为提高碳/碳复合材料在高温下的氧化防护性能,利用包埋技术在碳/碳复合材料表面制备了TaSi2/SiC复合涂层.通过XRD、SEM和EDS分析了涂层的晶相结构和形貌特征,在1773 K的空气介质中对TaSi2/SiC涂层碳/碳复合材料进行等温氧化实验.结果表明,复合涂层厚度为200 μm,涂层中含有SiC,Si和TaSi2相,并且涂层中没有明显裂纹出现.EDS结果显示外层TaSi2相可有效地填充内层SiC涂层的空隙,使得内外两层涂层之间没有明显的界面,等温氧化实验曲线说明TaSi2/SiC复合涂层在1773 K的空气介质中可有效保护碳/碳复合材料233 h.
In order to improve the oxidation protective property of carbon/carbon composites at high temperature, TaSi2 coating was prepared on the surface of SiC coated carbon/carbon composites by pack cementation technique. The crystal structure and morphology of the as-obtained coating was analyzed by XRD and SEM with EDS. The isothermal oxidation test was carried out in air at 1773 K. The results show that the as-prepared coating is composed of SiC, Si and TaSi2. The multilayer coating is about 200μm in thickness, and there are no cracks in it. The results of EDS indicate that TaSi2 can effectively fill the holes of SiC coating.There is no visible interface between the TaSi2 outer coating and the SiC inner coating. The isothermal oxidation curve of the TaSi2/SiC coated carbon/carbon composites reveals that the coating can effectively protect carbon/carbon composites for 233 h at 1773 K.
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