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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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(3): 289-296

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://doi.org/10.1007/s12613-017-1407-4

Cite this article as:

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://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

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Corresponding author:
Chun-gen Zhou E-mail: cgzhou@buaa.edu.cn
Received: 4 August 2016; Revised: 3 November 2016; Accepted: 7 November 2016

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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