(中国科学院金属腐蚀与防护研究所，金属腐蚀与防护国家重点实验室，沈阳 110015
北京钢铁研究总院，北京100081)
摘 要: 研究了溅射Ti50Al10Cr及Ti50Al20Cr涂层对Ti-24Al-14Nb-3V抗高温氧化性能的影响。结果表明，在800℃下，Ti50Al10Cr及Ti50Al20Cr涂层表面由于可形成粘 附性良好的Al2O3膜，大大改善了Ti-24Al-14Nb-3V的抗高温氧化性能。900℃时在Ti50Al10Cr涂层 表面长出大量TiO2，导致其氧化增重较大；而在Ti50Al20Cr涂层表面生成了连续Al2O3，其抗氧化性能良好。然而，由于TiAlCr涂层与基体热膨胀系数不同，在循环氧化过程中涂层出现一些裂纹，导致其抗循环氧化性能有所下降。
关键字: Ti-24Al-14Nb-3V 高温氧化 TiAlCr涂层
（State Key Laboratory for Corrosion and Protection,Institute of Corrosion and Protection of Metals,The Chinese Academy of Sciences, Shenyang 110015, P. R. China
Central Iron and Steel Research Institute, Beijing 100081,P. R. China）
Abstract:The effect of sputtered Ti50Al10Cr and Ti50Al20Cr coatings on oxidation resistance of Ti-24Al-14Nb-3V in static air at 800～900 ℃ was studied .The uncoated TiAl alloys showed poor resistance due to the formation of porous mixed Al 2 O3+TiO2+AlNbO4 scale. The Ti50Al10Cr and Ti50Al20Cr coatings could remarkably improve the oxidation resistance of Ti-24Al-14Nb-3V due to the formation of protective Al2O3 layer. A great deal of TiO2 appeared on the Ti50Al10Cr coating , which led to great mass gain at high temperatures. Both coatings cracked during cyclic oxidation due to the difference of thermal expansion coefficients between the TiAlCr coatings and the substrate.
Key words: Ti-24Al-14Nb-3V high temperature oxidation TiAlCr coatings
