论文部分内容阅读
利用热重分析法、X射线衍射、扫描电镜和能谱分析研究了Al和Co含量对K4169高温合金950℃高温氧化行为的影响,结果表明:合金氧化动力学符合抛物线规律;添加Al和Co的合金氧化产物颗粒比原始成分合金的细小;Al含量的增加增强了合金的高温抗氧化能力,而Co含量的增加降低了合金的高温抗氧化性能。当Al含量为1.45 wt%、Co含量为0.3 wt%时,合金的高温抗氧化性能最好,而原始成分合金的高温抗氧化性能最差。不同Al、Co含量K4169合金氧化膜都分为3层:外层主要是疏松的Cr2O3和TiO2的混合层,还含有少量的NiO和NiCr2O4尖晶石相;中间层是Cr2O3保护层;内氧化物层是Al2O3。
The effects of Al and Co contents on the oxidation behavior of K4169 superalloy at 950 ℃ were investigated by means of TG, XRD, SEM and EDS. The results showed that the oxidation kinetics of the alloy was in accordance with the parabolic law. The addition of Al and Co The alloy oxide particles are smaller than the original alloy. The increase of Al content enhances the high temperature oxidation resistance of the alloy, while the increase of Co content decreases the high temperature oxidation resistance of the alloy. When the content of Al is 1.45 wt% and the content of Co is 0.3 wt%, the high temperature oxidation resistance of the alloy is the best, while the oxidation resistance of the original alloy is the worst. Different Al, Co content K4169 alloy oxide film is divided into three layers: the outer layer is mainly a mixture of loose Cr2O3 and TiO2, and also contains a small amount of NiO and NiCr2O4 spinel phase; the middle layer is Cr2O3 protective layer; the inner oxide The layer is Al2O3.