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带气膜冷却孔热障涂层的氧化机理研究
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1.北京理工大学,北京 100081;2.北京理工大学重庆创新中心,重庆 401120;3.中国航发北京航空材料研究院,北京 100095;4.北京星航机电装备有限公司,北京 100074

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TG174.453

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Oxidation Mechanism of Thermal Barrier Coatings with Air-Film Cooling Holes
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Affiliation:

1.Beijing Institute of Technology, Beijing 100081, China;2.Beijing Institute of Technology Chongqing Innovation Center, Chongqing 401120, China;3.AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;4.Beijing Xinghang Electro-mechanical Equipment Co., Ltd, Beijing 100074, China

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    摘要:

    针对目前带气膜冷却孔热障涂层中氧化机理不明确的问题,本工作利用飞秒激光加工热障涂层气膜冷却孔,观察了气膜冷却孔的微观形貌,对带孔热障涂层进行1000和1150 ℃条件下的静态氧化研究。带孔涂层经1000 ℃静态氧化实验后,热生长氧化物(thermally grown oxide,TGO)生长速率常数为0.372 μm2·h-1,随着氧化时间的延长,TGO厚度先快速增加,后缓慢增加;经1150 ℃静态氧化实验后,带孔涂层TGO生长速率常数为1.26 μm2·h-1,略大于无孔涂层,氧化100 h后,陶瓷层和粘结层界面处的TGO厚度为11.610 μm,与无孔涂层接近。研究结果表明,随着氧化温度的提高,带孔涂层陶瓷层和粘结层界面处的TGO生长速率显著提升,氧化进程加快。相同氧化温度条件下,气膜孔在短时氧化过程中加快了TGO的生长速率,对于TGO在100 h氧化后的厚度影响不大。

    Abstract:

    Aiming to explore the oxidation mechanism of thermal barrier coatings with air-film cooling holes, in this research, femtosecond laser was used to prepare the thermal barrier coatings with air-film cooling holes. The microscopic morphology of the air-film cooling holes was observed, and the static oxidation of the perforated thermal barrier coatings was studied at 1000 and 1150 ℃. The growth rate constant of thermally grown oxide (TGO) of the perforated coating is 0.372 μm2·h-1 after the static oxidation at 1000 ℃. The thickness of TGO is increased rapidly and then slowly with the prolongation of the oxidation time. After the static oxidation at 1150 ℃, the growth rate constant of TGO of the perforated coating is 1.26 μm2·h-1, which is slightly larger than that of the unprocessed coating. After oxidation for 100 h, the thickness of TGO at the interface of the ceramic layer and the bonding layer is 11.610 μm, which is close to that of the unprocessed coating. The results show that the growth rate of TGO at the interface of the ceramic layer and the bonding layer is significantly increased and the oxidation process is accelerated with the increase in oxidation temperature. At the same oxidation temperature, the air-film cooling holes accelerate the growth rate of TGO during the short-time oxidation process, which has little effect on the thickness of TGO after oxidation for 100 h.

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高超,王森源,刘玲,马壮,杨茗佳.带气膜冷却孔热障涂层的氧化机理研究[J].稀有金属材料与工程,2025,54(1):191~201.[Gao Chao, Wang Senyuan, Liu Ling, Ma Zhuang, Yang Mingjia. Oxidation Mechanism of Thermal Barrier Coatings with Air-Film Cooling Holes[J]. Rare Metal Materials and Engineering,2025,54(1):191~201.]
DOI:10.12442/j. issn.1002-185X.20240432

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历史
  • 收稿日期:2024-07-16
  • 最后修改日期:2024-09-14
  • 录用日期:2024-09-30
  • 在线发布日期: 2025-01-24
  • 出版日期: 2025-01-20