Research States of Surface Coating Technology of TiAl Alloys

TiA1 alloys are the new type high-temperature structural materials applied for aerospace and air- craft industry because of their low density,high strength and good creep resistance.The problem of poor ductility of these materials at room temperature has been mostly solved by alloying and microstructure controlling.Thus the prob- lems of improving high-temperature oxidation resistance farther and wear resistance have become the most important re- search subjects.Surface coating technology offers a way to solve these problems.The present situation of domestic and foreign researches on surface coating technology of TiAl alloys is reviewed,the laser technique,thermal spraying tech- nique and their applications are mainly introduced.The development trends are also discussed.