Preparation and High Temperature Oxidation Resistance of Zr-SiO2 Composite Coating on Ti45Al8.5Nb Alloy

doi:10.11902/1005.4537.2024.004

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (6): 1423-1434 DOI: 10.11902/1005.4537.2024.004

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Preparation and High Temperature Oxidation Resistance of Zr-SiO₂ Composite Coating on Ti45Al8.5Nb Alloy

WU Liangliang, YIN Ruozhan, CHEN Zhaoxu, LIANG Junyue, SUN Qingqing, WU Liankui(

), CAO Fahe

School of Materials, Sun Yat-sen University, Shenzhen 518107, China

Cite this article:

WU Liangliang, YIN Ruozhan, CHEN Zhaoxu, LIANG Junyue, SUN Qingqing, WU Liankui, CAO Fahe. Preparation and High Temperature Oxidation Resistance of Zr-SiO₂ Composite Coating on Ti45Al8.5Nb Alloy. Journal of Chinese Society for Corrosion and protection, 2024, 44(6): 1423-1434.

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Abstract

Addressing the issue of crack formation in SiO₂ coatings during high-temperature oxidation, a supplementary Zr layer was applied onto the SiO₂ coating surface through magnetic sputtering. This study revealed that the Zr layer, upon oxidation, transformed into ZrO₂, may effectively amend the cracks and voids that emerged during the sintering process of the SiO₂ coating. Furthermore, it mitigated the thermal expansion coefficient (TEC) disparity between TiAl and SiO₂ coatings. In addition, the ZrO₂-SiO₂ skeleton structure formed during the oxidation process may be able to improve the stability of the coating structure. The resultant Zr-SiO₂ composite coating significantly impeded oxygen inward diffusion from the ambient environment to the Ti45Al8.5Nb substrate, even the outward diffusion of alloy elements in the early stage of oxidation, which notably enhancing its resistance against high-temperature oxidation. Notably, limited growth of oxide particles was observed on the alloy, with a negligible increase in the thickness of oxide scale. Additionally, following a period of 100-hour oxidation at 900^oC, mutual element diffusion from both the substrate and coating led to the formation of a three-layered interdiffusion zone (Ti, Nb)O₂/Ti₅Si₃ + Al₂O₃ + Nb₃Al/TiN. This interdiffusion zone notably bolstered the bond strength between the composite coating and the Ti45Al8.5Nb substrate.

Key words: Zr-SiO₂ composite coating defect inhibition high-temperature oxidation resistance elemental diffusion

Received: 02 January 2024 32134.14.1005.4537.2024.004

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51971205);Guangdong Basic and Applied Basic Research Foundation(2021B1515020056)

Corresponding Authors: WU Liankui, E-mail: wulk5@mail.sysu.edu.cn

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	WU Liangliang
	YIN Ruozhan
	CHEN Zhaoxu
	LIANG Junyue
	SUN Qingqing
	WU Liankui
	CAO Fahe

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.004 OR https://www.jcscp.org/EN/Y2024/V44/I6/1423

Fig.1 SEM images (a, b) and EDS analysis (c) of as-prepared Zr-SiO₂ composite coating

Fig.2 XRD pattern of as-prepared Zr-SiO₂ composite coating

Fig.3 Cross-sectional SEM image (a), element line scannings along the yellow arrow in Fig.3a (b) and element mappings (c) of the as-prepared Zr-SiO₂ composite coating

Table 1 Element contents at the marked points in Fig.3a

Fig.4 Oxidation kinetics of Ti45Al8.5Nb alloy without and with SiO₂ and Zr-SiO₂ coatings during oxidation at 900^oC in air (a), and surface XRD pattern of Zr-SiO₂ composite coating after oxidation for 100 h (b)

Fig.5 Surface SEM images of Ti45Al8.5Nb alloy (a, d), SiO₂ coating (b, e), and Zr-SiO₂ composite coating (c, f) after isothermal oxidation at 900^oC for 100 h

Table 2 Element contents at the marked regions and points in Fig.5

Fig.6 Cross-sectional SEM image (a), element line scannings along the yellow arrow in Fig.6a (b) and element mappings (c) of Zr-SiO₂ composite coating oxidized at 900^oC for 100 h

Table 3 Element contents at the marked points in Fig.6a

Fig.7 EPMA elemental distributions of the cross section of Zr-SiO₂ composite coating oxidized at 900^oC for 100 h

Fig.8 Raman spectrum (a), optical surface morphology (b) and Raman spectra of the marked positions 1 (c) and 2 (d) in Fig.8b for SiO₂ coating (a) and Zr-SiO₂ composite coating (b-d) after oxidation at 900^oC for 100 h

Table 4 Comparison of peak positions of Raman spectra at the points 1 and 2 in Fig.8b and corresponding literature data (T represents tetragonal ZrO₂).

Fig.9 Surface XPS analysis results of Zr-SiO₂ composite coating oxidized at 900℃ for 100 h: (a) full spectrum and semi-quantitative element content analysis, and fine spectra of (b) Zr, (c) Si, (d) Al, (e) Ti, (f) O and (g) K

Fig.10 Schematic diagrams of the changes of microstructures and phase compositions of SiO₂ coating (a) and Zr-SiO₂ composite coating (b) during initial sintering and subsequent isothermal oxidation

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