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通过静态增重法对一种镍基单晶高温合金在900℃和1000℃的恒温氧化行为进行了测定,并利用X射线衍射和扫描电镜对氧化产物进行了分析。结果表明,该合金在900℃和1000℃均为完全抗氧化级,900℃的氧化速率明显低于1000℃的氧化速率。合金的氧化产物以(Ni,Co)O为主,并形成了较多的α-Al_2O_3和较少量的Cr_2O_3,同时形成了CrTaO_4及(Ni,Co)Al_2O_4和Co(Al,Cr)_2O_4等尖晶石氧化物。氧化物呈层状分布,(Ni,Co)O在最外层,而Al_2O_3在内层。另外,在靠近α-Al_2O_3层的合金基体中出现了内氮化物。
The oxidation behavior of a nickel base single crystal superalloy at 900 ℃ and 1000 ℃ was investigated by static weighting method. The oxidation products were analyzed by X-ray diffraction and scanning electron microscopy. The results show that the alloy is fully oxidation resistant at 900 ℃ and 1000 ℃, and the oxidation rate at 900 ℃ is obviously lower than that at 1000 ℃. The oxidation products of the alloys mainly consist of (Ni, Co) O and form more α-Al_2O_3 and smaller amount of Cr_2O_3, while CrTaO_4, (Ni, Co) Al_2O_4 and Co (Al, Cr) Spinel oxide. Oxides are layered, with (Ni, Co) O on the outermost layer and Al 2 O 3 on the inner layer. In addition, nitrides appear in the alloy matrix near the α-Al_2O_3 layer.