| Texto completo | |
| Autor(es): |
Soares, Viviane Oliveira
[1]
;
Serbena, Francisco Carlos
[2]
;
Oliveira, Gabriel dos Santos
[1]
;
da Cruz, Crislaine
[2]
;
Muniz, Robson Ferrari
[1]
;
Zanotto, Edgar Dutra
[3]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] State Univ Maringa UEM, Dept Sci, BR-87360000 Goioere, PR - Brazil
[2] State Univ Ponta Grossa UEPG, Dept Phys, BR-84030900 Grossa, PR - Brazil
[3] Fed Univ Sao Carlos UFSCar, Dept Mat Engn DEMa, Vitreous Mat Lab LaMaV, BR-13565905 Sao Carlos, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CERAMICS INTERNATIONAL; v. 47, n. 4, p. 4707-4714, FEB 15 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Transparent and translucent glass-ceramics (GCs) are found in an increasing number of domestic and high-technology applications. In this paper, we evaluated and optimized the effects of two-stage heat treatments on the resulting crystalline phases and microstructure of a glass of the SiO2-Li2O-P2O5-TiO2-CaO-ZnO-Al 2O3 system. The objective was to develop a transparent nanostructured glass-ceramic (GC). After numerous heat treatment trials, we found that a long nucleation period of 72 h at 455 degrees C followed by a crystal growth treatment at 660 degrees C for 2 h resulted in a highly translucent GC having homogenously distributed nanocrystals. The relatively high amount of P2O5 (2.5 mol%) induced the formation of lithium disilicate as the main crystal phase. We thus developed a GC having crystals under 50 nm, with a high crystallized fraction (52%vol. Li2Si2O5 and 26% vol Li2SiO3), transmittance of approximately 80% in the visible spectrum for 1.2 mm thick specimens, nano hardness of 8.7 +/- 0.1 GPa (load of 400 mN), a high elastic modulus of 138 +/- 3 GPa as measured by nanoindentation, and good flexural strength (350 +/- 40 MPa) as measured by ball-on-3 balls tests. Due to its high content of Li+, this GC has the potential to be chemically strengthened and can be further developed to be used in a number of applications, such as on displays of electronic devices. (AU) | |
| Processo FAPESP: | 13/07793-6 - CeRTEV - Centro de Pesquisa, Tecnologia e Educação em Materiais Vítreos |
| Beneficiário: | Edgar Dutra Zanotto |
| Modalidade de apoio: | Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs |