溅射TiAlCr涂层对Ti-24Al-14Nb-3V 抗氧化性能的影响

来源期刊：中国有色金属学报1999年第2期

论文作者：关春红 王福会 唐兆麟 吴维tao 李世琼

文章页码：247 - 252

关键词：Ti-24Al-14Nb-3V 高温氧化 TiAlCr涂层

Key words：Ti-24Al-14Nb-3V ; high temperature oxidation ; TiAlCr coatings

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。

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.