Effect of Er2O3 Addition on Crystallization Behavior and Properties of Lithium Disilicate Glass Ceramics

doi:10.11901/1005.3093.2024.259

Chinese Journal of Materials Research

2025, Vol. 39

Issue (6): 455-462 DOI: 10.11901/1005.3093.2024.259

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Effect of Er₂O₃ Addition on Crystallization Behavior and Properties of Lithium Disilicate Glass Ceramics

YUAN Xinyu, SHI Fei, LIU Jingxiao(

), ZHANG Haojie, YANG Dayi, WANG Meiyu, REN Ming

School of Textile and Materials Engineering, Key Laboratory of New Materials and Material Modification in Liaoning Province, Dalian Polytechnic University, Dalian 116034, China

Cite this article:

YUAN Xinyu, SHI Fei, LIU Jingxiao, ZHANG Haojie, YANG Dayi, WANG Meiyu, REN Ming. Effect of Er₂O₃ Addition on Crystallization Behavior and Properties of Lithium Disilicate Glass Ceramics. Chinese Journal of Materials Research, 2025, 39(6): 455-462.

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Abstract

Lithium disilicate glass-ceramics of Li₂O-K₂O-MgO-Al₂O₃-SiO₂-ZrO₂-CeO₂-P₂O₅ were prepared by melting-crystallization method. The effect of Er₂O₃ addition on the crystallization, microstructure and properties of the glass-ceramics was investigated. The results show that Er₂O₃ has significant regulating effect on the precipitation, microstructure and properties of the glass ceramics. When an appropriate amount of Er₂O₃ (0.4%, mole fraction) was added to the glass, it could effectively reduce the crystallization activation energy of Li₂SiO₃ and Li₂Si₂O₅, and promote glass crystallization. The prepared glass-ceramics have interlocked grains, while the glass phase is closely bound to the crystal phase, which helps to prevent crack extension and achieve the best mechanical properties. The average three-point flexural strength reaches (376±61) MPa, with the microhardness reaching (6423±284) MPa, and the glass ceramic exhibits good translucence. Whereas, when an excessive amount of Er₂O₃ is added to the glass, the increase in the size of the precipitated crystals and the enhancement of the coloring effect of Er³⁺ will lead to a decrease in the mechanical properties and transparency of lithium disilicate glass ceramics. This work is of great significance for developing lithium disilicate glass ceramics and promoting their application in dental prosthetics.

Key words: inorganic non-metallic materials lithium disilicate Er₂O₃ glass-ceramic flexural strength translucency

Received: 12 June 2024

ZTFLH:

R783.1

Fund: Joint R & D Fund of Liaoning Province Shenyang National Research Centre for Materials Science Project(2019JH3/30100013)

Corresponding Authors: LIU Jingxiao, Tel: (0411)86323708, E-mail: drliu-shi@dlpu.edu.cn

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	YUAN Xinyu
	SHI Fei
	LIU Jingxiao
	ZHANG Haojie
	YANG Dayi
	WANG Meiyu
	REN Ming

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.259 OR https://www.cjmr.org/EN/Y2025/V39/I6/455

Table 1 Glass compositions of lithium disilicate glasses with different Er₂O₃ content (mole fraction, %)

Fig.1 DTA curves for matrix glasses with different Er₂O₃ contents

Fig.2 Fitted curves of ln(β/T $p 2$ ) versus 1000/T_p variation for the crystallization peaks of Li₂SiO₃ and Li₂Si₂O₅ of glasses with different Er₂O₃ contents (a) Li₂SiO₃; (b) Li₂Si₂O₅

Table 2 Characteristic temperatures and corresponding activation energies of each glass sample of different Er₂O₃ content

Fig.3 XRD patterns of glass-ceramic samples prepared by different heat treatment process from the base glasses with different Er₂O₃ contents (a) 650 ^oC for 1 h; (b) 650 ^oC for 1 h, 860 ^oC for 20 min; (c) crystal phase content of Li₂SiO₃ and Li₂Si₂O₅ in the obtained glass ceramic after heat-treatment at 650 ^oC for 1 h and 860 ^oC for 20 min successively

Fig.4 SEM and EDS images of glass-ceramic samples prepared from matrix glasses with different Er₂O₃ contents by holding at 650 ^oC for 1 h and 860 ^oC for 20 min (a) Er₀; (b) Er_0.4; (c) Er_0.8; (d) Er_1.2; (e) EDS of Er_1.2; (f) EDS elemental analysis results

Fig.5 Comparison of three-point flexural strength and microhardness tests of glass-ceramic samples pre-pared from matrix glasses with different Er₂O₃ contents after two stage crystallization heat treatment

Fig.6 Schematic diagram of the regulation mechanism of the morphology of Li₂Si₂O₅ crystals by adding different Er₂O₃ amount

Fig.7 Density of the matrix glasses and glass-ceramic samples prepared by two stage crystallization at 650 and 860 ^oC with different Er₂O₃ contents, and the density increment after heat treatment

Fig.8 Chemical solubility in acetic acid solutions of the glass-ceramic samples prepared from matrix glasses with different Er₂O₃ contents by heat treatment at 650 and 860 ^oC successively

Fig.9 Transmittance and physical photos of glass-ceramic samples prepared by crystallization heat treatment at 650 and 860 ^oC of matrix glass with different Er₂O₃ contentss

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