| La2O3在MgO-Al2O3-SiO2-TiO2微晶玻璃中的作用 |
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| 引用本文： | 迟玉山,沈菊云,陈学贤,缪之训.La2O3在MgO-Al2O3-SiO2-TiO2微晶玻璃中的作用[J].无机材料学报,2002,17(2):348-352. |
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| 作者姓名： | 迟玉山 沈菊云 陈学贤 缪之训 |
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| 作者单位： | 中国科学院上海硅酸盐研究所，上海200050 |
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| 摘 要： | 在MgO-Al2O3-SiO2-TiO2玻璃中添加不同数量的氧化镧，采用差热分析，X射线衍射及电子显微镜等技术研究了氧化镧对玻璃析晶过程与力学性能的影响。氧化镧的加入使玻璃中析出α－堇青石相的温度降低，同时避免了高膨胀方石英相的析出。随着氧化镧加入量的增加，玻璃整体析晶能力下降，微晶玻璃中晶相含量减少，晶粒尺寸增大，微晶玻璃的弹性模量与硬度减小，断裂韧性增加，体现出大尺寸长柱状金红石晶粒的增韧作用。
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| 关 键 词： | MgO－Al2O3－SiO2－TiO2 微晶玻璃 La2O3 晶化 断裂韧性 |
| 文章编号： | 1000-324X(2002)02-0348-05 |
| 收稿时间： | 2001-3-29 |
| 修稿时间： | 2001年3月29日 |
Role of La2O3 in MgO-Al2O3-SiO2-TiO2 Glass-ceramics |
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| CHI Yu-Shan,SHEN Ju-Yun,CHEN Xue-Xian,MIAO Zhi-Xun.Role of La2O3 in MgO-Al2O3-SiO2-TiO2 Glass-ceramics[J].Journal of Inorganic Materials,2002,17(2):348-352. |
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| Authors: | CHI Yu-Shan SHEN Ju-Yun CHEN Xue-Xian MIAO Zhi-Xun |
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| Affiliation: | ShanghaiInstituteofCeramics;ChineseAcademyofSciences;Shanghai200050;China |
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| Abstract: | The crystallization process and mechanical properties of MgO-Al2O3-SiO2-TiO2 glass-ceramics containing La2O3 were studied by means of DTA, XRD, and SEM. With the present of La2O3, a-cordierite phase appears at lower temperature and no cristobalite phase exits. The tendency of bulk crystallization of glass-ceramics is declined by the addition of La2O3, which leads to small crystallinity and large crystal grains. As a result, the elastic modulus and hardness of the glass-ceramics become lower. The fracture roughness of glass-ceramics, however, is raised by the toughening effect of rutile crystalline grains with big length-diameter ratio. |
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| Keywords: | MgO-Al2O3-SiO2-TiO2 glass-ceramics La2O3 crystallization fracture toughness |
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