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以方石英型磷酸铝(C-AlPO4)粉体为原料,异丙醇为溶剂,碘为荷电介质,采用水热电泳沉积方法在涂有SiC涂层的碳纤维增强碳(C/C–SiC)复合材料表面制备了C-AlPO4外涂层。借助X射线衍射和扫描电镜表征了涂层的晶相组成和显微结构。研究了沉积电压对C-AlPO4涂层显微结构的影响,并测试了涂层的抗氧化性能。结果表明:在180～220V范围内,水热沉积电压对涂层的显微结构有较大的影响,220V时制备的涂层致密均匀。涂层的沉积量以及涂层与基体的结合强度随着沉积电压的升高而增加;单位面积沉积量与时间的二次方根之间符合线性关系。与包埋法制备的SiC涂层相比,水热电泳沉积法制备的C-AlPO4涂层具有更好的抗氧化性能,涂层样品在1500℃的空气中氧化37h后质量损失仅为0.53%。
The carbon-carbon reinforced carbon (C / C-SiC) coated with cristobalite-type aluminum phosphate (C-AlPO4) as raw material, isopropanol as solvent and iodine as the charging medium were prepared by hydrothermal electrophoretic deposition The C-AlPO4 overcoat was prepared on the composite surface. The crystal phase composition and microstructure of the coating were characterized by X-ray diffraction and scanning electron microscopy. The effect of deposition voltage on the microstructure of C-AlPO4 coating was investigated and the oxidation resistance of the coating was tested. The results show that the hydrothermal deposition voltage has a great influence on the microstructure of the coating in the range of 180 ~ 220V, and the coating prepared at 220V is dense and uniform. The deposition amount of the coating and the bonding strength between the coating and the substrate increase with the increase of the deposition voltage. The linear relationship between the deposition amount per unit area and the square root of the time is linear. Compared with the SiC coating prepared by embedding method, the C-AlPO4 coating prepared by hydrothermal electrophoretic deposition has better oxidation resistance. The mass loss of the coating sample after being oxidized for 37h in air at 1500 ℃ is only 0.53% .