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利用等离子表面合金化技术,在TiAl基合金表面实现了Cr-Si二元共渗。通过SEM、EDS、XRD检测合金渗层的形貌、合金元素含量与相结构,并研究了合金化处理对TiAl基合金高温抗氧化性能的改善效果。结果表明,合金渗层组成相为Cr3Si及Laves相TiCr2,过渡层物相主要为Al8Cr5与Al3Ti,合金层内Cr、Si元素含量呈梯度分布;经高温氧化后合金渗层表层形成致密CrO2,内层形成连续Al2O3阻隔层,其氧化动力学曲线呈典型的抛物线型。
Using plasma surface alloying technology, Ti-based alloy surface achieved Cr-Si binary permeation. The morphology, the content of alloying elements and the phase structure of the alloy layer were investigated by SEM, EDS and XRD. The effect of alloying treatment on the high temperature oxidation resistance of TiAl-based alloy was also studied. The results show that the phase composition of the alloy is Cr3Si and Laves phase TiCr2, the phase of the transitional layer is mainly Al8Cr5 and Al3Ti, and the contents of Cr and Si in the alloy layer are gradient distribution. The dense CrO2 forms on the surface of the alloy after high temperature oxidation, The formation of continuous Al2O3 barrier layer, the oxidation kinetics curve showed a typical parabolic type.