| 引用本文: | 邹世钦,张长瑞,周新贵,等.Cf/SiC复合材料抗氧化涂层的制备及性能.[J].国防科技大学学报,2004,26(4):57-61.[点击复制] |
| ZOU Shiqin,ZHANG Changrui,ZHOU Xingui,et al.A Study of Oxidation Protection Coatings of Cf/SiC Composite[J].Journal of National University of Defense Technology,2004,26(4):57-61[点击复制] |
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| Cf/SiC复合材料抗氧化涂层的制备及性能 |
| 邹世钦, 张长瑞, 周新贵, 曹英斌, 周长城 |
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(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: |
| 在氧化性环境中，高于400℃时碳纤维开始氧化，限制了Cf/SiC复合材料的应用。通过在Cf/SiC复合材料表面制备抗氧化涂层体系，可以有效地保护碳纤维不被氧化。本实验制备了含CVD-SiC粘接层、自愈合功能层和CVD-SiC抗冲蚀层的三层涂层体系，并进行了氧化失重试验。氧化失重试验结果表明，仅有CVD-SiC涂层的试样氧化失重率较大，不能有效地保护材料，而含有自愈合功能层的三层涂层体系的材料试样，在800℃～1200℃的氧化失重率非常小，1000℃下氧化288h的失重率仅为2.3%，弯曲强度仍保持为452.9MPa。同时实验发现，试样在氧化失重试验后，其CVD-SiC涂层的表面形貌有明显改变，这主要是由SiC氧化形成SiO2薄膜所致，并且在1200℃下所生成的SiO2薄膜有表面收缩趋势，具有液相膜的部分特征。 |
| 关键词: 抗氧化涂层 Cf/SiC复合材料 氧化试验 |
| DOI： |
| 投稿日期：2004-02-21 |
| 基金项目:“863”基金资助项目(2002AA305102)；国家部委基金资助项目(41312011002) |
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| A Study of Oxidation Protection Coatings of Cf/SiC Composite |
| ZOU Shiqin, ZHANG Changrui, ZHOU Xingui, CAO Yinbin, ZHOU Changcheng |
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(College of Aerospace and Materials Engineering, National Univ.of Defense Technology, Changsha 410073,China)
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| Abstract: |
| The hindrance which currently precludes the use of Cf/SiC composites is the oxidation of carbon fiber at the temperature higher than 400℃.Therefore,it is necessary to develop coatings capable of protecting Cf/SiC components from oxidation.This coatings consist of three layers,a CVD-SiC bonding layer,a self-sealing active layer by forming glassy phases on exposure to oxygen,and a CVD-SiC erosion resistant layer.Oxidation tests was carried out.The results indicated that the samples with only CVD-SiC coating have much mass loss,and the samples with three layers of coatings including a self-sealing active layer have little mass loss from the temperature of 800℃ to 1200℃.Samples with self-sealing active layer which underwent an oxidation test at 1000℃ in the atmosphere for 288hr suffered only 2.3% mass loss and a residual strength of 452.9MPa.At the same time,CVD-SiC shows various appearance after oxidation at 800℃,1000℃,and 1200℃.The surface formed at 1200℃ has some liquid phase characteristics. |
| Keywords: oxidation protection coatings Cf/SiC composites oxidation test |
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