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为提高C/C复合材料的抗氧化性能,采用包埋法和低压化学气相法制备了SiC/SiO2涂层。借助XRD、SEM和EDS等测试手段分析了复合涂层的微观结构,并研究了其在1 273、1 773 K静态空气中的抗氧化性能。结果表明,包埋法制备的SiC涂层具有一定的浓度梯度。低压化学气相法制备的非晶SiO2外涂层则有效地封堵了SiC内涂层的的裂纹和孔洞,并解决了SiC涂层在中温区(1 073～1 473 K)无法形成完整SiO2膜的问题。在1 273、1 773 K静态空气中经10 h氧化后,涂层试样的质量损失率分别仅有4.97和0.36 mg/cm2,表现出良好的抗氧化性能。
In order to improve the oxidation resistance of C / C composites, SiC / SiO2 coatings were prepared by embedding method and low pressure chemical vapor deposition. The microstructure of the composite coating was analyzed by means of XRD, SEM and EDS. The oxidation resistance of the composite coating in 1 273,1 773 K static air was also studied. The results show that SiC coating prepared by embedding method has a certain concentration gradient. The low-pressure chemical vapor deposition of amorphous SiO2 coating effectively blocked the SiC inner coating cracks and holes and solved the SiC coating in the temperature zone (1073 ~ 1473K) can not form a complete SiO2 film The problem. After being oxidized in 1 273,1 773 K static air for 10 h, the mass loss rates of the coated samples were only 4.97 and 0.36 mg / cm2, respectively, showing good oxidation resistance.