金属热处理 ›› 2020, Vol. 45 ›› Issue (12): 47-52.DOI: 10.13251/j.issn.0254-6051.2020.12.009

• 工艺研究 • 上一篇    下一篇

真空热处理对APS-NiCoCrAlY+APS-YSZ热障涂层热循环寿命的影响

薛文利, 陆涛, 黄佳华, 郭德亮   

  1. 中国航发上海商用航空发动机制造有限责任公司, 上海 201306
  • 收稿日期:2020-07-15 出版日期:2020-12-25 发布日期:2021-01-14
  • 通讯作者: 陆 涛,博士,工程师,E-mail: tao.t.lu@hotmail.com
  • 作者简介:薛文利(1985—),男,工程师,主要研究方向为航空发动机金属热处理,E-mail: xuewenli@ymail.com。
  • 基金资助:
    上海市科学技术委员会科研计划(18511108600)

Effect of vacuum heat treatment on thermal cycling life of APS-NiCoCrAlY+APS-YSZ thermal barrier coating

Xue Wenli, Lu Tao, Huang Jiahua, Guo Deliang   

  1. AECC Shanghai Commercial Aircraft Engine Manufacturing Co., Ltd., Shanghai 201306, China
  • Received:2020-07-15 Online:2020-12-25 Published:2021-01-14

摘要: 通过大气等离子喷涂在HA188合金基材上制备NiCoCrAlY+YSZ热障涂层,然后分别对试样在高真空和低真空中进行1080 ℃的热处理。通过在1100 ℃对热处理前后的热障涂层进行热循环考核,并在具备EDS的扫描电镜下分析了热循环前后的显微组织和成分。结果表明,真空热处理显著提高了APS-NiCoCrAlY+APS-YSZ热障涂层的热循环寿命,一方面是由于真空热处理后在APS-NiCoCrAlY/APS-YSZ界面上形成连续的TGO层受到了抑制,降低了由TGO产生的应力开裂,另一方面真空热处理后的涂层热循环时在APS-NiCoCrAlY的内部产生了更多的氧化物,在一定程度上降低了APS-NiCoCrAlY的热膨胀系数,减少了由APS-NiCoCrAlY/APS-YSZ热膨胀系数不匹配造成的应力开裂。并且低真空热处理的涂层内部失效裂纹没有像高真空热处理的涂层那样均匀连续扩展。

关键词: 真空热处理, 热障涂层, 热循环寿命

Abstract: NiCoCrAlY+YSZ Coatings were deposited on HA188 alloy by using air plasma spray technique, some of which were subsequently heat treated at 1080 ℃ under low and high vacuum respectively. The 1100 ℃ thermal cycling tests were carried out on as-sprayed and heat-treated specimens, the microstructure and composition of specimens were studied before and after thermal cycling test by using SEM with EDS. The results show that after the vacuum heat treatment, the thermal cycling life is significantly improved, which thanks to continuous TGO layer growth between APS-NiCoCrAlY/APS-YSZ interface inhibited during thermal cycling, therefore, the cracking tensile stress induced by TGO is reduced. In addition, more oxides are found in vacuum heat treated APS-NiCoCrAlY after thermal cycling test, to some extent, which reduces the thermal expansion coefficient of APS-NiCoCrAlY, leading to reduction of cracking strain originated from thermal expansion mismatch. The failure cracks in low vacuum heat treated specimens don't continuously propagate as that in high vacuum heat treatment.

Key words: vacuum heat treatment, thermal barrier coating, thermal cycling life

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