• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2010, Vol. 46 ›› Issue (20): 86-91.

• 论文 • 上一篇    下一篇

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超音速喷涂粘结层对热障涂层抗氧化性能的影响

董允;任志敏;林晓娉;王志平;丁坤英   

  1. 东北大学秦皇岛分校;河北工业大学材料学院;中国民航大学理学院
  • 发布日期:2010-10-20

Effect of HVOF-sprayed Bond Coat on the Oxidation Resistance of Thermal Barrier Coating

DONG Yun;REN Zhimin;LIN Xiaoping;WANG Zhiping;DING Kunying   

  1. Northeastern University at Qinhuangdao School of Material Science and Engineering, Hebei University of Technology School of Science, Civil Aviation University of China
  • Published:2010-10-20

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摘要： 采用超音速喷涂工艺在Ni基高温合金GH99上制备NiCoCrAlY粘结层，研究超音速火焰喷涂工艺对热障涂层抗氧化性能的影响。结果表明：等离子喷涂粘结层表面存在着大量的尖角和钩状的突出颗粒，而超音速喷涂粘结层表面较为平整，内部黑色氧化物较少。超音速喷涂涂层在氧化15 min后表面生成一层较为致密的颗粒状氧化物。超音速喷涂试样在前40 min氧化增重速率快于等离子喷涂试样，此后变得缓慢，而等离子喷涂试样氧化速率依然较高。超音速喷涂的涂层在氧化300 h后热生长氧化物(Thermally grown oxide, TGO)出现分层，TGO内层组织致密，TGO外层组织存在大量的孔洞和间隙。超音速喷涂工艺使热生长氧化物瞬态氧化阶段时间缩短，稳态氧化阶段时间延长，减少了氧化缺陷的产生，有效地提高了涂层抗高温氧化性能。

关键词: 超音速火焰喷涂, 高温氧化, 热生长氧化物, 热障涂层

Abstract: MCrAlY bond coat is deposited onto GH99 high-temperature alloy by using high velocity oxygen fuel technique. The influence of this technique on the oxidation resistance is studied. The experimental results show that lots of sharp-angled and hooked grains exist on the surface of the APS-bond coat, while the surface of HVOF-MCrAlY is relatively smooth and with less internal black oxide. A layer of compact granular oxide forms on the surface of HVOF-MCrAlY after 15 min oxidation, the weight gain of HVOF sample is faster than that of the APS sample in the first 40min oxidation, then becomes slowly, while the APS sample still has high oxidation rate. HVOF sprayed coating of thermally grown oxide(TGO) appears delamination after 300 hours oxidation, TGO layer close to bond coat has dense organization, TGO layer close to top coat has lots of holes and gaps in it. Due to high velocity oxygen fuel technique, time for TGO coming into steady-state oxidation stage is shortened and the period of steady-state oxidation becomes longer. The high temperature oxidation resistance of coating could be improved obviously.

Key words: High velocity oxygen fuel, High-temperature oxidation, Thermal barrier coating, Thermally grown oxide

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