| 浸渍强化对氮化硅组织和性能的影响 |
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| 引用本文： | 徐永东,李德成,张湛.浸渍强化对氮化硅组织和性能的影响[J].航空学报,1992,13(6):286-292. |
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| 作者姓名： | 徐永东 李德成 张湛 |
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| 作者单位： | 西北工业大学403研究室 西安 710072 |
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| 摘 要： | 浸渍强化处理是提高反应烧结氮化硅性能的有效措施。影响浸渍强化效果的主要因素有浸渍剂的品种;多孔坯体的结构特征:以及浸渍剂与氮化硅之间的润湿性能和相互作用关系等。本文通过系统性实验,确定了进行浸渍处理的最佳条件。
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| 关 键 词： | 反应烧结 氮化硅 浸渍强化 |
| 收稿时间： | 1990-06-02 |
| 修稿时间： | 1991-04-14 |
THE INFLUENCE OF INFILTRATION STRENGTHENING ON THE STRUCTURE AND PROPERTIES OF SILICON NITRIDE |
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| Xu Yong-dong. Li De-cheng,Zhang Zhan.THE INFLUENCE OF INFILTRATION STRENGTHENING ON THE STRUCTURE AND PROPERTIES OF SILICON NITRIDE[J].Acta Aeronautica et Astronautica Sinica,1992,13(6):286-292. |
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| Authors: | Xu Yong-dong Li De-cheng Zhang Zhan |
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| Institution: | Faculty 403 of Northwestern Polvtechnical University, Xian, 710072 |
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| Abstract: | Infiltration strengthening is an effective means to improve the mechanical properties of Reaction Bonded Silicon Nitride(RBSN). In this paper, porpous RBSN compacts are infiltrated with three kinds of salt solutions: Re(NO3)yZr(NO3)4and A12(SO4)3. The thermodynamics of infiltration is that the wetting angle is less than 90 The infiltration amount obeys Poiseill Law, After the compacts are infiltrated with Re(NO3)4and Ai2(SO4)3, the fexural strength is increased largely, but Zr(NO3)4decreases the strength. This is because RexOyand Al2O3from the respective decomposition of Re(NO3)yand Al2(SO4)3can promote the sinter of Si3N4powders, decrease the sizes of pores and blunt the tips of cracks. On the contrary ZrO2from Zr(NO3)4enables Si3N4to decompose at high temperature. |
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| Keywords: | reaction bonded silicon nitride (RBSN) infiltration strengthing |
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