and compared them with samples sintered by FS. The TSFS experiments consisted of applying a first step of current density with greater magnitude (100 mA mm-2 and 200 mA mm-2) followed by the second step with smaller magnitude (50 mA mm-2 and 75 mA mm-2). In the FS experiments, a single step of current density was used (100 mA mm-2 and 200 mA mm-2). The Results showed that TSFS significantly reduced the microstructural heterogeneity compared to FS, promoting smaller and more homogeneous grain sizes in different regions of the samples. (AU)

• 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: 15/07319-8 - Estudo de sinterização ultra rápida e de baixo consumo energético: flash Sintering
• Beneficiário: Eliria Maria de Jesus Agnolon Pallone
• Modalidade de apoio: Auxílio à Pesquisa - Regular