NiAl-28Cr-6Mo共晶合金的高温氧化行为

本文采用恒温氧化实验方法,在900～1150℃下测试了NiAl-28Cr-6Mo共晶合金的氧化性能,分析了合金的氧化动力学,SEM观测了合金表面以及横截面的形貌.研究表明,NiAl-28Cr-6Mo共晶合金在900～1100℃下合金表面生成了连续的Al2O3氧化膜,具有较好的抗氧化性能;900～1000℃氧化膜主要由θ...

High Temperature Oxidation Behavior of NiAl-28Cr-6Mo Eutectic Alloy

In this paper,using constant temperature oxidation test method,the oxidation performance of NiAl-28Cr-6Mo eutectic alloy was tested at 900~1150℃,the oxidation kinetics of the alloy was analyzed,and the morphology of the alloy surface and cross section was observed by SEM.Studies have shown that NiAl-28Cr-6Mo eutectic alloy forms a continuous Al2O3 oxide film on the alloy surface at 900~1100℃,with good oxidation resistance;900~1000℃oxide film is mainly composed ofθ-Al2O3 and Cr2O3 Composition,with the increase of constant temperature oxidation temperature,θ-Al2O3and Cr2O3 decrease,α-Al2O3increases,the surface of the oxide film at 1100℃is mainly composed of fine and denseα-Al2O3;during the oxidation process,the surface oxide film exists The phase transition process ofθ-Al2O3→α-Al2O3;the poor protection ofθ-Al2O3 compared toα-Al2O3 leads to the increase of the oxidation of the alloy at 1000℃over 1050℃and 1100℃;the oxide film of the eutectic alloy at 1150℃flakes and does not form The complete Al2O3 oxide film leads to the deterioration of the oxidation resistance of the alloy,and the weight gain of oxidation increases rapidly.