resumo
MgO-doped partially stabilized zirconia (MgPSZ) is a ceramic where three phases (cubic, tetragonal and monoclinic zirconia) might coexist due to non-equilibrium conditions and proper quantification of phase content is difficult. Here, a few selected compositions (in the 7-10 mol% MgO range) and firing profiles were studied in order to cover several phase compositions and microstructural features. An original attempt is made to correlate data obtained by X-ray diffraction (XRD), dilatometry (DIL) and scanning electron microscopy (SEM). Distinct software packages used in the analysis of XRD patterns of different samples confirmed the shortcomings of the assessment of phase content in sintered bodies while proper handling of DIL data provided complementary quantitative information on their phase content. The suggested procedure can be further used to obtain a subtle insight on phase development with temperature, subject of major relevance with respect to tuning of the mechano-thermal behavior of these ceramics.
palavras-chave
PARTIALLY-STABILIZED ZIRCONIA; MG-PSZ; THERMAL-EXPANSION; SHOCK RESISTANCE; TETRAGONAL PHASE; ZRO2-MGO SYSTEM; TRANSFORMATION; KINETICS; BEHAVIOR; STEEL
categoria
Materials Science
autores
Rondao, AIB; Soares, MR; Tobaldi, DM; Ferreira, A; Labrincha, JA; Marques, FMB
nossos autores
Ana Inês Batista Lourenço Rondão
Bolseiro de pós-Doutoramento
Artur Jorge Faria Ferreira
Professor Coordenador
David Maria Tobaldi
Investigador
Fernando Manuel Bico Marques
Professor Catedrático
João António Labrincha Baptista
Professor Catedrático
Maria do Rosário Teixeira Soares
Técnico de LaboratórioGrupos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
G4 - Materiais Renováveis e Economia Circular
agradecimentos
This work was funded by CICECO - Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013), financed by national funds through FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. A research grant from FCT, Portugal (A. Rondao, SFRH/BDE/52139/2013) is also highly appreciated.