Crystallization Kinetics and Structure Refinement of CaTiO3 Glass-Ceramics Produced by Melt-Quenching Technique

Autor(es)

da Silveira, Wagner ^[1] ; Macedo, Wagner Costa ^[1] ; de Almeida Santos, Gleyson Tadeu ^[1] ; dos Santos, Luis Fernando ^[1] ; Fernandes, Jose Diego ^[1] ; Rocha, Kleper de Oliveira ^[2] ; Teixeira, Silvio Rainho ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Fac Ciencias & Tecnol, Dept Fis, BR-19060900 Presidente Prudente, SP - Brazil

^[2] Univ Estadual Paulista UNESP, Fac Ciencias, Dept Quim, BR-17033360 Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 24, n. 1 2021.
• Citações Web of Science: 0

Resumo

Glass-ceramic materials were obtained by heat treatment (960 degrees C for 2, 4, and 6 hs) of glasses with CaCO3 47.50 wt%-TiO2 23.75 wt%-SiO2 23.75-Al2O3 5.00 wt% formulation produced by the melt-quenching technique (melting at 1650 degrees C and subsequent annealing at 650 degrees C). The materials' structural characterization and crystallization kinetics (Kissinger method) indicate the presence of CaTiO3, CaSiO3, and CaTiSiO5 crystalline phases with activation energies 217, 281, and 446 kJ/mol, respectively. The structure refinement (Rietveld method) suggests metastability for the CaSiO3 and CaTiSiO5 phases as a function of the heat treatment time. The increase in time favors CaTiO3 crystallization, from 62.97 wt%, in the 2 hs treated sample, to 79.21 wt%, in the 6 hs treated sample. EDS and microstructure analyses confirm the glass-ceramic production and indicate segregation of the CaTiO3 phase for longer heat treatment times. (AU)

• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs