强流脉冲电子束辐照对NiCoCrAlY涂层结构和性能的影响
Irradiation effect of high current pulsed electron beam on surface structure and mechanical properties of NiCoCrAlY
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摘要: 采用低气压等离子体喷涂在DZ4镍基高温合金表面沉积NiCoCrAlY 涂层，并利用强流脉冲电子束（HCPEB）对其进行辐照处理。对HCPEB辐照处理前后的涂层的结构和性能分析得出，经HCPEB辐照处理后，疏松的涂层表面重熔，变得致密平整，产生微区光滑、熔坑和裂纹。X射线衍射分析表明，电子束辐照后涂层中的γ′相增多，涂层没有产生明显的残余微观内应力。900 ℃静态空气等温氧化试验结果显示，HCPEB辐照处理后，涂层的抗氧化性能明显提高。原因在于电子束辐照处理的涂层氧化后表面形成了更加完整的Al2O3保护层，同时γ′相的增加也有利于其耐氧化性能的提高。
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关键词:
- NiCoCrAlY涂层 /
- 强流脉冲电子束 /
- 辐照处理 /
- 表面改性 /
- 高温氧化
Abstract: DZ4 substrates were coated with NiCoCrAlY by plasma spray and subsequently treated by high current pulsed electron beams(HCPEB) of different parameters. The surface microstructure, phase structure and high temperature oxidation resistance were studied. It has been shown that as a result of the HCPEB treatment the loose and rough structure remelted and the surface became smooth. Smooth microregion, craters and cracks appeared on the surface. The γ′ phase manifolded and there was no visible thermal stress. The oxidation test at 900 ℃ for 100 h showed that a more compact and successive α-Al2O3 scale was formed on the surface of the samples after HCPEB irradiation, which improved the oxidation resistance of the NiCoCrAlY coatings obviously. -
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