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中国腐蚀与防护学报  2019, Vol. 39 Issue (1): 77-82    DOI: 10.11902/1005.4537.2018.005
  研究报告 本期目录 | 过刊浏览 |
激光重熔YSZ热障涂层950 ℃的热腐蚀行为
虞礼嘉,梁文萍(),林浩,缪强,黄彪子,崔世宇
1. 南京航空航天大学材料科学与技术学院 南京 211100
Evaluation of Hot Corrosion Behavior of Laser As-remelted YSZ Thermal Barrier Coatings at 950 ℃
Lijia YU,Wenping LIANG(),Hao LIN,Qiang MIAO,Biaozi HUANG,Shiyu CUI
1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China
全文: PDF(8679 KB)   HTML
摘要: 

研究了等离子喷涂热障涂层 (TBCs) 和激光重熔热障涂层在75%Na2SO4+25%NaCl (质量分数) 熔盐中不同时间下的热腐蚀性能。通过SEM和XRD分析了热腐蚀后两种热障涂层表面和截面的微观形貌和物相组成。结果表明,未经过激光重熔的涂层在前50 h的热腐蚀过程中重量增加;在后续腐蚀过程中重量减小,100 h时腐蚀减重达到了6.8 mg/cm2,同时出现了涂层剥落的现象;表面物相分析检测到ZrO2和Y2(SO4)3相。激光重熔热障涂层在热腐蚀过程中重量一直在增加;后期阶段趋于平缓,100 h时腐蚀增重为3.7 mg/cm2;表面物相分析仅检测到ZrO2相。激光重熔改善了热障涂层的抗热腐蚀性能。

关键词 热障涂层等离子喷涂激光重熔热腐蚀镍基高温合金    
Abstract

The thermal barrier coating (TBC) of ZrO2-7%Y2O3 (mass fraction) was firstly prepared on high temperature alloy GH4169 and then remelted via CO2 laser glazing technique. The hot corrosion behavior of the ordinary and the laser as-remelted TBCs are assessed in 75%Na2SO4+25%NaCl (mass fraction) molten salt for different time. The morphologies and phase composition of the two TBCs were characterized by means of scanning electron microscope and X-Ray Diffractometer. The results indicated that the ordinary TBC experienced mass gain in the first period of 50 h, hereafter, mass loss in the rest period of test. The total mass loss was about 6.8 mg/cm2 after 100 h test. In the meanwhile spallation of the top surface of the coating did occur and phases of ZrO2 and Y2(SO4)3 could be detected by XRD on the coating surface. The mass gain versus time curve for the laser remelted TBC rose up gradually in the first stage, and then turned to be stable in the later stage. The total mass gain reached about 3.7 mg/cm2 after 100 h test. It is noted that only ZrO2 phase could be detected on the coating surface. It illustrated that the hot corrosion resistance of the TBCs has been further improved by laser remelted technique.

Key wordsthermal barrier coating    plasma-spraying    laser remelted    hot corrosion    Nickel-based superalloy
收稿日期: 2018-01-08     
ZTFLH:  TG174.4  
基金资助:国家自然科学基金(514741431);江苏高校优势学科建设工程
通讯作者: 梁文萍     E-mail: wpliang@nuaa.edu.cn
Corresponding author: Wenping LIANG     E-mail: wpliang@nuaa.edu.cn
作者简介: 虞礼嘉,男,1992年生,硕士生

引用本文:

虞礼嘉,梁文萍,林浩,缪强,黄彪子,崔世宇. 激光重熔YSZ热障涂层950 ℃的热腐蚀行为[J]. 中国腐蚀与防护学报, 2019, 39(1): 77-82.
Lijia YU, Wenping LIANG, Hao LIN, Qiang MIAO, Biaozi HUANG, Shiyu CUI. Evaluation of Hot Corrosion Behavior of Laser As-remelted YSZ Thermal Barrier Coatings at 950 ℃. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 77-82.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.005      或      https://www.jcscp.org/CN/Y2019/V39/I1/77

Process parameterBonding layerCeramic layer
Thickness / μm90~100180~200
Voltage / V6575
Current / A500510
Spray distance / mm110110
Spray speed / mm·s-1600600
ArPowder flow / L·min-16550
H2Powder flow / L·min-166
N2Powder flow / L·min-11515
Power speed / g·min-15015
表1  等离子喷涂热障涂层工艺参数
图1  两种热障涂层表面微观形貌
图2  两种热障涂层热腐蚀动力学曲线
图3  两种热障涂层热腐蚀不同时间后表面的XRD谱
图4  喷涂态热障涂层热腐蚀不同时间后的表面微观形貌
图5  激光重熔热障涂层热腐蚀不同时间后的表面微观形貌
图6  两种热障涂层热腐蚀100 h后的截面微观形貌
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