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使用液相Al-Si合金对TiAl基合金进行表面渗Si处理,可明显增强TiAl基合金的高温抗氧化性,经1273 K,100 h的恒温氧化后,不同的表面涂层使合金在40—100 h之间的氧化速率降低了2个数量级,恒温氧化100 h后的最终氧化皮脱落量也减少3个数量级,液相渗Si使TiAl基合金表面高温抗氧化性能得到大幅度改善,其根本原因是Si与TiAl中的元素Ti结合,降低了Ti的活度,相对增强了涂层中元素Al的活度,而且涂层中Al的绝对含量也得到明显提高,这些均抑制了高温氧化过程中TiO_2的生成,涂层最外层形成了致密的Al_2O_3氧化膜。
The use of liquid phase Al-Si alloy TiAl-based alloy surface infiltration of Si, TiAl-based alloys can significantly enhance the high temperature oxidation resistance, after 1273 K, 100 h of constant temperature oxidation, the different surface coating alloy 40- The oxidation rate decreased by two orders of magnitude between 100 h and 100 h, respectively, and the amount of final scale shedding decreased by three orders of magnitude. The liquid phase infiltration of Si resulted in a significant improvement of the high temperature oxidation resistance of TiAl-based alloy. The reason is that Si combines with element Ti in TiAl to reduce the activity of Ti, relatively increase the activity of elemental Al in the coating, and the absolute content of Al in the coating is also obviously improved, which all inhibit the high temperature oxidation process In the formation of TiO 2, the outermost layer of the coating formed a dense Al 2 O 3 oxide film.