等离子表面Cr-Si合金化改善TiAl基合金高温抗氧化性能的研究  

Improvement of High-temperature Oxidation Resistance of TiAl-based Alloy by Cr-Si Plasma Surface Alloying

作　　者：李亚非 张平则[1] 许浩 

机构地区：[1]南京航空航天大学材料科学与技术学院,江苏南京211106 [2]中航工业中南传动机械厂军品分厂,湖南长沙410200

出　　处：《稀有金属与硬质合金》2012年第2期36-40,共5页Rare Metals and Cemented Carbides

基　　金：江苏省自然科学基金资助项目(BK2005128)

摘　　要：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。Cr-Si was permeated into the surface of TiAl-based alloy by plasma surface alloying.Morphology,alloy element content and phase composition of the alloyed layer were characterized by SEM,EDS and XRD.Effects of surface alloying on high-temperature oxidation resistance of TiAl-based alloy were investigated.The results show that the alloyed layer is composed of Cr3Si and TiCr2 Laves phase.The main phases in the transition layer are Al8Cr5 and Al3Ti.Cr and Si concentration of the alloyed layer is of gradient distribution.The alloying surface layer is covered with dense CrO2 after high temperature oxidation,and the inner layer is a continuous Al2O3 barrier.The oxidation kinetics curve of the alloyed layer show a typical parabola.

关 键 词：TIAL基合金 等离子表面技术 Cr-Si合金化 高温抗氧化性能 

分 类 号：TG174.445[金属学及工艺—金属表面处理]