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Challenges of single-crystal CMSX-4 repair using cold spray

Létang M, Schmitt J, Sohn YJ, Sebold D, Karpstein N, Spiecker E, Kostka A, Guillon O, Vaßen R (2025)

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Publication Type: Journal article

Publication year: 2025

Journal

Book Volume: 513

Article Number: 132368

DOI: 10.1016/j.surfcoat.2025.132368

Abstract

The repair of gas turbine blades is of significant ecological and economic importance. Cold gas spraying (CGS) is a suitable method for this purpose due to its advantages and is widely studied in the literature. In this study, CGS is explored as a repair process for single-crystal CMSX-4 substrates, using the same material for the coating. Two powder fractions were investigated, but adhesion issues occurred, the material did not properly bond, and cracks were observed in the coatings To address these challenges, detailed powder analyses were performed using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Following preliminary experiments on gas pressure and gas temperature, it was determined that shorter spray distances have a positive effect on the coating quality To explain this, particle velocities were measured, and the stress states during the coating process were thoroughly analysed. Furthermore, single splat experiments were performed to gain a better understanding of the coating formation.

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How to cite

APA:

Létang, M., Schmitt, J., Sohn, Y.J., Sebold, D., Karpstein, N., Spiecker, E.,... Vaßen, R. (2025). Challenges of single-crystal CMSX-4 repair using cold spray. Surface & Coatings Technology, 513. https://doi.org/10.1016/j.surfcoat.2025.132368

MLA:

Létang, Maike, et al. "Challenges of single-crystal CMSX-4 repair using cold spray." Surface & Coatings Technology 513 (2025).

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