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- Title
Chemical Strengthening of Li<sub>2</sub>O-ZrO<sub>2</sub>-SiO<sub>2</sub> (LZS) and Li<sub>2</sub>O-ZrO<sub>2</sub>-SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub> (LZSA) Sintered Glass-Ceramics.
- Authors
Teixeira, Luyza Bortolotto; de Moraes, Elisângela Guzi; de Oliveira, Antonio Pedro Novaes
- Abstract
Ion exchange is a chemical method to increase the mechanical strength on the surface of glass-based materials, in which an exchange between an alkaline ion with smaller radius (from glass) and an alkaline ion with larger radius (from molten salt) is promoted. This creates a superficial compression layer, resulting in mechanical strengthening, compensating the cracks created during processing and use of those glass-based materials. In this context, lithium-based sintered glass-ceramics belonging to the Li2O-ZrO2-SiO2 (LZS) and Li2O-ZrO2-SiO2-Al2O3 (LZSA) systems were summited to ion exchange in a NaNO3 salt bath. The temperatures used in these processes varied from 430°C to 500°C, with immersion times from 15 min to 3 h. After the thermal chemical processes, the LZS glass-ceramics presented a sodium content from 0.20 wt.% to 3.11 wt.%, layer depth up to 2500 µm, and mechanical strength increase up to 19.6%. For the LZSA glass-ceramics, the sodium content varied from 0.23 wt.% to 1.03 wt.% and a layer depth up to 2300 µm was obtained, with a 30.4% mechanical strength decrease. For both glass-ceramics systems, a diffusion coefficient in the order of 10−5 cm2/s and a Weibull modulus increase were demonstrated. For comparison, the results of previous research work, in which ion exchange using a NaNO3 salt paste method, are also related.
- Subjects
CHEMICAL processes; GLASS-ceramics; ION exchange (Chemistry); FUSED salts; DIFFUSION coefficients; SURFACES (Technology)
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2022, Vol 74, Issue 11, p4188
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-022-05340-x