任当精,唐旭,李雷,张一凡,江旭东,许征兵,曾建民.异质双丝超音速电弧喷涂涂层的高温氧化行为和机理研究[J].表面技术,2024,53(4):77-88.
REN Dangjing,TANG Xu,LI Lei,ZHANG Yifan,JIANG Xudong,XU Zhengbing,ZENG Jianmin.High-temperature Oxidation Behavior and Mechanism of Hybrid Twin-wire Supersonic Arc Sprayed Coatings[J].Surface Technology,2024,53(4):77-88 |
| 异质双丝超音速电弧喷涂涂层的高温氧化行为和机理研究 |
| High-temperature Oxidation Behavior and Mechanism of Hybrid Twin-wire Supersonic Arc Sprayed Coatings |
| 投稿时间：2022-12-27 修订日期：2023-03-09 |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.04.007 |
| 中文关键词: 异质双丝 超音速电弧喷涂 铁基涂层 动力学分析 抗高温氧化性能 |
| 英文关键词:hybrid twin-wires supersonic arc spraying Fe-based coatings kinetics analysis high-temperature oxidation resistance |
| 基金项目:国家自然科学基金(51961008);广西自然科学基金(2020GXNSFAA297269) |
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| Author | Institution |
| REN Dangjing | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China |
| TANG Xu | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China |
| LI Lei | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China |
| ZHANG Yifan | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China |
| JIANG Xudong | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China |
| XU Zhengbing | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China;Key Laboratory of High-Performance Structural Materials and Thermo-Surface Processing, Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, China;Centre of Ecological Collaborative Innovation for Aluminum Industry in Guangxi, Nanning 530004, China |
| ZENG Jianmin | State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, Nanning 530004, China;Key Laboratory of High-Performance Structural Materials and Thermo-Surface Processing, Education Department of Guangxi Zhuang Autonomous Region, Nanning 530004, China;Centre of Ecological Collaborative Innovation for Aluminum Industry in Guangxi, Nanning 530004, China |
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| 中文摘要: |
| 目的 采用异质双丝和同质双丝制备3种超音速电弧喷涂铁基涂层，对比研究3种防护涂层在700 ℃下的抗高温氧化性能。方法 采用光学显微镜(OM)、扫描电镜(SEM)、能谱仪(EDS)和X射线衍射仪(XRD)对在700 ℃高温氧化前后涂层的微观结构、表面形貌和化学成分以及物相组成进行表征和分析。采用Matlab软件对涂层的孔隙率进行测定，采用显微硬度计测量涂层的显微硬度。结果 制备得到的3种涂层的孔隙率均低于10%，满足电弧喷涂的要求。3种涂层的显微硬度均达到了400HV以上，其中FeAlCrMoVC/FeAlNiMoCrC涂层的孔隙率最低、显微硬度最高，分别为5.00%和456.91HV。在700 ℃循环氧化下，FeAlCrMoVC、FeAlNiMoCrC和FeAlCrMoVC/FeAlNiMoCrC涂层的单位面积氧化增重分别为10.67、3.32和2.02 mg/cm2。它们的氧化动力学符合经典的抛物线规律，抛物线速率常数(kp)分别为3.08×10−10、2.20×10−11和5.60×10−12 g2.cm−4.s−1。从高温氧化后涂层的扫描电镜图观察到，异质双丝法制备的涂层表面氧化膜主要由3种致密形貌组成，结合EDS和XRD分析，推断它们主要由Fe3O4、Fe2O3、Cr2O3和Al2O3以及尖晶石结构的NiCr2O4组成。截面分析发现，异质双丝制备的FeAlCrMoVC/FeAlNiMoCrC涂层的内氧化和表面氧化膜厚度最小，分别约为5.3、24.7和118.2 μm。结论 涂层的内氧化从孔隙和氧化夹杂物等缺陷开始，而生成的致密氧化物能够提高涂层的抗氧化性。超音速电弧喷涂制备的3种涂层都具有良好的抗高温氧化性能，而异质双丝法制备的FeAlMoCrC/FeAlNiMoCrVC涂层的抗高温氧化性能更好。 |
| 英文摘要: |
| Because of its low cost, easy operation, and high deposition efficiency, supersonic arc spraying technology is extensively used in the field of preparation and repair of protective coatings. Hybrid twin-wire arc spraying technology is a process that employs two kinds of metal wires with distinct compositions to prepare composite coatings. Nonetheless, little research has been conducted on the high-temperature oxidation resistance of iron-based coatings made with the hybrid twin-wire method. The work aims to adopt two kinds of wire materials with similar but different components to solve the problem of the large difference in melting point of hybrid twin-wire arc spraying. Three kinds of ultrasonic arc-sprayed iron-based coatings were prepared on 45 steel substrates by hybrid and homogeneous twin-wires. The microstructure, surface morphology, chemical composition and phase composition of the coatings before and after high-temperature oxidation at 700 ℃ were characterized by optical microscope (OM), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), and X-ray diffraction (XRD). The porosity of the coatings was measured by Matlab software, and the microhardness of the coatings was measured by a microhardness tester. The porosity of the three coatings was all lower than 10%, which could meet the requirements of arc spraying. The microhardness of the three coatings reached above 400HV, among which the hybird FeAlCrMoVC/FeAlNiMoCrC composite coating had the lowest porosity of 5.00% and the highest microhardness of 456.91HV. The high-temperature oxidation results showed that the mass gain/area of FeAlCrMoVC, FeAlNiMoCrC, and FeAlCrMoVC/FeAlNiMoCrC coatings reached 10.67, 3.32 and 2.02 mg/cm2, respectively. Notably, the oxidation kinetics of the three coatings conformed to the classical parabolic law, and the parabolic rate constants (kp) were 3.08×10−10, 2.20×10−11 and 5.60×10−12 g2.cm−4.s−1, respectively. According to the scanning electron microscopy (SEM) images after high-temperature oxidation, compared with the coating prepared by homogeneous twin-wires, the coating prepared through hybrid twin-wire was mainly composed of three dense morphologies. Combined with EDS and XRD analysis, it was inferred that they were primarily composed of Fe3O4, Fe2O3, Cr2O3, and Al2O3, and spinel NiCr2O4. Cross-section analysis demonstrated that the FeAlCrMoVC/FeAlNiMoCrC composite coating made by homogeneous twin-wires showed the thinnest internal oxidation and surface oxidation films of 5.3 μm, 24.7 μm and 118.2 μm. EDS element mapping results showed that oxygen and aluminum in the coating aggregated and overlapped with each other in the pores, which indicated that the internal oxidation mainly generated dense aluminum oxides. In addition, the internal oxidation of the coating started from defects including pores and oxidation inclusions, and the dense oxides generated could enhance the oxidation resistance of the coating. Three kinds of coatings prepared by supersonic arc spraying have good high-temperature oxidation resistance, while the FeAlMoCrC/FeAlNiMoCrVC composite coatings prepared by hybrid twin-wire method exhibit much better high-temperature oxidation resistance. This indicates that the supersonic arc spraying coating prepared by hybrid twin-wire method is the alternative way to improve the oxidation resistance in high temperature. |
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