航空学报 > 2001, Vol. 22 Issue (1): 73-77

Cr在Ti-Al-Cr合金抗高温氧化过程中的作用研究

周春根, 杨颖, 宫声凯, 徐惠彬   

  1. 北京航空航天大学材料科学与工程系 北京 100083
  • 收稿日期:1999-10-20 修回日期:2000-05-18 出版日期:2001-02-25 发布日期:2001-02-25

MECHANISM OF Cr EFFECT FOR IMPROVEMENT OF OXIDATION RESISTANCE OF Ti-Al-Cr ALLOYS

ZHOU Chun-gen, YANG Ying, GONG Shen-kai, XU Hui-bin   

  1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:1999-10-20 Revised:2000-05-18 Online:2001-02-25 Published:2001-02-25

摘要: 研究了 Ti-50 Al,Ti-50 Al-1 5Cr,Ti-4 5Al-1 5Cr和 Ti-67Al-8Cr(原子百分数 )合金在 90 0~ 1 0 0 0℃下的高温氧化性能。结果表明 :Ti-50 Al-1 5Cr,Ti-4 5Al-1 5Cr和 Ti-67Al-8Cr均表现出优良的抗氧化性能,氧化后表面主要是 α-Al2O3及少量的 TiO2 组成。Ti-50 Al-1 5Cr,Ti-67Al-8Cr和 Ti-4 5Al-1 5Cr合金良好的抗高温氧化性能归于 Cr在合金抗氧化过程中起到了吸氧效应的作用。另外发现对于 Ti-50 Al-1 5Cr和 Ti-67Al-8Cr均发生了 950℃时的氧化增重比 1 0 0 0℃时的氧化增重大,这是由于 Cr的加入使 Ti的活性降低的缘故。

关键词: Ti-Al-Cr, 高温氧化, Cr的作用, TiAl

Abstract: The high temperature oxidized behavior of Ti-50Al, Ti-50Al-15Cr, Ti-45Al-15Cr and Ti-67Al-8Cr(at.%) alloy at 900~1000℃ was studied. The results showed that Ti-50Al-15Cr, Ti-45Al 15Cr and Ti-67Al-8Cr have good oxidation resistance. The weight gain at 950℃ for Ti 50Al 15Cr and Ti 67Al 8Cr is more than that at 1000℃, which is due to a decrease in titanium activity in Ti-Al-Cr alloys when Cr is added into Ti-Al alloys. Oxides formed on the surface of Ti-50Al-15Cr, Ti-45Al-15Cr and Ti-67Al-8Cr after oxidation consist of α Al2O3 and tiny TiO2. The formation of Al2O3 is attributed to the role of Cr. Effect of Cr can be described by ‘gettering effect’.

Key words: T i-A l-Cr, h igh temperature oxidat ion, effect of Cr, T iA l