| Y-La-Si3N4陶瓷的显微结构分析 |
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| 引用本文： | 陈力%冯坚%李永清%张长瑞.Y-La-Si3N4陶瓷的显微结构分析[J].宇航材料工艺,2003,33(2):39-43. |
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| 作者姓名： | 陈力%冯坚%李永清%张长瑞 |
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| 作者单位： | 1. 华中科技大学材料科学与工程学院,武汉,430074
2. 国防科技大学新型陶瓷纤维及其复合材料国防科技重点实验室,长沙,410073 |
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| 基金项目： | 国防预研重点资助项目:12.4.2.2 |
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| 摘 要： | 通过采用溶液法引入烧结助剂Y2O3、La2O3的工艺，研究了热压自韧Si3N4陶瓷的显微结构特征，着重分析了烧结助剂合量及配比对材料显微结构的影响以及材料的显微组织和力学性能的关系。结果发现，自韧Si3N4陶瓷中β-Si3N4柱状晶的双峰分布特征以及显微组织的均匀性对材料的力学性能起着决定性作用。
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| 关 键 词： | 显微结构 Si3N4陶瓷 柱状晶 双峰分布 显微组织 力学性能 烧结助剂 镧 钇 |
A Study on Microstructure of Y-La-Si3N4 Ceramics |
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| Chen Li Feng Jian Li Yongqing Zhang Changrui.A Study on Microstructure of Y-La-Si3N4 Ceramics[J].Aerospace Materials & Technology,2003,33(2):39-43. |
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| Authors: | Chen Li Feng Jian Li Yongqing Zhang Changrui |
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| Abstract: | The processes of adding Y2O3 and La2O3 in Si3N4 powder as sintering additives by using the solutions of Y(NO)3 and La(NO)3 are reviewed. The microstructure of hot-press self-reinforced Si3N4 is studied in detail with emphasis on the effects of Y2O3 and La2O3 content and ratio on microstructure and mechanical properties of the Si3N4. It has been found that the distinct bimodal grain size distribution and the homogeneity of the B-Si3N4 columnar crystals are crucial to the mechanical properties of Si3N4 ceramics. |
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| Keywords: | Self-reinforced Si3N4 Microstructure Sintering additive Bimodal grain size distribution |
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