Study on High Temperature Protection Performance of Thermal Barrier Coating for DD5 Single Crystal Blade
In order to improve the service life of hot-end components of gas turbines and expand the high-temperature protection methods and applications of the hot-end components,three kinds of thermal barrier coatings(TBC),such as CoCrAlY+YSZ,(Ni,Pt)Al+YSZ and Zr-modified(Ni,Pt)Al+YSZ,were prepared on the surface of DD5 nickel-based single crystal superalloy for turbine blades of a gas tur-bine.The cyclic oxidation behavior at 1 100 ℃ and the hot corrosion behavior in mixed salt at 900 ℃ of the above three TBCs were studied in comparison.The results show that the YSZ ceramic layer of the Co-CrAlY+YSZ coating seriously peels off during the process of cyclic oxidation and hot corrosion,while the YSZ ceramic layer of the aluminide+YSZ coating is intact or only slightly peels off;the modification of active element Zr further improves both cyclic oxidation resistance and hot corrosion resistance of the(Ni,Pt)Al coating,as shown by the reduction of weight gain during the oxidation and corrosion process,and the significant reduction of internal oxidation and sulphidation;(Ni,Pt)Al+YSZ coating and Zr modified(Ni,Pt)Al+YSZ coating have good applicability for DD5 nickel-based single crystal superal-loy blades.
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