Fracture toughness and hardness of transparent MgO-Al2O3-SiO2 glass-ceramics

Autor(es)

Gallo, Leonardo Sant'Ana ; Celarie, Fabrice ; Bettini, Jefferson ; Rodrigues, Ana Candida M. D. ; Rouxel, Tanguy ; Zanotto, Edgar D.

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 48, n. 7, p. 12-pg., 2022-02-26.

Resumo

Hard and strong transparent glass-ceramics (TGCs) can be used as cooktop plates, telescope mirrors, armor materials, and screens for smartphones and tablets. In this work, transparent glass-ceramics from the MgO-Al2O3-SiO2 (MAS) system were obtained after a refined heat-treatment protocol. The evolution in fracture toughness, KIC (Single Edge Precracked Beam), and Vickers hardness (H-V) were characterized as a function of the crystallization progress. The K-IC of the parent glass was 0.6 MPa m(1/2), whereas the TGC samples present values around 1.1 MPa m(1/2). The average glass hardness was 8.5 & PLUSMN; 0.8 GPa for loads of 0.6-5 N, whereas the H-V of the TGC samples varied from 9 to 10 GPa, for indentation loads ranging from 4.9 to 9.8 N. These results are discussed in light of our previous findings on the evolution of elastic modulus in the same glass-ceramics. (AU)

• Processo FAPESP: 14/03004-0 - Propriedades mecânicas de vitrocerâmicas do sistema CaO-MgO-Al2O3-SiO2
• Beneficiário: Leonardo Sant'Ana Gallo
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs