粘结层的铝含量及热处理对航空发动机热端部件DZ40M合金上热障涂层静态氧化行为的影响

发布时间：2018-12-30 13:13

【摘要】：采用超音速火焰喷涂在航空发动机热端部件DZ40M合金表面制备了铝含量不同(6%、8%和12%)的Ni-Co基粘结层,再等离子喷涂YSZ(氧化钇稳定氧化锆)陶瓷面层,制得了热障涂层。通过扫描电镜、X射线衍射仪和拉曼光谱仪研究了粘结层成分及其真空热处理对热障涂层显微形貌、物相组成以及界面热生长氧化物(TGO)的影响。结果表明,3种粘结层的致密性均较高,与基材以及陶瓷层结合较好。3种喷涂态粘结层中的物相组成与原始粉末相似,随着Al含量增加,原始粉末和喷涂态粘结层中β相的含量逐渐增加。粘结层的真空热处理可以有效降低3种热障涂层在静态氧化过程中TGO的增厚速率。未经粘结层真空热处理制成的热障涂层中,TGO的增速与粘结层中Al的含量有关。粘结层真空热处理后,晶界扩散会显著影响TGO的增厚速率,TGO晶粒尺寸的增加会造成晶界数量减少,相应地会降低TGO的增厚速率。
[Abstract]:Ni-Co based bonding layer with different aluminum content (6% and 12%) was prepared on the surface of DZ40M alloy by supersonic flame spraying, and then plasma sprayed YSZ (yttrium stabilized zirconia) ceramic surface layer. The thermal barrier coating was prepared. The effects of bonding layer composition and vacuum heat treatment on the microstructure, phase composition and interface thermal growth oxide (TGO) of thermal barrier coatings were investigated by SEM, XRD and Raman spectroscopy. The results show that the three kinds of bonding coatings have higher densification and better bonding with the substrate and ceramic coating. The phase composition of the three sprayed coatings is similar to that of the original powder, and the content of Al increases with the increase of the content of Al. The content of 尾 phase in the original powder and sprayed adhesive layer increased gradually. Vacuum heat treatment of bonding layer can effectively reduce the thickening rate of TGO during static oxidation of three kinds of thermal barrier coatings. The growth rate of TGO is related to the content of Al in the adhesive layer. After vacuum heat treatment of bonding layer, grain boundary diffusion will significantly affect the thickening rate of TGO, and the increase of TGO grain size will reduce the number of grain boundaries and correspondingly decrease the thickening rate of TGO.
【作者单位】：成都航空职业技术学院;南昌航空大学;
【分类号】：TG174.4

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