Effect of high pressure on the mechanical properties of lithium disilicate glass ceramic

Toughening of Li2O‐2SiO2 glass‐ceramics induced by intriguing deformation behavior of lithium disilicate nanocrystal

“…The fidelity of this potential in capturing the mechanical properties of Li 2 O‐SiO 2 glass is substantiated by the good agreement of elastic modulus between simulation results and experimental measurements. As shown in Table , Young's modulus (E) of stoichiometric lithium disilicate glass measured from simulations is 75.4 GPa, which matches experimental measurement of 75 GPa from Mastelaro et al, 80 ± 2 GPa from Serbena et al, 82 ± 1 GPa from Buchner et al, and 78.9 ± 0.8 GPa from Belli et al Additionally, the simulation measured bulk modulus (B) of 29.5 GPa for lithium disilicate glass in this work also agrees well with that of 32.4 GPa experimentally measured by Belli et al…”

“…For instance, Denry et al reviewed that high crystallinity and large aspect ratio crystalline grains create interlocking microstructures that promote crack bridging and deflection in many lithium disilicate glass‐ceramics. Buchner et al observed that the densification and crystallization under high pressure and temperature noticeably improve the mechanical properties of lithium disilicate glass‐ceramics.…”

“…3,8 Over the past few decades, a considerable number of studies have demonstrated that chemical composition, crystallinity, residual stress, additives, nucleating agents, crystal size, aspect ratio, and morphologies significantly affect its mechanical properties. 8,[13][14][15][16][17][18][19] For instance, Denry et al 20 reviewed that high crystallinity and large aspect ratio crystalline grains create interlocking microstructures that promote crack bridging and deflection in many lithium disilicate glass-ceramics. Buchner et al 17 observed that the densification and crystallization under high pressure and temperature noticeably improve the mechanical properties of lithium disilicate glass-ceramics.…”

Nano-mechanical behaviour of lithium metasilicate glass–ceramic

“…This indicates that the critical contact loads to initiate fracture were exceeded. Nanoindentation techniques were also used to characterize the mechanical behavior of LDGC (Buchner et al, 2011;Soares and Lepienski, 2004). In those studies, fractures also occurred at several hundreds of milli-Newtons.…”

Influência da cristalização na dureza, módulo de elasticidade e tenacidade à fratura por indentação em vitrocerâmicas de dissilicato de lítio (Li2 O.2SiO2 )

“…Em outro trabalho, os autores examinaram o comportamento da propagação de trincas de três vitrocerâmicas submetidos à indentação Vickers e observaram que existe uma forte relação entre a microestrutura da vitrocerâmica, o caminho da trinca e a resistência do material [17]. O tratamento a altas temperaturas e pressões no vidro de dissilicato de lítio melhora as propriedades mecânicas [18]. O comportamento mecânico do metassilicato de lítio vitrocerâmico foi investigado usando nanoindentação e técnicas de imagem com sonda de varredura in situ.…”