粘結層的鋁含量及熱處理對航空發動機熱端部件DZ40M合金上熱障涂層靜態氧化行為的影響

徐偉*，崔俊華，張偉瑞

（1.成都航空職業技術學院，四川 成都 610100；2.南昌航空大學，江西 南昌 330063）

【表面技術】

粘結層的鋁含量及熱處理對航空發動機熱端部件DZ40M合金上熱障涂層靜態氧化行為的影響

徐偉1,*，崔俊華2，張偉瑞1

（1.成都航空職業技術學院，四川 成都 610100；2.南昌航空大學，江西 南昌 330063）

采用超音速火焰噴涂在航空發動機熱端部件DZ40M合金表面制備了鋁含量不同(6%、8%和12%)的Ni–Co基粘結層，再等離子噴涂YSZ(氧化釔穩定氧化鋯)陶瓷面層，制得了熱障涂層。通過掃描電鏡、X射線衍射儀和拉曼光譜儀研究了粘結層成分及其真空熱處理對熱障涂層顯微形貌、物相組成以及界面熱生長氧化物(TGO)的影響。結果表明，3種粘結層的致密性均較高，與基材以及陶瓷層結合較好。3種噴涂態粘結層中的物相組成與原始粉末相似，隨著Al含量增加，原始粉末和噴涂態粘結層中β相的含量逐漸增加。粘結層的真空熱處理可以有效降低3種熱障涂層在靜態氧化過程中TGO的增厚速率。未經粘結層真空熱處理制成的熱障涂層中，TGO的增速與粘結層中Al的含量有關。粘結層真空熱處理后，晶界擴散會顯著影響TGO的增厚速率，TGO晶粒尺寸的增加會造成晶界數量減少，相應地會降低TGO的增厚速率。

航空發動機；熱端部件；熱障涂層；粘結層；熱處理；靜態氧化；顯微結構；熱生長氧化物

Abstract:Ni–Co-based bonding layers with different Al contents (6%, 8% and 12%) were prepared on the surface of DZ40M alloy for hot section component of aeroengine by supersonic flame spraying, and then covered with YSZ (yttriastabilized zirconia) ceramic layers by plasma spraying, forming thermal barrier coatings.The effects of the composition and vacuum heat treatment of bonding layer on the micromorphology, phase composition and thermally grown oxide (TGO) of thermal barrier coating were studied by scanning electron microscope, X-ray diffractometer and Raman spectrometer.The results showed that all the three kinds of bonding layers are compact and well bonded with the substrate and the ceramic layer.The phase compositions of all the as-sprayed bonding layers are similar to the original powders.The contents of beta phase in the as-sprayed bonding layer and in the original powder are gradually increased with the increasing of Al content.Vacuum heat treatment for bonding layer effectively reduces the TGO thickening speed of all the thermal barrier coatings in a static oxidation process.The growth of TGO is related to the content of Al in bonding layer for the thermal barrier coating prepared without vacuum heat treatment of bonding layer.The diffusion at grain boundaries significantly affects the thickening speed of TGO in the thermal barrier coating prepared with vacuum heat treatment of bonding layer.The grain boundaries are reduced with the increasing of the grain size of TGO, resulting in a decrease of TGO thickening speed.

Keywords:aeroengine; hot section component; thermal barrier coating; bonding layer; heat treatment; static oxidation;microstructure; thermally grown oxide

First-author’s address:Chengdu Aeronautic Vocational and Technical College, Chengdu 610100, China

現代航空技術的快速發展對渦輪發動機性能提出了更高的要求，而提升其性能的關鍵取決于航空發動機熱端零部件的耐溫能力、抗氧化性能、熱疲勞強度等。……