| Full text | |
| Author(s): |
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]
Total Authors: 7
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 24, n. 1 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |