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采用自行研制的高频电脉冲沉积 (HFESD)设备在Fe2 0Cr4.5Al合金表面分别制备了Fe2 0Cr4.5Al微晶涂层与Fe2 0Cr4.5Al-Y2 O3 弥散氧化物微晶涂层 .在 10 0 0℃和 110 0℃静态空气中 ,对合金基体和施加涂层试样进行了2 0 0h的恒温氧化实验 .结果表明 :在两种实验温度条件下 ,含有Y2 O3 弥散氧化物颗粒的微晶涂层 ,完全消除了Al2 O3 氧化膜中的凸脊 ,细化了氧化膜的晶粒 ,抑制了氧化膜的剥落 ,大大地提高了氧化膜的致密性和粘附性 .单一的微晶涂层则部分抑制了凸脊状氧化膜的形成 ,氧化膜由脊状氧化物和细晶氧化物混杂组成 .涂层对氧化增重的影响则与氧化温度 -氧化膜的生长速率有关 ,在 10 0 0℃下 ,涂层试样的氧化增重均有所降低 ,其中弥散氧化物微晶涂层试样的氧化增重最低 ;在 110 0℃下 ,施加微晶涂层和弥散氧化物涂层对氧化增重影响很小 .微晶和Y2 O3 弥散氧化物颗粒在提高Al2 O3 氧化膜保护性方面具有“协同效应” .
Fe2 0Cr4.5Al microcrystalline coating and Fe2 0Cr4.5Al-Y2O3 disperse oxide microcrystalline coating were prepared on the surface of Fe2 0Cr4.5Al alloy by using HFESD equipment. At 0 ℃ and 110 ℃ in static air, the alloy substrate and the coated samples were subjected to a constant temperature oxidation test for 200h. The results show that at two experimental temperatures, the crystallites containing Y2O3 dispersed oxide particles The coating completely eliminates the ridges in the Al 2 O 3 oxide film and refines the grain of the oxide film, inhibits the flaking of the oxide film and greatly improves the compactness and adhesion of the oxide film. Layer partially suppresses the formation of ridge-shaped oxide film, the oxide film by the ridge oxide and fine crystalline oxide mixed composition.The effect of the coating on the oxidation of weight gain and oxidation temperature - the growth rate of the oxide film, at 10 At 0 ° C, the oxidation weight gain of the coated samples was decreased, and the oxidation weight gain of the samples coated with the dispersed oxide was the lowest. At 110 ° C, the coating of the microcrystalline coating and the dispersion oxide coating Layer has little effect on the weight gain of oxidation. Microcrystalline and Y2 O3 dispersed oxide particles Improve Al2 O3 protective oxide film having terms “synergistic effect.”