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热喷涂技术:2019,11(3):38-43
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Ta 含量对 NiCoCrAlY 涂层性能的影响
(1.北京航天无人机系统工程研究所;2.北方工业大学 机械与材料工程学院;3.北京矿冶科技集团有限公司)
Effect of Ta on High Temperature Performance of NiCoCrAlY Coatings
(1.Beijing Aerospace Unmanned Vehicles System Engineering Research Institute;2.School of Mechanical and Materials Engineering, North China University of Technology;3.BGRIMM Technology Group)
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中文摘要: 采用真空雾化的方法制备了 Ta 含量为 0、2% 及 5% 的 NiCoCrAlYTa 合金粉末,利用超音速火焰喷涂制备 了三种涂层,研究了 Ta 对合金粉末微观组织及物相的影响,绘制了 1050°C条件下涂层的高温氧化动力学曲线, 研究了 500h 氧化试验后涂层组织和 β 相的分布,初步探讨了 Ta 元素对改善涂层抗氧化性能的作用机理。研究结 果表明:Ta 通过提高 MCrAlY 体系抗氧化元素的溶质浓度,促进了氧化膜的形成,随着 Ta 含量的增加,涂层的 内氧化程度降低,涂层抗氧化性能提高。但含 Ta 涂层在长时间氧化条件下会生成 CrTaO4 、AlTaO4 等尖晶石类 氧化物,且 Ta 的氧化物 PBR 值较大,对涂层的抗热震性能不利。
中文关键词: NiCoCrAlYTa  涂层  高温氧化  抗热震性能
Abstract:The NiCoCrAlYTa alloy powder with a Ta concentration of 0, 2% and 5% was prepared by vacuum atomization. The coatings were prepared on Ni-based superalloy GH536 by HVOF. The effect of Ta element on the structure and phase of the alloy powder was analyzed. The oxidation kinetics curves of NiCoCrAlYTa coating were described. In addition, the coating structure and β phase distribution after 500 hours oxidation is also discussed. The results show that Ta element changes the concentration of antioxidant elements and coating internal oxidation, which improves the oxidation resistance of NiCoCrAlYTa. However, the coating containing Ta will generate spinel oxides such as CrTaO4 and AlTaO4 in the condition of long-term oxidation, and Ta has a large PBR value, which is adverse to the thermal shock resistance of the coating.
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陈建国,张淑婷,杜开平,欧阳佩旋.Ta 含量对 NiCoCrAlY 涂层性能的影响[J].热喷涂技术,2019,11(3):38-43.
Jianguo Chen,Shuting Zhang,Kaiping Du,Peixuan Ouyang.Effect of Ta on High Temperature Performance of NiCoCrAlY Coatings[J].Thermal Spray Technology,201911(3):38-43.

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