摘要
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%。
Cristobalite aluminum phosphate （C-AlPO4） coatings were deposited on the surface of carbon fiber reinforced carbon （C/C） with SiC coating （C/C-SiC） composite by a hydrothermal electrophoretic deposition process using C-AlPO4 powder, isopropanol and siodine as raw materials, and solvent and charging agent, respectively. The phase compositions and microstructures of the as-prepared multi-coatings were characterized by X-ray diffraction and scanning electron microscopy. The influences of deposition voltage on the microstructures of the C-AIPO4 coatings were investigated. The oxidation resistance property of the C-AlPO4 coatings was tested. The results show that the deposition voltage plays an important role in improving the microstructure of the C-AlPO4 coatings. The C-AIPO4 coating prepared at 220 V is compact, and that prepared at 180-200V is uniform. The deposition amount of the C-AlPO4 coatings and the bonding strength between the C-AlPO4 coatings and C/C-SiC composites increase with the increase of deposition voltage. The deposition mass per unit area of the coatings is linear with the square root of the deposition time. Compared with the SiC coating prepared by the pack cementation method, the C-A1PO4 coatings have better oxidation resistance. The mass loss of as-prepared multi-coatings on C/C-SiC composite is only 0.53% after oxidation at 1 500℃ for 37 h in air.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第8期1316-1321,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金50772063
教育部博士点基金20070708001
陕西省自然科学基金SJ08–ZT05
教育部新世纪优秀人才支持计划基金NECT–06–0893
陕西科技大学研究生创新基金资助项目
关键词
磷酸铝
水热电泳沉积
涂层
抗氧化性能
aluminum phosphate
hydrothermal electrophoretic deposition
coatings
oxidation resistance property
