【摘要】 利用扫描电镜、X射线衍射仪等研究了一种镍基单晶合金的短时(小于16h)高温氧化行为。结果表明:该合金在900～1 100℃空气中氧化时,随着氧化温度的升高和氧化时间的延长,氧化速率增加;合金在900℃氧化16h后形成的氧化膜不完整,致密性很低,氧化产物主要为Al2O3、NiO、Cr2O3和TiO2的混合物;在1 000℃氧化16h后形成了完整的、致密性较高的Cr2O3和Al2O3氧化膜;在1 100℃氧化16h后,氧化层中生成了块状NiCr2O4尖晶石,局部区域的氧化膜较为疏松,并且伴有部分脱落。更多还原

【Abstract】 Short time(less than 16 h) oxidation behavior of a Ni-based single crystal superalloy at high temperatures was studied by scanning electron microscopy and X-ray diffraction.The results show that the oxidation rate increased with the increase of oxidation temperature and time when the tested alloy was oxidized at 900-1 100 ℃ in air.The oxidation products were comprised of Al2O3,NiO,Cr2O3 and TiO2 after the alloy was oxidized at 900 ℃ for 16 h,and the oxidation film with low compact was incomplete.After the alloy was oxidized at 1 000 ℃ for 16 h,the complete and compact oxidation film of Cr2O3 and Al2O3 was formed.After the alloy was oxidized at 1 100 ℃ for 16 h,the bulk NiCr2O4 with spinelle structure were obtained,and the partial oxidation film was loosener and with part dropping.更多还原