不同氧化物对C/C复合材料SiC涂层性能的影响

史小红 李贺军 付前刚 卢锦花 李克智

不同氧化物对C/C复合材料SiC涂层性能的影响

史小红李贺军付前刚卢锦花李克智

西北工业大学超高温复合材料重点实验室炭/炭复合材料工程研究中心|陕西西安 710072

基金项目: 国家自然基金(90716024),111计划(08040),西北工业大学青年科技创新基金(W016216)资助.

详细信息

中图分类号: TB 332
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出版历程
- 收稿日期: 2009-02-02
- 录用日期: 2009-11-05
- 修回日期: 2009-03-04
- 刊出日期: 2009-03-20

Effect of different oxide additives on the properties of a SiC coating on carbon/carbon composites

SHI Xiao-hong

C/C Composites Research Center, Key Laboratory of Ultrahigh Composites, Northwestern Polytechnical University, Xi^’an 710072|China

Funds: National Natural Science Foundation of China ( 90716024), the “111” Project of China (08040 ) and the Scientific and Technological Innovation Foundation of Northwestern Polytechnical University of China for Young People (W016216).

摘要

摘要: 分别以MgO、Al₂O₃和B₂O₃为添加剂，利用包埋法在炭/炭（C/C）复合材料表面制取了单层SiC涂层，并在这三种SiC涂层表面采用相同包埋工艺得到SiC外涂层。研究了这三种氧化物对SiC涂层组织结构及抗氧化性能的影响。通过SEM、EDS和XRD分析表明，以MgO为添加剂得到的单层SiC涂层疏松且含有大量孔洞；以Al₂O₃为添加剂得到的涂层较为致密，但存在部分孔洞；以B₂O₃为添加剂时涂层均匀、致密。在1500℃空气介质中的氧化实验表明，以B₂O₃为添加剂的双层SiC涂层(~200 μm) 可有效保护C/C复合材料200h不被氧化。
- C/C复合材料 /
- SiC /
- 涂层 /
- 氧化物
Abstract: Double-layer SiC-based coatings on carbon/carbon composites were prepared by a wrapping cementation method with different oxides (MgO, Al₂O₃ or B₂O₃) as additives to the inner layer. The phase morphologies and antioxidation properties of the SiC coated carbon/carbon composites were investigated by SEM, EDS and XRD. Results show that the SiC coating with B₂O₃as an additive to the inner layer is more compact than those with MgO or Al₂O₃ as the additive. Different phases exist in the three different inner layer SiC coatings. The double-layer SiC coating modified by B₂O₃ is dense and uniform with few flaws and holes, and can protect carbon/carbon composites from oxidation at 1 500℃ for 200 h in air.
- Carbon/carbon composites /
- SiC /
- Coating /
- Oxides