将C纤维增强不同成分配比的ZrB_2-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ZrB_2-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 oxidation resistance performance of ZrB_2-SiC ceramics was evaluated. The influence of composition and holding time on the oxidation behavior of ZrB_2-SiC multiphase ceramic at 1400℃, as well as the oxidation mechanism and behavior of the multiphase ceramic were studied through static oxidation experiment. Mass gain percent, SEM images and XRD patterns demonstrate that the silica rich glass phase layer was formed on the surface of the multiphase ceramic at the initial stage of oxidation. In addition, the oxidation mechanism changed from reaction controlling to diffusion controlling due to the protective glass layer, which hinders the diffusion of oxygen into the inner part of the ceramic. Besides, the protective effect becomes even more obvious with longer holding time.
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