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采用水热电泳沉积法在C/C-SiC复合材料表面制备了Y2Si2O7晶须增强MoSi2复合抗氧化外涂层。采用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对涂层的相组成和显微结构进行了表征。研究了Y2Si2O7晶须对复合涂层显微结构和抗氧化性能的影响。结果表明:Y2Si2O7晶须对复合涂层的显微结构和抗氧化性能有较大的影响。与MoSi2/SiC涂层相比,Y2Si2O7-MoSi2/SiC复合涂层均匀、致密,无显微裂纹。在静态空气氧化过程中,Y2Si2O7晶须有效阻止了外涂层的开裂,提高了涂层的抗氧化性能。该复合涂层试样在1773 K下氧化100 h,失重仅为0.73%,相应的失重速率仅为1.48×10-5g.cm-2.h-1。
The Y2Si2O7 whisker reinforced MoSi2 composite anti-oxidation coating was prepared on the surface of C / C-SiC composites by hydrothermal electrophoretic deposition. The phase composition and microstructure of the coatings were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of Y2Si2O7 whiskers on the microstructure and oxidation resistance of the composite coating were studied. The results show that the Y2Si2O7 whiskers have a great influence on the microstructure and oxidation resistance of the composite coatings. Compared with MoSi2 / SiC coating, Y2Si2O7-MoSi2 / SiC composite coating is uniform, dense and without microcracks. During static air oxidation, Y2Si2O7 whiskers effectively prevent cracking of the overcoat and improve the oxidation resistance of the coating. The composite coating sample was oxidized at 1773 K for 100 h, the weight loss was only 0.73%, and the corresponding weight loss rate was only 1.48 × 10-5g.cm-2.h-1.