摘要
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。
Effect of Al and Co content on oxidation behavior of K4169 superalloy at 950 ℃was investigated by means of TGA,XRD and SEM（EDS）.The results show that the oxidation kinetics obey parabolic law and the oxidation particle sizes of the alloy with different Al and Co content are smaller than that of the alloy with primary composition.With the increasing of Al content the oxidation resistance of the alloy is improved,however,with the increasing of Co content the oxidation resistance of the alloy is weakened.When the content of Al is 1.45 wt% and Co is 0.3 wt%,the oxidation resistance of the alloy is the best,but the alloy with primary composition is the worst.The oxide scales of the alloy with different Al and Co content are all composed of loose top layer consisted of Cr2O3,TiO2 and a bit of NiO and NiCr2O4,compact intermediate layer of Cr2O3,as well as discrete internal oxide layer of Al 2O3.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2011年第6期114-118,共5页
Transactions of Materials and Heat Treatment
基金
甘肃省自然科学基金(3ZS042-B25-028)
