倪建洋,尹斌,邓春明,杨焜,张留艳,邓畅光.不同厚度薄壁单晶高温合金/PtAl涂层界面演变[J].表面技术,2023,52(1):187-195, 231.
NI Jian-yang,YIN Bin,DENG Chun-ming,YANG Kun,ZHANG Liu-yan,DENG Chang-guang.Interface Evolution of PtAl Coatings/Thin-walled Single Crystal Superalloy with Different Thicknesses[J].Surface Technology,2023,52(1):187-195, 231 |
| 不同厚度薄壁单晶高温合金/PtAl涂层界面演变 |
| Interface Evolution of PtAl Coatings/Thin-walled Single Crystal Superalloy with Different Thicknesses |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.019 |
| 中文关键词: PtAl涂层 薄壁单晶高温合金 不同厚度 元素互扩散 二次反应区 |
| 英文关键词:PtAl coatings thin-walled nickel-based single crystal superalloy different thickness inter-diffusion of elements secondary reaction zone |
| 基金项目:广东省基础与应用基础研究基金项目(2021A1515011693、2020A1515010948);广东省科学院专项项目(2020GDASYL- 20200104028、2021GDASYL-20210103066、2020GDASYL-20200402005);广东省软科学研究计划项目(2019B101001011);广州市重点领域研发计划(202007020008);航空发动机及燃气轮机基础科学中心项目(P2021-A-I-001-001) |
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| Author | Institution |
| NI Jian-yang | School of Materia and Energy, Guangdong University of Technology, Guangzhou 510006, China;National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou 510651, China;Guangdong Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China |
| YIN Bin | National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou 510651, China;Guangdong Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China;Powder Metallurgy Research Institute, Central South University, Changsha 410083, China |
| DENG Chun-ming | National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou 510651, China;Guangdong Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China |
| YANG Kun | National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou 510651, China;Guangdong Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China |
| ZHANG Liu-yan | School of Materia and Energy, Guangdong University of Technology, Guangzhou 510006, China |
| DENG Chang-guang | National Engineering Laboratory for Modern Materials Surface Engineering Technology, Guangzhou 510651, China;Guangdong Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China |
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| 中文摘要: |
| 目的 研究不同厚度薄壁单晶高温合金/PtAl涂层界面演变机制。方法 采用电镀Pt和高温低活度气相渗铝的方法在不同厚度(0.5、1.0、2.0 mm)的第三代镍基单晶高温合金DD9上制备PtAl涂层，进行1 100 ℃恒温氧化试验后，利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和X射线能谱仪(EDS)研究不同厚度薄壁单晶高温合金DD9/PtAl涂层界面元素互扩散及界面组织演变。结果 3种基体厚度的涂层试样恒温氧化100 h，其互扩散区(IDZ)快速增大;恒温氧化500 h，IDZ厚度基本稳定，均约为25 μm;恒温氧化1 000 h，只有0.5 mm基体厚度的涂层试样在IDZ出现TCP相“贫化带”。3种基体厚度的涂层试样在IDZ以下，均形成了二次反应区(SRZ)，其中析出了针状和颗粒状TCP相。恒温氧化100 h，3种基体厚度的涂层试样的SRZ厚度相当，但是500 h和1 000 h后，0.5 mm基体厚度的涂层试样的SRZ厚度显著小于其他2种基体厚度的涂层试样。结论 界面附近Ta元素的富集是SRZ形成的主要原因，W、Re和Ta等难熔元素扩散的差异是引起不同基体厚度的涂层试样IDZ和SRZ形貌/厚度差异的关键因素。 |
| 英文摘要: |
| PtAl coated Ni-based single crystal (SC) superalloys are widely used in the aerospace industry and land-based power generation applications. Interdiffusion between the coating and the underlying substrate inevitably occurs during thermal exposure at high temperatures, which causes considerable deterioration of mechanical properties in the alloy substrate. In order to reduce weight and film cooling, the thickness of single crystal superalloy blades is getting thinner and thinner. However, to the knowledge of the authors, the interface evolution mechanism of PtAl coated thin-walled single crystal superalloy and the effect of the substrate thickness have rarely been reported. In this paper, the mechanism of microstructural evolution of PtAl coated thin-walled Ni-based single crystal superalloy with different thicknesses has been studied. PtAl coatings are prepared on a third generation nickel-based single crystal superalloy DD9 with different thicknesses (0.5 mm, 1.0 mm and 2.0 mm) by electroplating Pt and high temperature and low activity vapor aluminizing. The thickness of the electroplating Pt layer is about 5 μm, and the final thickness of PtAl coating is about 40 μm. The inter-diffusion of elements and the microstructural evolution of the PtAl coated samples with different thicknesses have been studied by XRD, SEM and EDS. The inter-diffusion zone (IDZ) increases rapidly after isothermal oxidation for 100 h. After isothermal oxidation for 500 h, the IDZ thickness of three samples are about 25 μm and keep basically unchanged. However, only the sample with 0.5 mm thickness shows topological close packed (TCP) phase depleted zone in IDZ after isothermal oxidation for 1 000 h. Secondary reaction zone (SRZ) with needle-like and granular TCP phases forms below the IDZ in all the samples. After isothermal oxidation for 100 h, the thickness of SRZ of the three samples are equivalent. Still, after isothermal oxidation for 500 h and 1 000 h, the SRZ thickness of the sample with 0.5 mm thickness is significantly smaller than that of other two samples. Although the obvious inner diffusion of Al from the coating to the substrate has been found, the content of Al in the SRZ is basically unchanged due to that most inwardly diffused Al is absorbed in the IDZ. Microstructural analysis suggests that the enrichment of Ta rather than Al near the interface mainly leads to the formation of SRZ. The difference in diffusion of refractory elements such as W, Re and Ta at the interface is the key factor that causes different morphology/thickness of IDZ and SRZ in the three samples. The coated sample with the minimum thickness is easier to homogenize, and less interdiffusion of refractory elements such as W, Re occurs when the isothermal oxidation time is extended to 500 h, which leads to the minimum SRZ thickness of the sample with 0.5 mm thickness. The inward diffusion of Ta from the substrate to the IDZ has been reduced when the isothermal oxidation time is extended. However, the outward diffusion of Ta from the IDZ to the coating continues due to oxidation consumption. Therefore, the content of Ta has been reduced in the IDZ, resulting in the TCP phase depleted zone in the sample with 0.5 mm thickness. |
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