(中國科學(xué)院金屬腐蝕與防護研究所，金屬腐蝕與防護國家重點實驗室，沈陽 110015
北京鋼鐵研究總院，北京100081)
摘 要: 研究了濺射Ti50Al10Cr及Ti50Al20Cr涂層對Ti-24Al-14Nb-3V抗高溫氧化性能的影響。結(jié)果表明，在800℃下，Ti50Al10Cr及Ti50Al20Cr涂層表面由于可形成粘 附性良好的Al2O3膜，大大改善了Ti-24Al-14Nb-3V的抗高溫氧化性能。900℃時在Ti50Al10Cr涂層 表面長出大量TiO2，導(dǎo)致其氧化增重較大；而在Ti50Al20Cr涂層表面生成了連續(xù)Al2O3，其抗氧化性能良好。然而，由于TiAlCr涂層與基體熱膨脹系數(shù)不同，在循環(huán)氧化過程中涂層出現(xiàn)一些裂紋，導(dǎo)致其抗循環(huán)氧化性能有所下降。
關(guān)鍵字: Ti-24Al-14Nb-3V 高溫氧化 TiAlCr涂層
（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
