| Pt改性对NiAl涂层氧化性能及显微组织的影响 |
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| 引用本文： | 韩志勇,卢博文,王仕成. Pt改性对NiAl涂层氧化性能及显微组织的影响[J]. 焊接学报, 2020, 41(9): 44-48. DOI: 10.12073/j.hjxb.20200511005 |
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| 作者姓名： | 韩志勇 卢博文 王仕成 |
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| 作者单位： | 中国民航大学，天津市民用航空器适航与维修重点实验室，天津，300300 |
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| 摘 要： | 使用大气等离子喷涂技术在哈氏合金X基体上制备NiAl涂层，再采用最优工艺在NiAl涂层上电镀Pt并进行真空扩散制备出高性能的Ni-Al-Pt涂层. 对NiAl涂层和Pt改性涂层进行高温氧化试验，观察并分析两种涂层的氧化行为、相成分以及微观组织. 氧化动力学曲线结果显示，与原始涂层相比，Pt改性涂层的氧化动力学曲线更接近抛物线，且氧化后期涂层增重较为缓慢. XRD结果表明，Pt改性涂层氧化初期即可在表面快速形成连续致密的Al2O3膜，氧化至90 h时，涂层表面仍主要为α-Al2O3. SEM结果显示，Pt改性涂层氧化30 min后，涂层表面出现θ-Al2O3和α-Al2O3的混生结构. 氧化35 h后，θ-Al2O3基本转化为连续致密的α-Al2O3. 氧化至90 h时，涂层表面主要由呈片状结构的α-Al2O3和团聚成球的NiO组成，涂层仍具有更高的抗氧化性能.
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| 关 键 词： | Ni-Al-Pt涂层 微观组织 相成分 氧化行为 热生长氧化物 |
| 收稿时间： | 2020-05-11 |
Effect of Pt modification on oxidation properties and microstructure of NiAl coatings |
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| Affiliation: | Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin, 300300, China |
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| Abstract: | NiAl coatings was fabricated on Hastelloy X substrate by atmospheric plasma spraying technique, and Pt was electroplated on NiAl coatings and vacuum diffusion was performed to prepare high performance Ni-Al-Pt coatings. High temperature oxidation tests were carried out on NiAl coatings and Pt modified coatings to observe and analyze the oxidation behavior, phase composition and microstructure of the two coatings. The oxidation kinetic curve results show that, compared with the NiAl coatings, the oxidation kinetics curve of the modified coating is closer to the parabola, and the weight gain in the late oxidation period is slower. XRD results show that the Pt modified coating can quickly form a continuous and dense Al2O3 film on the surface at the initial stage of oxidation. When it is oxidized to 90 h, the coating surface is still mainly α-Al2O3. The SEM results showed that after Pt modified coating oxidation for 30 min, a mixed structure of θ-Al2O3 and α-Al2O3 appeared on the surface of the coating. After the coating was oxidized for 35 h, the θ-Al2O3 basically transformed into continuous and dense α-Al2O3. When the coating is oxidized for 90 h, the coating surface is mainly composed of sheet-like α-Al2O3 and agglomerated NiO, the coating still has higher oxidation resistance. |
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