Evaluation of Hot Corrosion Behavior of Laser As-remelted YSZ Thermal Barrier Coatings at 950 ℃

doi:10.11902/1005.4537.2018.005

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (1): 77-82 DOI: 10.11902/1005.4537.2018.005

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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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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

Received: 08 January 2018

ZTFLH:

TG174.4

Fund: Supported by National Natural Science Foundation of China(514741431);Priority Academic Program Development of Jiangsu Higher Education Institutions

Corresponding Authors: Wenping LIANG E-mail: wpliang@nuaa.edu.cn

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	Lijia YU
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	Qiang MIAO
	Biaozi HUANG
	Shiyu CUI

Cite this article:

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.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.005 OR https://www.jcscp.org/EN/Y2019/V39/I1/77

Table 1 Plasma spraying parameters

Fig.1 Surface morphologies of as-sprayed TBC (a) and laser as-remelted TBC (b)

Fig.2 Hot corrosion dynamics of two thermal barrier coatings

Fig.3 XRD patterns of as-sprayed TBC (a) and as-remelted TBC (b) after hot corrosion for different time

Fig.4 Surface morphologies of as-sprayed TBC after hot corrosion for 10 h (a), 40 h (b) and 100 h (c)

Fig.5 Surface morphologies of laser as-remelted TBC after hot corrosion for 10 h (a), 40 h (b) and 100 h (c)

Fig.6 Cross-sectional morphologies of as-sprayed TBC (a) and laser as-remelted TBC (b) after 100 h hot corrosion

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