Study on Crystallization Process of Li2O–Al2O3–SiO2 Glass-Ceramics Based on In Situ Analysis

• Published in: Materials Vol. 15; no. 22; p. 8006
• Main Authors: Li, Minghan, Xiong, Chunrong, Ma, Yanping, Jiang, Hong
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 12.11.2022; MDPI
• Subjects: Aluminum oxide; Ceramics; crystal growth; Crystallization; crystallization study; Crystals; Glass ceramics; Grain size; Heat treatment; High temperature; in situ analysis; Kinetics; Laser microscopy; Lasers; Li2O–Al2O3–SiO2 glass-ceramics; Lithium oxides; Mechanical properties; Methods; Microscopy; Morphology; Nucleation; Phase transitions; Silicon dioxide; Solid solutions; Temperature; China
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15228006

In this paper, we used differential scanning calorimetry (DSC), high-temperature X-ray diffraction (HT-XRD), and confocal scanning laser microscopy (CSLM) to investigate the Li2O–Al2O3–SiO2 glass crystallization process. At 943 K, lithium disilicate (Li2Si2O5) phase crystals began to precipitate in the Li2O–Al2O3–SiO2 glass with a crystal size of 50–70 nm. At the temperature of 1009 K, petalite (LiAlSi4O10) crystals began to precipitate in the vitreous phase, forming composite spherical crystals of LiAlSi4O10 and Li2Si2O5 with size in the range of 90–130 nm. Furthermore, the Kissinger method and KAS method of the JMAK model were used to calculate the crystallization activation energy and the Avrami index “n”. It was found that the precipitation mechanism of the two kinds of crystals is whole crystallization; accordingly, the selection of crystallization heat treatment system was guided to determine the nucleation and crystallization temperature.