MoSi2/SiC HIGH TEMPERATURE ANTI-OXIDATION COMPOUND COATING ON CARBON/CARBON COMPOSITES AND ITS ANTI-OXIDATION BEHAVIOUR
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摘要: 采用两段式包埋法和封闭处理的复合新工艺制得抗氧化性优良的MoSi2/SiC复合梯度C/C复合材料高温抗氧化涂层。涂层由内至外结构为:SiC过渡层→SiC致密层→MoSi2/SiC双相层→以MoSi2为主的外层。对未封闭处理的涂层,制备过程中高温保温时间长的氧化失重少,1200℃、1300℃空气中氧化失重比1400℃、1500℃氧化失重大。用正硅酸四乙酯对涂层表面进行封闭处理,凝胶形成的SiO2可充填涂层表面裂纹并覆盖在涂层表面。在1500℃空气中氧化一定时间后,未封闭处理的涂层试样表现为氧化失重;封闭处理后的试样为氧化增重,氧化52h仍然只有1.28%的增重,封闭处理使涂层的抗氧化性能明显改善。Abstract: The high temperature anti-oxidation compound gradient MoSi2/SiC coating on carbon/carbon composites was prepared by a new complex process of two-stage holding temperature burying and sealing.The suitable gradient framework of the coating is SiC transiting layer,SiC compacting layer,MoSi2/SiC double phase layer and outer layer containing mainly MoSi2 from the inner to the outer of the coating.The oxidation mass loss rate of the unsealed coating prepared for longer holding time at the high temperature stage is less.The oxidation mass loss rates of the unsealed coating at 1200℃ and 1300℃ are larger than those at 1400℃ and 1500℃ in air.The surface of the coating is sealed with Si ( OC2H5 ) 4, and the formed SiO2 in gel fills the cracks and covers the coating.Oxidated at 1500℃ in air for a given time, the specimen with unsealed coating loses the mass,and the specimen with sealed coating gains the mass.The mass gain of sealed coating is 1.28% after oxidation at 1500℃ in air for 52 hours.The sealing improves the anti-oxidation of the coating greatly.
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Keywords:
- carbon/carbon composites /
- anti-oxidation coating /
- MoSi2 /
- SiC /
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期刊类型引用(6)
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