粉末冶金制备22Cr-ODS合金的高温氧化行为研究

High Temperature Oxidation Behavior of 22Cr-ODS Alloy Prepared by Powder Metallurgy

采用粉末冶金热等静压工艺制备了氧化物弥散强化FeCrAl合金,探究在1000℃空气环境中合金的高温氧化行为。通过X射线衍射、扫描电子显微镜等对合金在1000℃氧化不同时间后的氧化层表面成分、物相及截面成分、厚度等进行研究,结果表明:该工艺制备的22Cr-ODS合金在1000℃空气环境中能够形成完整致密的α-Al_(2)O_(3)表面氧化层,氧化10 h、25 h、50 h、100 h、200 h后氧化层厚度分别为0.52μm、0.91μm、1.42μm、1.47μm和1.76μm,合金内部晶粒未发生明显粗化,表明该合金具有良好的高温抗氧化性能和组织稳定性。

The high temperature oxidation behavior of FeCrAl alloy prepared by hot isostatic pressing by powder metallurgy at 1000℃was investigated.The surface and cross-section of the oxide layer after oxidation at 1000℃were studied by Xray diffraction and scanning electron microscope.The results show that the 22Cr-ODS alloy prepared by this process can form a complete and dense surface oxide layer at 1000℃,and the oxide layer is mainly composed ofα-Al_(2)O(3).After 10 h,25 h,50 h,100 h and 200 h of oxidation,the thickness of the oxide layer is about 0.52μm,0.91μm,1.42μm,1.47μm and 1.76μm,respectively.The internal grain size of the alloy did not coarsen significantly during oxidation at 1000℃.The alloy has good high-temperature oxidation resistance and organizational stability during the high-temperature service.