The Crystallization and Fracture Toughness of Transparent Glass-ceramics with Various Al₂O₃ Additions for Mobile Devices

【摘要】 Li₂O-Al₂O₃-SiO₂ （LAS） glass-ceramics were prepared by a melting method.Effects of different Al₂O₃ content on the structure,crystallization,transmittance and fracture toughness of LAS glass-ceramics were investigated by means of XRD,FESEM and other methods as well.The results showed that the glass transition temperature and crystallization temperature of samples increased as the content of Al₂O₃ increased from 4.1 wt% to 13.1 wt%,which restrained the precipitation of lithium disilicate crystals.The main crystalline phase of glass-ceramics transformed from lithium disilicate and petalite to silicon dioxide,which reduced the fracture toughness of glass-ceramics.When the Al₂O₃ content was 7.1 wt%,the specimen had outstanding transmittance and fracture toughness.The transmittance was 90.32%.The fracture toughness was 1.13 MPa · m^1/2.Compared with high-alumina glass,the fracture toughness of the glass-ceramic was greatly improved,and it could be used as a new type of protective material for mobile devices.更多还原

【Abstract】 Li₂O-Al₂O₃-SiO₂ （LAS） glass-ceramics were prepared by a melting method.Effects of different Al₂O₃ content on the structure,crystallization,transmittance and fracture toughness of LAS glass-ceramics were investigated by means of XRD,FESEM and other methods as well.The results showed that the glass transition temperature and crystallization temperature of samples increased as the content of Al₂O₃ increased from 4.1 wt% to 13.1 wt%,which restrained the precipitation of lithium disilicate crystals.The main crystalline phase of glass-ceramics transformed from lithium disilicate and petalite to silicon dioxide,which reduced the fracture toughness of glass-ceramics.When the Al₂O₃ content was 7.1 wt%,the specimen had outstanding transmittance and fracture toughness.The transmittance was 90.32%.The fracture toughness was 1.13 MPa · m^1/2.Compared with high-alumina glass,the fracture toughness of the glass-ceramic was greatly improved,and it could be used as a new type of protective material for mobile devices.更多还原