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Deposition of Al2O3-TiO2 Nanostructured Powders by Atmospheric Plasma Spraying

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Abstract

Al2O3-13%TiO2 coatings were deposited on stainless steel substrates from conventional and nanostructured powders using atmospheric plasma spraying (APS). A complete characterization of the feedstock confirmed its nanostructured nature. Coating microstructures and phase compositions were characterized using SEM, TEM, and XRD techniques. The microstructure comprised two clearly differentiated regions. One region, completely fused, consisted mainly of nanometer-sized grains of γ-Al2O3 with dissolved Ti+4. The other region, partly fused, retained the microstructure of the starting powder and was principally made up of submicrometer-sized grains of α-Al2O3, as confirmed by TEM. Coating microhardness as well as tribological behavior were determined. Vickers microhardness values of conventional coatings were in average slightly lower than the values for nanostructured coating. The wear resistance of conventional coatings was shown to be lower than that of nanostructured coatings as a consequence of Ti segregation. A correlation between the final properties, the coating microstructure, and the feedstock characteristics is given.

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Acknowledgments

The authors thank the EU Network of Excellence “Knowledge-based Multicomponent Materials for Durable and Safe Performance” (KMM-NoE, NMP3-CT-2004-502243) for financial support. They are also grateful for the support of the Valencian Institute of Small and Medium-Sized Enterprises (IMCITA/2005/2-IMCOCA/2006/1) and of the Spanish Department for Education and Sciences (MAT2006-12945-C03).

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Authors and Affiliations

  1. Instituto de Tecnología Cerámica, Asociación de Investigación de las Industrias Cerámicas, Universitat Jaume I., Castellon, Spain

    E. Sánchez, E. Bannier & V. Cantavella

  2. Instituto de Tecnología de Materiales, Universidad Politécnica de Valencia, Valencia, Spain

    M.D. Salvador & E. Klyatskina

  3. Institute of Metallurgy and Materials Science, Krakow, Poland

    J. Morgiel & J. Grzonka

  4. Department of Materials, Imperial College London, London , SW7 2BP, UK

    A.R. Boccaccini

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  1. E. Sánchez
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  2. E. Bannier
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  3. V. Cantavella
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  4. M.D. Salvador
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  5. E. Klyatskina
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  6. J. Morgiel
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  7. J. Grzonka
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  8. A.R. Boccaccini
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Correspondence to E. Bannier.

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Sánchez, E., Bannier, E., Cantavella, V. et al. Deposition of Al2O3-TiO2 Nanostructured Powders by Atmospheric Plasma Spraying. J Therm Spray Tech 17, 329–337 (2008). https://doi.org/10.1007/s11666-008-9181-5

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  • DOI: https://doi.org/10.1007/s11666-008-9181-5

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