resumo
Partially Stabilized Zirconia samples with 7, 8 and 9 mol% MgO (Mg PSZ) were sintered at 1700 degrees C for 2 h and cooled to room temperature (2 degrees C.min(-1)), to obtain distinct phase compositions and microstructures. These materials were studied by dilatometry (DIL) up to about 1500 degrees C (heating rate of 10 degrees C.min(-1)). A detailed analysis of DIL curves is used to estimate the initial M (monoclinic) phase content and quantify the progressive conversion M -> T (tetragonal) as a function of temperature. Microstructures observed by scanning electron mi- croscopy and phase content estimates from X-ray diffraction (XRD) patterns of sintered samples and milled powders, are used to show the consistency of the DIL data analysis. Furthermore, combination of room temperature XRD and DIL data yields unique and comprehensive details on the microstructural and phase content changes with temperature (all phases, M, T and C-cubic), hardly obtained in any other manner.
palavras-chave
PARTIALLY-STABILIZED ZIRCONIA; TETRAGONAL PHASE; TRANSFORMATION; KINETICS; TEMPERATURE; BEHAVIOR; MORPHOLOGY; STEEL; ZRO2
categoria
Thermodynamics; Chemistry
autores
Rondao, AIB; Grilo, JPF; Starykevich, M; Marques, FMB
nossos autores
Ana Inês Batista Lourenço Rondão
Bolseiro de pós-Doutoramento
Fernando Manuel Bico Marques
Professor Catedrático
João Grilo
Investigador Júnior
Maksim Starykevich
Investigador JúniorProjectos
Solucao de Engenharia Microestrutural para Aumentar o Transporte Ionico Interfacial (MERIT)
agradecimentos
This work was funded by projects MERIT (POCI-01-0145-FEDER028612) and CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020), financed by national funds through FCT (Fundacao para a Ciencia e a Tecnologia)/MCTES, and by the Operational Program POCI, in its FEDER component.