激光重熔YSZ热障涂层950 ℃的热腐蚀行为

doi:10.11902/1005.4537.2018.005

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

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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 words： thermal 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

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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

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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