采用水热电泳沉积法在C/C-SiC复合材料表面制备了Y_2Si_2P_7晶须增强MoSi_2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Y_2Si_2O_7晶须对复合涂层显微结构和抗氧化性能的影响.结果表明:Y_2Si_2O_7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MoSi_2/SiC涂层相比,Y_2Si_2O_7-MoSi_2/SiC复合涂层均匀、致密,无显微裂纹.在静态空气氧化过程中,Y_2Si_2O_7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~(-5)g·cm~(-2)·h~(-1).
Y_2Si_2_O7 whisker-toughened MoSi_2 oxidation resistant coatings were deposited on SiC-C/C composites surface by a hydrothermal electrophoretic deposition process. The phase compositions and microstructures of coatings were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The influences of Y_2Si_2O_7 whisker on the microstructure and oxidation resistance of coatings were particularly investigated. The results show that Y_2Si_2O_7 whisker has a strong influence on the microstructure and oxidation resistant performance of the coated composites. Compared with MoSi_2/SiC coating,Y_2Si_2O_7-MoSi_2/SiC coating exhibits dense, uniform and homogeneous morphologies without any microcracks.Y_2Si_2O_7 whisker can effectively prevent coatings from cracking as a result of improving oxidation resistant performance of the coated composites. The as-prepared multi-layer coating can protect C/C composites from oxidation for 100 h at 1773 K with a mass loss of 0.73%.The corresponding mass loss rate is 1.48×10~(-6)g·cm~(-2)·h~(-1).
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