【摘要】 为了研究Y2O3薄膜处理对1Cr13合金的高温氧化行为的影响,采用电沉积-热解法在1Cr13合金表面制备了Y2O3薄膜,并研究了薄膜处理后合金在800℃空气中的氧化动力学曲线,并进行了SEM及XRD分析。经100h循环氧化后沉积薄膜试样表面生成了晶体状的氧化铬,氧化增重和氧化膜剥落量显著下降,分别为空白试样的0.39和0.11。沉积薄膜的作用在于在氧化初期为氧化膜提供了优先形核的位置,改变了氧化铬中的传输机制和应力状态,促进了合金的选择氧化,生成了保护性的氧化膜。因此,Y2O3薄膜处理能显著提高1Cr13合金的抗高温氧化性能。更多还原

【Abstract】 Y2O3 film was prepared on 1Cr13 alloy by electrodepositing and sintering.The effect of Y2O3 deposition film on the oxidation behavior of 1Cr13 alloy at elevated temperature was investigated.Thus the oxidation kinetic curve of the steel coated with Y2O3 film at 800 ℃ in air for a duration of 100 h was measured,while the morphology and microstructure of the oxidized layer were analyzed by means of scanning electron microscopy and X-ray diffraction.Results showed that Cr2O3 crystals were formed on the surface of 1Cr13 alloy after 1 h-cyclic oxidation,leading to significant decrease in the oxidation mass gain and oxidation spalling as well.Namely,the mass gain and spallation loss were only 0.39 and 0.11 of that of the untreated sample.It was supposed that Y2O3 film was able to provide predominant nucleation sites for Cr2O3,leading to change in the diffusion mechanism and stress state of Cr2O3 scales and enhancing selective oxidation and formation of protective oxide scales.This could largely account for the considerably increased high-temperature oxidation resistance of 1Cr13 alloy by Y2O3 film.更多还原