Oxidation Behavior of CVD Aluminized Coatings on DD6 Single Crystal Ni-based Superalloy

doi:10.11902/1005.4537.2024.317

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (1): 148-154 DOI: 10.11902/1005.4537.2024.317

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Oxidation Behavior of CVD Aluminized Coatings on DD6 Single Crystal Ni-based Superalloy

XU Xiwen¹^,², SHU Xiaoyong¹^,²(

), CHEN Zhiqun¹^,², HE Hairui¹^,², DONG Shuhe¹^,², FANG Yuqing¹^,², PENG Xiao¹^,²

1 School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2 Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang 330063, China

Cite this article:

XU Xiwen, SHU Xiaoyong, CHEN Zhiqun, HE Hairui, DONG Shuhe, FANG Yuqing, PENG Xiao. Oxidation Behavior of CVD Aluminized Coatings on DD6 Single Crystal Ni-based Superalloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 148-154.

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Abstract

Al-diffusion coatings composed primarily of δ-Ni₂Al₃ phase were developed on DD6 single-crystal nickel-based superalloy and pure nickel via chemical vapor deposition (CVD) technique at 750 ^oC, respectively. Results of oxidation in air at 1000 ^oC revealed that the CVD aluminide coating on DD6 superalloy presented higher oxidation rate rather than its counterpart on Ni. Photo-luminescence spectroscopy analysis indicated that during the early oxidation stage a single Al₂O₃ scale could formed on the two CVD aluminide coatings; however, there was a significant enhancement in the spectrum intensity of metastable θ-Al₂O₃ within the alumina scale on DD6 superalloy. It is proposed that elements from DD6 superalloy diffused into the alumina scale during oxidation, thereby influencing the oxidation rate by prolonging the transformation period of θ-Al₂O₃ into stable α-Al₂O₃ and promoting Al³⁺ outward diffusion for oxide growth.

Key words: single-crystal Ni-based superalloy chemical vapor deposition aluminum diffusion coatings high temperature oxidation

Received: 27 September 2024 32134.14.1005.4537.2024.317

ZTFLH:

TG178

Corresponding Authors: SHU Xiaoyong, E-mail: xiaoyong202@126.com

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	XU Xiwen
	SHU Xiaoyong
	CHEN Zhiqun
	HE Hairui
	DONG Shuhe
	FANG Yuqing
	PENG Xiao

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.317 OR https://www.jcscp.org/EN/Y2025/V45/I1/148

Fig.1 XRD patterns of aluminized coatings on Ni and DD6 superalloy

Fig.2 Cross-sectional morphologies (a, b) and emental X-ray mappings (c) of CVD aluminized coatings on Ni (a) and DD6 superalloy (b, c)

Table 1 EDS determined chemical compositions of CVD-formed Ni₂Al₃coatings on pure Ni and DD6 superalloy

Fig.3 Oxidation kinetic curves (a) and corresponding parabolic plots (b) of CVD aluminized coatings on Ni and DD6 superalloy during exposure to air at 1000 ^oC

Fig.4 XRD patterns of CVD aluminized coatings on Ni and DD6 superalloy after 20 h oxidation in air at 1000 ^oC

Fig.5 Surface morphologies of CVD aluminized coatings on Ni (a, b) and DD6 superalloy (c, d) after 20 h oxidation in air at 1000 ^oC

Fig.6 Cross-sectional morphologies of CVD aluminized coatings on Ni (a, b) and DD6 superalloy (c, d) after 20 h oxidation in air at 1000 ^oC

Fig.7 Photo-stimulated luminescence spectra of Al₂O₃ scales formed on CVD aluminized Ni and DD6 superalloy during short-term oxidation of 2 h in air at 1000 ^oC

Fig.8 Surface morphologies of Al₂O₃ scales formed on CVD aluminized Ni (a) and DD6 superalloy (b) after short-term oxidation of 2 h in air at 1000 ^oC

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