Effect of Single-Step Heat Treatment Temperature on Structure and Properties of Transparent Li2O-Al2O3-B2O3-La2O3 Glass-Ceramics

doi:10.16552/j.cnki.issn1001-1625.2025.0612

Abstract

Abstract:

A novel SiO₂-free aluminoborate glass demonstrates outstanding cracking resistance and shows considerable potential for application as cover glass. In this work， La₂O₃-containing aluminoborate glass-ceramics were successfully fabricated via high-temperature melt-casting method. The effect of one-step heat treatment temperature on the structural and functional was systematically investigated. The results reveal that increasing the heat treatment temperature from 585 ℃ to 630 ℃，［BO₃］ units in the glass network gradually convert into ［BO₄］ tetrahedral coordination. Simultaneously， LiAl₇B₄O₁₇ and Li₂AlB₅O₁₀ crystalline phases precipitate in progressively greater quantities. Grain size increases， and morphology evolves from a purely granular particles form to a microstructure where granular particles and short-rod crystals coexist. The crystallinity degree rises markedly from 49.6% to 88.9%， accompanied by a reduction in visible light transmittance from 87.28% to 57.75%. With increasing heat treatment temperature， Vickers hardness continuously increases. Under 600 ℃ heat treatment condition the specimen exhibits optimum comprehensive properties， achieving a Vickers hardness of 6.24 GPa， a fracture toughness of 1.12 MPa·m^1/2， a visible light transmittance of 87.28%， and a cracking resistance of 19.1 N. These findings demonstrate that optimizing the heat treatment temperature enables a synergistic enhancement of hardness， transparency， and damage resistance. This study offers a novel pathway for designing high-performance， transparent glass-ceramics cover glass materials.

Key words: aluminoborate glass, glass-ceramics, heat treatment, transmittance, damage resistance

CLC Number:

TQ171.1

HU Sijia, XIE Hailei, ZHOU Kun, DUO Shuwang, SHI Jiang. Effect of Single-Step Heat Treatment Temperature on Structure and Properties of Transparent Li₂O-Al₂O₃-B₂O₃-La₂O₃ Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(1): 288-298.

Figures/Tables 15

Table 1 Raw materials and manufacturers

原料	纯度	生产厂家
Li₂CO₃	分析纯 AR	国药集团化学试剂有限公司
Al₂O₃	分析纯 AR	国药集团化学试剂有限公司
B₂O₃	分析纯 AR	国药集团化学试剂有限公司
TiO₂	化学纯 CP	国药集团化学试剂有限公司
NH₄H₂PO₄	分析纯 AR	西陇科学股份有限公司
CaCO₃	分析纯 AR	国药集团化学试剂有限公司
La₂O₃	分析纯 AR	国药集团化学试剂有限公司

Table 2 Heat treatment regime for glass samples

Sample	L-585	L-600	L-615	L-630
Crystallization temperature/℃	585	600	615	630
Insulation time/h	2	2	2	2

Fig.1 DSC curve of parent glass

Fig.2 XRD patterns of glass-ceramics at different heat treatment temperatures

Table 3 Crystallinity and crystal phase content of glass-ceramics at different heat treatment temperatures

Sample	L-600	L-615	L-630
Crystallinity degree/%	49.6	65.2	88.9
LiAl₇B₄O₁₇ content/%	43.2	54.4	64.3
Li₂AlB₅O₁₀ content/%	6.4	10.8	24.6

Fig.3 SEM images of glass-ceramics at different heat treatment temperatures

Fig.4 FTIR spectra of glass-ceramics at different heat treatment temperatures

Fig.5 Visible light transmittance of glass-ceramics at different heat treatment temperatures

Table 4 Visible light transmittance of glass-ceramics at 550 nm wavelength at different heat treatment temperatures

Sample	L-20	L-585	L-600	L-615	L-630
Transmittance/%	89.19	89.94	87.28	85.85	57.75

Fig.6 Bulk density of glass-ceramics at different heat treatment temperatures

Fig.7 HV and fracture toughness of glass-ceramics at different heat treatment temperatures

Fig.8 Cracking probability curves and CR measurement value of glass-ceramics at different heatment temperatures

Fig.9 Scratch test results of glass-ceramics at different heat treatment temperatures

Fig.10 Scratch statistical analysis of glass-ceramics

Fig.11 Comparison of properties of glass-ceramics at different heat treatment temperatures

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Effect of Single-Step Heat Treatment Temperature on Structure and Properties of Transparent Li₂O-Al₂O₃-B₂O₃-La₂O₃ Glass-Ceramics

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