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将C纤维增强不同成分配比的ZrB2-SiC复相陶瓷在1400℃下进行静态抗氧化实验,研究了成分配比及氧化时间对材料氧化过程的影响。通过分析氧化后材料的氧化增重率、氧化试样的背散射电子照片,研究氧化过程中ZrB2-SiC陶瓷微观结构的变化,在此基础上探讨该温度下材料氧化的微观机制。结果表明,氧化初期形成的玻璃相在试样表面形成了一层有效的保护层,这层氧化膜保护层使得该复相陶瓷的氧化机制由反应控制向扩散控制转变,并阻止了材料内部被进一步氧化,且随氧化时间的延长这种保护作用更为明显。
The static oxidation experiment of ZrB2-SiC multiphase ceramics reinforced with C fiber reinforced with different components was carried out at 1400 ℃. The effect of composition ratio and oxidation time on the oxidation process was investigated. The microstructure of the ZrB2-SiC ceramics during oxidation was investigated by analyzing the oxidation rate of oxidation and the backscattered electron photographs of the oxidized samples. The microscopic mechanism of the oxidation at this temperature was also discussed. The results show that the glass phase formed at the initial stage of oxidation forms an effective protective layer on the surface of the sample. The protective layer of the oxide film makes the oxidation mechanism of the multi-phase ceramic change from reaction control to diffusion control, Further oxidation, and with the oxidation of the extension of this protective effect is more obvious.