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Si-B-C陶瓷涂敷2DC/SiC复合材料的抗氧化性能

, PP. 100-106

Keywords: C/SiC,Si-B-C陶瓷,涂层,氧化,形貌,自愈合

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Abstract:

利用化学气相沉积(CVD)法制备了Si-B-C陶瓷涂敷改性的2DC/SiC复合材料,研究了其在700~1200℃氧化10h性能和结构的演变规律以及自愈合机制,同时获得了Si-B-C涂层在不同温度氧化后的形貌、组分和物相转变规律。结果表明:涂敷在复合材料表面的Si-B-C陶瓷随温度的升高氧化加快,但氧化程度较低,不深于7μm;随温度的升高,氧化形成的硅硼玻璃黏度降低,挥发增强;当温度达到1200℃时,硅硼玻璃析出SiO2晶体;Si-B-C陶瓷涂敷改性的C/SiC具有优良的抗氧化性能,随氧化温度的升高,复合材料失重率增加,但在1200℃氧化10h后失重率仅为0.47%;此外材料在1000℃氧化后的强度保持率最高,达到91.6%,Si-B-C陶瓷氧化形成的硅硼玻璃可以有效封填裂纹,这是材料具有优良抗氧化性能的主要机制。

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