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Development of Oxide Dispersion Strengthened MCrAlY Coatings

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Abstract

MCrAlY materials are widely used as bond coats for thermal barrier coatings on turbine blades. The aim of this work is to improve mechanical properties and wear resistance of thermal sprayed NiCoCrAlY-coatings by strengthening the coating with hard phase particles. In order to retain the effect of the dispersion reinforcement at high temperatures, the use of temperature-stable oxide hard phases such as ZrO2-Y2O3 is necessary. To realize this new material structure, the high-energy ball-milling process is applied and analyzed. The mixture ratio between NiCoCrAlY and ZrO2-Y2O3 was varied between 5 and 10 wt.% ZrO2-Y2O3. The influences of the milling time of the high-energy ball-milling process on the distribution of the hard phases in the metal matrix were analyzed. After spraying with a HVOF system the mechanical properties of the coatings are measured and compared with conventional NiCoCrAlY coatings.

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Acknowledgments

The investigations were carried out as part of a research project founded by the German Research Foundation (LU 232/95-2). Our thanks are due for this support.

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Authors and Affiliations

  1. Surface Engineering Institute, RWTH Aachen University, Aachen, Germany

    K. Bobzin, T. Schläfer, K. Richardt & M. Brühl

Authors
  1. K. Bobzin
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  2. T. Schläfer
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  3. K. Richardt
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  4. M. Brühl
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Corresponding author

Correspondence to M. Brühl.

Additional information

This article is an invited paper selected from presentations at the 2008 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Thermal Spray Crossing Borders, Proceedings of the 2008 International Thermal Spray Conference, Maastricht, The Netherlands, June 2-4, 2008, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2008.

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Bobzin, K., Schläfer, T., Richardt, K. et al. Development of Oxide Dispersion Strengthened MCrAlY Coatings. J Therm Spray Tech 17, 853–857 (2008). https://doi.org/10.1007/s11666-008-9244-7

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  • DOI: https://doi.org/10.1007/s11666-008-9244-7

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