摘要
研究了渗铝、Ｃｏ３０Ｃｒ６Ａｌ０．５Ｙ（质量分数，％）和反应溅射Ａｌ２Ｏ３及Ｔｉ５０Ａｌ１０Ｃｒ（摩尔分数，％）涂层对ＴｉＡｌ金属间化合物在９００和１０００℃的循环氧化性能的影响。结果表明：几种涂层均不同程度地提高了ＴｉＡｌ的抗循环氧化性能，其中ＴｉＡｌＣｒ涂层表现出最好的效果。渗铝涂层内出现大量贯穿性裂纹；ＣｏＣｒＡｌＹ涂层和基体之间存在严重的互扩散，形成的孔洞已连成了较大的裂纹，且涂层内出现裂纹；Ａｌ２Ｏ３膜易开裂剥落，提高ＴｉＡｌ的抗循环氧化性能十分有限；而ＴｉＡｌＣｒ涂层表现出好的涂层基材相容性，循环氧化后涂层内没有出现裂纹，涂层－基材结合致密。
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1期56-60,共5页
The Chinese Journal of Nonferrous Metals
基金
国家杰出青年基金
国家"八六三"计划资助项目
