| 引用本文: | 刘静宇,蔡清裕,张术华.冲击波活化热压烧结氮化硅粉末.[J].国防科技大学学报,2000,22(3):65-69.[点击复制] |
| LIU Jingyu,CAI Qingyu,ZHANG Shuhua.Shock Activation and Hot-Press Sintering of Si3N4 Powder[J].Journal of National University of Defense Technology,2000,22(3):65-69[点击复制] |
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| 冲击波活化热压烧结氮化硅粉末 |
| 刘静宇1, 蔡清裕2, 张术华3 |
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(1.长沙大学理化系, 湖南 长沙 410003;2.国防科技大学 理学院，湖南 长沙 410073;3.国防科技大学 航天与材料工程学院, 湖南 长沙 410073)
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| 摘要: |
| 对Si3N4 粉末实现了三种不同压力的冲击波预先处理, 而后采用三种不同的热压烧结条件制得Si3N4 陶瓷。运用SEM, TEM, HRTEM 和XRD 等手段分析了粉末和陶瓷的结构特性, 同时测试了材料的性能。结果表明: 冲击波压力没有导致Si3N4 粉末的相变, TEM 观察表明Si3N4 晶粒中有大量的位错及位错群, 冲击波的作用主要是通过引入大量位错和其他缺陷促进致密化过程, 提高陶瓷材料的机械性能。经过40GPa 冲击波活化1800℃ 热压烧结的Si3N4 陶瓷性能最好, 弯曲强度达1107.2 MPa, 断裂韧性达12.20 MPa.m1/2。 |
| 关键词: 冲击波活化 Si3N4 烧结 结构 性能 |
| DOI： |
| 投稿日期：1999-09-01 |
| 基金项目: |
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| Shock Activation and Hot-Press Sintering of Si3N4 Powder |
| LIU Jingyu1, CAI Qingyu2, ZHANG Shuhua3 |
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(1.Department of Physics and Chemistry of Changsha University, Changsha 410003, China;2.College of Science，National Univ. of Defense Technology，Changsha 410073，China;3.College of Aerospace and Materials Engineering, National Univ. of Defense Technology, Changsha 410073, China)
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| Abstract: |
| Si3N4 powders have been pre-treated by shock activating and hot-pressed into Si3N4 ceramics. Three kinds of shock pressure, and three different sintering temperatures are used in the experiments, SEM, TEM and X-ray Diffraction have been used to analysis the structure of the Si3N4 powders and ceramics. The properties of Si3N4 ceramic have been tested. The results show that shock activation give positive action to the densification of Si3N4 powder and the increase of properties of the Si3N4 ceramics; the ceramic parts shocked under 40 GPa and sintered under 1800℃ have the best properties. The bend strength reaches 1107.2 MPa, at the same time, the fracture toughness reaches 12. 20MPa.m1/2. |
| Keywords: shock-activation silicon nitride sintering structure properties |
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