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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Highly translucent nanostructured glass-ceramic

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Author(s):
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]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 3
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 47, n. 4, p. 4707-4714, FEB 15 2021.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 13/07793-6 - CEPIV - Center for Teaching, Research and Innovation in Glass
Grantee:Edgar Dutra Zanotto
Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC