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.使用扫描电镜(SEM)、能谱(EDS)和X衍射仪(XRD)检测了合金渗层的形貌、合金元素含量与相组成,并研究了合金化处理对TiAl基合金高温抗氧化性能与高温耐磨性能的改善效果.结果显示,合金渗层组成相为Cr3Si及Laves相TiCr2,过渡层物相主要为Al8 Cr5与Al3 Ti,合金层内Cr,Si元素含量呈梯度分布.经高温氧化,合金渗层表层形成致密CrO2,内层形成连续Al2 O3阻隔层,其氧化动力学曲线呈现典型的抛物线型.较之原始TiAl基合金摩擦学特性,Cr-Si合金渗层的磨粒磨损程度降低极大,氧化磨损受到抑制,其相对耐磨性能提高了17.3倍.
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