| 杨佳玉,胡贵寒,吴渊,龚非凡,王文强,张栋梁,王觅堂.La2O3替代Al2O3和Li2O对微晶玻璃析晶及性能的影响[J].有色金属材料与工程,2026,47(2):59-69. |
| La2O3替代Al2O3和Li2O对微晶玻璃析晶及性能的影响 |
| Influence of La2O3 substitution for Al2O3 and Li2O on the crystallization and properties of glass-ceramics |
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| DOI：10.13258/j.cnki.nmme.20250909001 |
| 中文关键词: 稀土 ZrO2析晶 微观结构 透过率 力学性能 |
| 英文关键词:Rare earths ZrO2 crystallization microstructure transmittance mechanical properties |
| 基金项目:中国北方稀土（集团）高新技术有限公司重点项目（BFXT-2023-D-0043）；国家自然科学基金资助项目（51974168） |
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| 中文摘要: |
| 研究了不同La2O3含量的稀土铝硅酸盐微晶玻璃。通过使用La2O3同时替代Al2O3和Li2O，探讨了基础玻璃的力学性能和热处理后微晶玻璃的微观结构和力学性能的影响。随着La2O3的增加，玻璃转变温度Tg增加，析晶峰的温度TP也逐渐增加。玻璃热处理后，析出ZrO2晶体和含La的Cerite-(La)晶体。析晶后的玻璃的力学性能，包括硬度、弹性模量、抗裂纹萌生能力和断裂韧性都得到了提高。随着La2O3含量增加到4 mol%时，基础玻璃和析晶后的玻璃力学性能都增加了。但是La2O3含量超过4 mol%时，基础玻璃的力学性能下降，同时玻璃析晶量减少导致析晶后玻璃的力学性能也开始下降。 |
| 英文摘要: |
| Rare-earth aluminosilicate glass-ceramics with different La2O3 contents are studied in this paper. This study is carried out to explore how La2O3 affects the properties of the materials. Al2O3 and Li2O are simultaneously substituted by La2O3 during the glass preparation. Different substitution amounts of La2O3 are set to observe the corresponding changes. The influence of this substitution on the mechanical properties of the AP (as-prepared) glass is explored. Meanwhile, the microstructure and mechanical properties of the glass-ceramics after heat treatment are also tested in detail. Various experimental methods are used to obtain accurate data. As the content of La2O3 is increased, the glass transition temperature (Tg) of the AP glass is gradually raised. The crystallization peak temperature (TP) is also increased step by step. Heat treatment is applied to the glass samples under appropriate conditions. After the heat treatment, ZrO2 crystals are precipitated in the glass matrix. Cerite-(La) crystals that contain La are also found in the heat-treated glass. These crystals are observed and confirmed by microstructural testing. When the La2O3 content is greater than 4 mol%, the crystallization tendency of the glass is reduced significantly. Glass crystallization is effectively inhibited under this condition, and no obvious crystals are formed. The mechanical properties of the crystallized glass are all improved compared with the base glass. These properties include hardness, elastic modulus, crack initiation resistance, and fracture toughness. All these properties are tested and recorded carefully. When the La2O3 content is increased to 4 mol%, the mechanical properties of both the AP glass and the crystallized glass are enhanced to the optimal level. However, when the La2O3 content exceeds 4 mol%, obvious changes occur. The mechanical properties of the AP glass begin to decline. At the same time, the crystallization amount of the glass is reduced. This reduction in crystallization amount directly leads to a decline in the mechanical properties of the crystallized glass. The excessive La2O3 is considered to damage the network structure of the AP glass, which causes the decline of its properties. |
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