闫吕英,董志宏,鲍泽斌.化学镀Pt对多弧离子镀NiCoCrAlY涂层高温氧化行为的影响[J].表面技术,2023,52(3):228-236.
YAN Lv-ying,DONG Zhi-hong,BAO Ze-bin.Effect of Electroless Pt Plating on High Temperature Oxidation Behavior of Multi-arc Ion Plated NiCoCrAlY Coating[J].Surface Technology,2023,52(3):228-236
化学镀Pt对多弧离子镀NiCoCrAlY涂层高温氧化行为的影响
Effect of Electroless Pt Plating on High Temperature Oxidation Behavior of Multi-arc Ion Plated NiCoCrAlY Coating
  
DOI:10.16490/j.cnki.issn.1001-3660.2023.03.020
中文关键词:  化学镀Pt  高温氧化  显微组织  NiCoCrAlY涂层  α-Al2O3  多弧离子镀
英文关键词:electroless Pt plating  high temperature oxidation  microstructure  NiCoCrAlY coating  α-Al2O3  multi-arc ion plating
基金项目:中国科学院重点部署项目(ZDRW-CN-2021-2-2);航空发动机及燃气轮机基础科学中心项目(P2021-A-IV-002-001);广东省重点领域研发计划(2019B010936001)
作者单位
闫吕英 中国科学院金属研究所,沈阳 110016;中国科学技术大学,合肥 230026 
董志宏 中国科学院金属研究所,沈阳 110016 
鲍泽斌 中国科学院金属研究所,沈阳 110016 
AuthorInstitution
YAN Lv-ying Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;University of Science and Technology of China, Hefei 230026, China 
DONG Zhi-hong Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 
BAO Ze-bin Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 
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中文摘要:
      目的 改善多弧离子镀NiCoCrAlY涂层的抗高温氧化性能,探究化学镀Pt对NiCoCrAlY涂层高温氧化行为的影响。方法 采用多弧离子镀(M-AIP)技术在第二代镍基单晶高温合金上沉积NiCoCrAlY涂层,然后通过化学镀技术在其表面制备厚度约0.5 μm的Pt镀层,经真空退火处理后获得Pt改性的NiCoCrAlY涂层。通过1 050 ℃恒温氧化和循环氧化试验测试涂层的高温氧化性能,并利用扫描电子显微镜、X射线衍射以及电子探针等手段对涂层物相及元素分布进行分析。结果 经化学镀Pt改性后,NiCoCrAlY涂层恒温氧化20 h的氧化增重由0.78 mg/cm2减小至0.47 mg/cm2,氧化速率常数由6.32×10‒12 g2/(cm4.s)降低为2.16×10‒12 g2/(cm4.s);而循环氧化300次的氧化增重由1.52 mg/cm2减小至1.05 mg/cm2,氧化速率常数由1.93×10‒12 g2/(cm4.s)降低为9.86×10‒13 g2/(cm4.s)。2种涂层在本试验氧化条件下生成的氧化膜均为α-Al2O3,但NiCoCrAlY涂层生成的氧化膜更厚且起伏明显,同时在局部区域向涂层内生长,特别是循环氧化后期氧化膜还发生了局部剥落。化学镀Pt改性后,NiCoCrAlY涂层表面生成的氧化膜明显变薄,且致密、平坦,无开裂和剥落现象,同时氧化膜向涂层内的生长得到了有效抑制。结论 化学镀Pt改性可进一步提高多弧离子镀NiCoCrAlY涂层的抗高温氧化性能。
英文摘要:
      This work aims to improve the oxidation resistance of multi-arc ion plated NiCoCrAlY coatings and explore the effect of electroless Pt plating on the oxidation behavior of NiCoCrAlY coating at high temperature. A 0.5 μm-thick Pt film was prepared on the multi-arc ion plated NiCoCrAlY coating by electroless plating combined with following vacuum annealing treatment. The high temperature oxidation performance of the coatings before and after modification by electroless Pt plating were tested by isothermal temperature oxidation and cyclic oxidation tests at 1 050 ℃ in air, and the phase composition, morphology and element distribution of the coatings were analyzed by means of scanning electron microscopy (SEM), X-ray diffraction (XRD) and electron probe micro-analyzer (EPMA). The results revealed that the NiCoCrAlY coating exhibited a higher oxidation rate in the process of isothermal oxidation for 20 h, and its oxidation weight gain, average thickness of oxide film and oxidation rate constant were 0.78 mg/cm2, 2.31 μm and 6.32×10‒12 g2/(cm4.s), respectively. In contrast, after being modified by electroless Pt plating, the isothermal oxidation rate of the NiCoCrAlY coating was reduced significantly, and its oxidation weight gain, average thickness of oxide film and oxidation rate constant were decreased to 0.47 mg/cm2, 0.83 μm and 2.16×10‒12 g2/(cm4.s), respectively. The modification of electroless Pt plating also effectively improved the cyclic oxidation performance of the NiCoCrAlY coating. After cyclic oxidation for 300 times, the oxidation weight gain was decreased from 1.52 mg/cm2 to 1.05 mg/cm2, the average thickness of oxide film was reduced from about 5.77 μm to 3.62 μm and the oxidation rate constant was decreased from 1.93×10‒12 g2/(cm4.s) to 9.86×10‒13 g2/(cm4.s). The phase composition of the oxide film formed on the NiCoCrAlY coatings before and after modification by electroless Pt plating during the isothermal temperature oxidation and cyclic oxidation were α-Al2O3. However, the α-Al2O3 film formed on the NiCoCrAlY coating under the two oxidation conditions has obvious fluctuations, and also grown into the coating in local areas. It can also be observed that local peeling of the oxide film occurred in the later stage of cyclic oxidation. After modification by electroless Pt plating, the α-Al2O3 film formed on the NiCoCrAlY coating was obviously thinner, with higher compactness and flatness, without cracking and peeling. At the same time, the growth of oxide film into the coating was effectively inhibited. It can be seen that the modification by electroless Pt plating can further improve the high temperature oxidation resistance of the multi-arc ion plated NiCoCrAlY coating. This is mainly due to the following two reasons:(1) The gaps in the NiCoCrAlY coating were effectively filled by electroless Pt plating, which improved the compactness of the coating and inhibited the growth of α-Al2O3 film into the coating. (2) High affinity between Pt element and Al element promoted the rapid diffusion of Al element in the coating to the surface, resulting in the rapid formation of thinner and denser α-Al2O3 film. In short, electroless Pt plating is conducive to further expand the application of multi-arc ion plated NiCoCrAlY coating in the field of high temperature protection.
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