| 氮化硅陶瓷的玻璃相及其晶粒异常长大 |
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| 引用本文： | 杨海涛,韩海涛,尚福亮,高玲. 氮化硅陶瓷的玻璃相及其晶粒异常长大[J]. 硬质合金, 2006, 23(4): 212-214 |
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| 作者姓名： | 杨海涛 韩海涛 尚福亮 高玲 |
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| 作者单位： | 1. 深圳大学理学院材料系深圳市特种功能材料重点实验室,广东深圳,518060
2. 武汉理工大学材料复合新技术国家重点实验室,湖北武汉,430070 |
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| 摘 要： | 利用透射电镜(TEM)研究无压烧结Si3N4-MgO-CeO2系陶瓷的显微结构。发现并用微观衍射分析证实了晶界处有玻璃相出现。透射电镜能谱分析得出,当没有MgO时CeO2的主要功能便是形成玻璃相。硅酸铈玻璃相的出现有利于Si3N4液相的产生。MgO-CeO2是Si3N4陶瓷优秀的烧结助剂。当在1850℃以上温度烧结是会出现Si3N4陶瓷晶粒的异常长大,这将导致裂纹和位错并最终影响其机械性能。
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| 关 键 词： | 烧结 显微结构 Si3N4陶瓷 透射电镜 |
| 收稿时间： | 2006-06-27 |
| 修稿时间： | 2006-06-27 |
Grain Boundary Glassy Phase and Abnormal Grain Growth of Silicon Nitride Ceramics |
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| Yang Haitao,Han Haitao,Shang Fuliang,Gao Lin. Grain Boundary Glassy Phase and Abnormal Grain Growth of Silicon Nitride Ceramics[J]. Cemented Carbide, 2006, 23(4): 212-214 |
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| Authors: | Yang Haitao Han Haitao Shang Fuliang Gao Lin |
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| Affiliation: | 1.Shenzhen Key Lab of special functional materials, department of materials school of science, Shenzhen university. Guangdong Shenzhen 518060, China;2.State Key Laboratory o( Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Hubei Wuhan 430070, China |
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| Abstract: | The microstructure of pressureless sintered Si3N4 with MgO-CeO2 additives has been studied by TEM. The grain boundary glassy phase is observed and confirmed directly by microdiffraction. EDAX analysis suggests that the main function of CeO2 lies in the formation of a glass phase, which contains hardly any MgO. This cerium silicate glassy phase is good to wet Si3N4. MgO-CeO2 is an excellent sintering aid for Si3N4. Abnormal grain growth of Si3N4 occurred at a sintering temperature of above 1850℃, which leads to microcracks and dislocations and is harmful to mechanical properties. |
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| Keywords: | sintering microstructure Si3N4 TEM |
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