4Cl為活化劑，采用包埋法在309不銹鋼上制備了納米CeO2改性鋁化物涂層。采用X射線(xiàn)衍射分析儀、掃描電子顯微鏡和能譜儀對(duì)涂層以及循環(huán)氧化50次后的表面和橫截面進(jìn)行了分析。微觀結(jié)構(gòu)研究表明，改性涂層中包含F(xiàn)e4Al13相，由于基底金屬的向外擴(kuò)散，改性涂層捕獲了少量的CeO2納米顆粒。與不添加CeO2納米顆粒的普通鋁化物涂層相比，在900 ℃的大氣環(huán)境下，分散CeO2改性鋁化物涂層表現(xiàn)出更好的防氧化剝落性能；在50次循環(huán)氧化后，CeO2改性鋁化物涂層上仍然可以發(fā)現(xiàn)一些Fe2Al5相，并存在向外擴(kuò)散的Al層、中間的FeAl層和外部的Fe2Al5+FeAl混合層，這表明CeO2納米顆?？梢匝泳忎X化物涂層的降解。;A CeO2-modified aluminide coating was prepared on 309 stainless steel by pack cementation method with NH4Cl as activator. The surface and cross-section of the coating before and after cyclic-oxidation at 900 °C for 50 cycles were analyzed by X-ray diffractometer and scanning electron microscope coupled with energy dispersive spectroscope. The microstructure analysis results show that the modified coating consists of Fe4Al13 phase. A few CeO2 nanoparticles are entrapped due to the outward diffusion of base metal. Compared with the normal aluminide coating without the addition of CeO2 nanoparticles, the aluminide coating modified by dispersed CeO2 nanoparticles has better scale spallation resistance in air at 900 °C. Some Fe2Al5 phases can be found on CeO2-modified aluminide coating even after 50 cycles of oxidation. Additionally, the outward-diffused Al layer, the intermediate FeAl layer, and the external Fe2Al5+FeAl mixed layer exist in the coating, suggesting that CeO2 nanoparticles can retard the degradation of aluminide coatings."/>