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利用机械研磨渗在TiAl合金表面制备了铝化物涂层。在600℃经过150 min的振动处理后,TiAl合金表面形成了约为30μm的涂层。该涂层均匀致密,Al和Ti元素沿涂层均匀分布。XRD分析表明该涂层的相结构为Al3 Ti相。在900℃下,经过300 h的循环氧化后,该铝化物涂层表面形成了一层连续均匀的Al2 O3膜,表现出良好的抗氧化和抗剥落性能。相比之下,TiAl合金空白样表面形成了分层结构的氧化层,主要由Al2O3和TiO2混合氧化物组成,因此表现出较差的高温性能。
The aluminide coating was prepared by mechanical abrasion on the surface of TiAl alloy. After vibration treatment at 600 ℃ for 150 min, the surface of TiAl alloy formed a coating of about 30μm. The coating is uniform and dense, with uniform distribution of Al and Ti elements along the coating. XRD analysis shows that the phase structure of the coating is Al3 Ti phase. After 300 h of cyclic oxidation at 900 ℃, a continuous layer of Al 2 O 3 film was formed on the surface of the aluminide coating, showing good anti-oxidation and anti-spalling properties. In contrast, TiAl alloy blank-like surface formed a layered oxide layer, mainly composed of Al2O3 and TiO2 mixed oxides, and therefore showed poor high temperature performance.