为了提高燃气轮机热端部件的服役寿命，拓展热端部件的高温防护方法及应用，在某燃气轮机涡轮叶片用DD5镍基单晶高温合金表面制备了CoCrAlY+YSZ，(Ni，Pt)Al+YSZ和Zr改性(Ni，Pt)Al+YSZ 3种热障涂层，对比研究了这3种热障涂层的1 100 ℃循环氧化行为和900 ℃混合盐热腐蚀行为。结果表明：CoCrAlY+YSZ涂层在循环氧化和热腐蚀过程中均发生严重的YSZ陶瓷面层剥落现象，而铝化物+YSZ涂层的陶瓷面层则完好或仅局部极少量剥落；(Ni，Pt)Al涂层经活性元素Zr改性后抗氧化和耐热腐蚀性能均进一步提高，表现为氧化和腐蚀增重降低，内氧化和内硫化现象明显减轻；(Ni，Pt)Al+YSZ涂层和Zr改性(Ni，Pt)Al+YSZ涂层对DD5镍基单晶高温合金叶片均有较好的适用性。

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 turbine. 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 CoCrAlY+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 superalloy blades.

TK221

国家自然科学基金“叶企孙”科学基金（U2241251）；中船集团自立科技项目（202109Z）；创新工程项目（211XXXXN1060104）； 国家自然科学基金面上项目（51671202）；中国科学院重点部署项目（ZDRWCN202122）