Research Progress on Hot Corrosion of Rare Earth Oxides Co-doped ZrO2 Ceramic Coatings in Molten Na2SO4+NaVO3 Salts

doi:10.11902/1005.4537.2018.132

Journal of Chinese Society for Corrosion and protection

2019, Vol. 39

Issue (4): 291-298 DOI: 10.11902/1005.4537.2018.132

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Research Progress on Hot Corrosion of Rare Earth Oxides Co-doped ZrO₂ Ceramic Coatings in Molten Na₂SO₄+NaVO₃ Salts

CHEN Chao¹,LIANG Yanfen¹,LIANG Tianquan^1,²(

),MAN Quanyan¹,LUO Yidong¹,ZHANG Xiuhai^1,²,ZENG Jianmin^1,²

1. School of Resources, Environment and Materials, Guangxi University, Nanning 530004, China
2. Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Materials, Guangxi University, Nanning 530004, China

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Abstract

The doping effect of single, binary and ternary rare earth oxides respectively on the hot corrosion resistance of ZrO₂ ceramic coatings in molten Na₂SO₄+NaVO₃ salts was systematically summarized and discussed in this paper. The hot corrosion behavior of the top ceramic coating, thermal grown oxide scale and bond coat of the TBCs in molten Na₂SO₄+NaVO₃ and the relevant hot corrosion mechanisms were summarized. The research direction of improving the hot corrosion resistance of ZrO₂ceramic coating against the Na₂SO₄+NaVO₃ salts was suggested, too.

Key words: rare earth oxides co-doped zirconia ceramic coating sulfate and vanadate molten salts hot corrosion research progress

Received: 13 September 2018

ZTFLH:

TG174

Fund: Supported by National Natural Science Foundation of China(51361003);Youth Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metallic and Featured Material(GXYSYF1801);Funding Project of the Incubation Programme for Thousands of Youth Backbone Teachers for Guangxi Institution of Higher Educations (the first batch)

Corresponding Authors: Tianquan LIANG E-mail: liangtianquan@gxu.edu.cn

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	Chao CHEN
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	Xiuhai ZHANG
	Jianmin ZENG

Cite this article:

CHEN Chao,LIANG Yanfen,LIANG Tianquan,MAN Quanyan,LUO Yidong,ZHANG Xiuhai,ZENG Jianmin. Research Progress on Hot Corrosion of Rare Earth Oxides Co-doped ZrO₂ Ceramic Coatings in Molten Na₂SO₄+NaVO₃ Salts. Journal of Chinese Society for Corrosion and protection, 2019, 39(4): 291-298.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.132 OR https://www.jcscp.org/EN/Y2019/V39/I4/291

Fig.1 Relationship between Y₂O₃ content and cycle life of YSZ coating^[9]

Fig.2 Content of m-ZrO₂ in as-prepared ScYSZ after hot corrosion in molten NaVO₃ at 700 ℃ or 900 ℃ for 100 h^[16]

Fig.3 XRD patterns of YSZ (a) and CYSZ (b) coatings after hot corrosion in Na₂SO₄+V₂O₅ molten salt at 1000 ℃ for 12 and 30 h, respectively^[17]

Fig. 4 XRD spectra of ScYSZ (a) and YSZ (b) coatings after hot corrosion in Na₂SO₄+V₂O₅ molten salt at 1000 ℃^[8]

Table 1 Chemical reactivities of various oxides with vanadate compounds^[19]

Fig.5 SEM surface morphologies of YSZ (a) and CYSZ (b) after hot corrosion in Na₂SO₄+V₂O₅molten salt at 1050 ℃ for 20 and 28 h, respectively^[20]

Fig.6 SEM surface morphologies of TiYSZ after hot corrosion in Na₂SO₄+V₂O₅molten salt at 1050 ℃ for 20 h (a) and 40 h (b)^[20]

Fig.7 Typical structure of YSZ thermal barrier coating

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