TiAlCr涂层对TiAl金属间化合物抗熔融硫酸盐热腐蚀的影响

Effects of sputtered TiAlCr coatings on hot corrosion resistance of TiAl intermetallics in molten sulphate

研究了溅射ＴｉＡｌＣｒ 涂层对ＴｉＡｌ 金属间化合物抗硫酸盐热腐蚀性能的影响。结果表明，８５０ ℃时，９０ ％ Ｎａ２ＳＯ４ ＋ １０ ％ Ｋ２ＳＯ４ 中Ｔｉ５０Ａｌ 和Ｔｉ２４Ａｌ１４Ｎｂ３Ｖ 都遭受严重热腐蚀。ＴｉＡｌＣｒ 涂层能大大改善ＴｉＡｌ 金属间化合物的抗热腐蚀性能。带Ｔｉ５０Ａｌ１０Ｃｒ 涂层的Ｔｉ５０Ａｌ 表面形成一层完整致密的Ａｌ２Ｏ３ 膜， 涂层与基材之间无明显互扩散。带Ｔｉ５０Ａｌ１０Ｃｒ 涂层的Ｔｉ２４Ａｌ１４Ｎｂ３Ｖ 表面虽然也形成Ａｌ２Ｏ３ 膜， 但在其上面长出一些ＴｉＯ２ 瘤。这可能是涂层与基材之间的互扩散导致涂层中Ｔｉ 含量增加，Ａｌ 含量减少而生成ＴｉＯ２ 的结果。将涂层成分调整为Ｔｉ５０Ａｌ２０Ｃｒ 后， 带Ｔｉ５０Ａｌ２０Ｃｒ 涂层的Ｔｉ２４Ａｌ１４Ｎｂ３Ｖ 表面生成了连续的Ａｌ２Ｏ３ 膜， 其抗热腐蚀性能良好。

The effects of sputtered TiAlCr coatings on hot corrosion resistance of TiAl intermetallics was investigated in molten sulphate at 850 ℃. Both TiAl and Ti 24Al 14Nb 3V suffered severe hot corrosion. The TiAlCr coatings remarkably improved the hot corrosion resistance due to the formation of protective Al 2O 3 scale. A uniform Al 2O 3 scale formed on the surface of Ti50Al with Ti50Al10Cr coating and there was no obvious interdiffusion between Ti50Al and Ti50Al10Cr coating. The interdiffusion between TiAlCr coatings and substrate led to a great deal of TiO 2 appearing on the Ti50Al10Cr coating. The effects of sputtered TiAlCr coatings on hot corrosion resistance of TiAl intermetallics was investigated in molten sulphate at 850 ℃. Both TiAl and Ti 24Al 14Nb 3V suffered severe hot corrosion. The TiAlCr coatings remarkably improved the hot corrosion resistance due to the formation of protective Al 2O 3 scale. A uniform Al 2O 3 scale formed on the surface of Ti50Al with Ti50Al10Cr coating and there was no obvious interdiffusion between Ti50Al and Ti50Al10Cr coating. The interdiffusion between TiAlCr coatings and substrate led to a great deal of TiO 2 appearing on the Ti50Al10Cr coating.