Oxidation and interdiffusion behavior of a germanium-modified silicide coating on an Nb-Si-based alloy

Jin-long Li; Wan Wang; Chun-gen Zhou

doi:10.1007/s12613-017-1407-4

Volume 24 Issue 3

Mar. 2017

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International Journal of Minerals, Metallurgy and Materials > 2017 > 24(3): 289-296. > DOI: 10.1007/s12613-017-1407-4

Jin-long Li, Wan Wang, and Chun-gen Zhou, Oxidation and interdiffusion behavior of a germanium-modified silicide coating on an Nb-Si-based alloy, Int. J. Miner. Metall. Mater., 24(2017), No. 3, pp.289-296. https://dx.doi.org/10.1007/s12613-017-1407-4

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Research Article

Oxidation and interdiffusion behavior of a germanium-modified silicide coating on an Nb-Si-based alloy

Author Affilications

Department of Materials Science and Engineering, Beihang University, Beijing 100191, China

Funds:

This work is financially supported by the National Natural Science Foundation of China (No. 51431003) and the Joint Funds of the National Natural Science Foundation of China (No. U1435201).

Received: 03 August 2016; Revised: 02 November 2016; Accepted: 06 November 2016;

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Abstract

Abstract

To investigate the interdiffusion behavior of Ge-modified silicide coatings on an Nb-Si-based alloy substrate, the coating was oxidized at 1250℃ for 5, 10, 20, 50, or 100 h. The interfacial diffusion between the (Nb,X)(Si,Ge)₂ (X=Ti, Cr, Hf) coating and the Nb-Si based alloy was also examined. The transitional layer is composed of (Ti,Nb)₅(Si,Ge)₄ and a small amount of (Nb,X)₅(Si,Ge)₃. With increasing oxidation time, the thickness of the transitional layer increases because of the diffusion of Si from the outer layer to the substrate, which obeys a parabolic rate law. The parabolic growth rate constant of the transitional layer under oxidation conditions is 2.018 μm·h^-1/2. Moreover, the interdiffusion coefficients of Si in the transitional layer were determined from the interdiffusion fluxes calculated directly from experimental concentration profiles.
- silicides,
- coatings,
- intermetallics,
- oxidation,
- interdiffusion

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References (37)

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