γ-TiAl金属间化合物合金激光表面合金化改性  

Microstructure and Properties of Laser Surface Alloyed γ-NiCrAl/TiC/Cr_7C_3 Composite Coatings on γ-TiAl Intermetallic Alloy

作　　者：刘秀波[1] 于利根[1] 王华明[1] 

机构地区：[1]北京航空航天大学,北京100083

出　　处：《稀有金属材料与工程》2001年第3期224-227,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(59671050)

摘　　要：以ＮｉＣｒ－ＣｒＣ２混合粉末为原料，对γＴｉＡｌ金属间化合物合金进行激光表面合金化，制得了以γ－ＮｉＣｒＡｌ镍基固溶体为基体、以ＴｉＣ及Ｃｒ７Ｃ３为增强相的复合材料表面改性层，分析了激光表面合金化改性层的组织，并测试了其在滑动磨损试验条件下的耐磨及高温抗氧化性能。试验结果表明，上述激光表面合金化层具有很高的硬度、较高的耐磨性及高温抗氧化性。'In-situ' γ-NiCrAl/TiC/Cr7C3 composite coatings were fabricated on substrate of γ-TiAl intermetallic alloy with NiCr-Cr3C2 alloy powder pre-coatings using laser surface alloying. The effect of constitution of the pre-coating alloy powders on microstructure of the composite coatings was investigated using OM, SEM, XRD and EDS. Wear resistance of the laser treated samples was evaluated under dry sliding wear conditions, and the oxidation resistance was tested at 1 000°C in resistance furnace. The laser surface alloyed γ-NiCrAl/TiC/Cr7C3 composite coatings on γ-TiAl intermetallic alloy have high hardness, good wear and high-temperature oxidation resistances.

关 键 词：金属间化合物γ-TiAl合金 激光表面合金化 耐磨性 抗氧化性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]