Crystallization Phase Change and Mechanical Properties Characterization of LAS Glass-Ceramics after Ion Exchange

Abstract

Abstract: The Li₂O-Al₂O₃-SiO₂ (LAS) glass-ceramics is a practical glass-ceramics system with high performance. In this experiment, Li₂O, Al₂O₃ and SiO₂ were used as main raw materials, and the glass-ceramics with petalite as the main crystal phase was prepared by integral crystallization method, and then it was chemically strengthened by salt bath at low temperature for ion exchange. The surface morphology and mechanical properties of chemically strengthened LAS glass-ceramics were studied by X-ray diffractometer and scanning electron microscope. The results show that after chemical strengthening, the crystallization phase disappeares on the surface of glass-ceramics in this system, and the Vickers hardness decreases significantly, while bending strength increases. After strengthening for 10 h, an amorphous layer of 740 nm appeared on the surface, and the maximum bending strength reached 472 MPa.

Key words: glass-ceramics, ion exchange, de-crystallized phase, Vickers hardness, bending strength

CLC Number:

TQ171

HAN Han, PENG Ruixin, LI Xiaofan, ZHAO Huifeng, JIANG Hong, MA Yanping. Crystallization Phase Change and Mechanical Properties Characterization of LAS Glass-Ceramics after Ion Exchange[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3138-3144.

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