摘要
研究了Ｔｉ５０Ａｌ，Ｔｉ４５Ａｌ１０Ｃｒ和Ｔｉ５０Ａｌ１０Ｃｒ（％）合金在９００～１１００℃下的抗循环氧化性能。结果表明，ＴｉＡｌ在９００～１１００℃下形成ＴｉＯ２和Ａｌ２Ｏ３的混合氧化物膜，抗循环氧化能力差。在９００℃时Ｔｉ４５Ａｌ１０Ｃｒ合金尽管形成ＴｉＯ２和Ａｌ２Ｏ３的混合氧化物膜，但是循环氧化１００次仍未见氧化膜剥落；而在１０００℃时由于粘附性好的Ａｌ２Ｏ３膜部分覆盖于表面，其抗氧化性能较ＴｉＡｌ的好。在１１００℃氧化时，Ｔｉ４５Ａｌ１０Ｃｒ合金能形成连续Ａｌ２Ｏ３膜，而表现出好的抗循环氧化性能。Ｔｉ５０Ａｌ１０Ｃｒ合金在９００～１１００℃由于能形成保护性的Ａｌ２Ｏ３膜，而表现出好的抗循环氧化能力。因此，添加Ｃｒ可以促进ＴｉＡｌ表面粘附性好的Ａｌ２Ｏ３膜的形成从而显著地提高ＴｉＡｌ的抗循环氧化能力。
The cyclic oxidation behavior of Ti50Al, Ti45Al10Cr and Ti50Al10Cr (%) alloys at 900～1 100 ℃ was investigated. The results showed that Cr improved the cyclic oxidation resistance of TiAl effectively. TiAl exhibited poor cyclic oxidation resistance due to the formation of TiO2+Al2O3 complex scale at 900 ℃～1 100 ℃. At 900 ℃, Ti45Al10Cr alloy formed TiO2+Al2O3 complex scales similar to that of TiAl, but no spallation of scale occurrs. At 1 000 ℃, Al2O3 scale partially covers the alloy surface, so the alloy had better oxidation resistance than TiAl. At 1 100 ℃, Ti45Al10Cr alloy formed a protective Al2O3 scale, and exhibited an excellent cyclic oxidation resistance. Moreover, Ti50Al10Cr alloy exhibited an excellent cyclic oxidation resistance at 900～1 100 ℃ due to the formation of a protective Al2O3 scale.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1998年第2期245-249,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金
国家杰出青年基金
"八六三"高技术计划资助项目
