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HVOF-Sprayed Nylon-11 + Nanodiamond Composite Coatings: Production & Characterization

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Abstract

High velocity oxy-fuel (HVOF) combustion spraying has previously been shown to be a viable method for depositing polymer and polymer/ceramic composite coatings. The addition of hard particulate reinforcing phases to soft polymeric matrices should improve their durability and sliding wear performance. Nanosized diamond is an ideal reinforcing phase, owing to its high hardness, low coefficient of friction, and desirable thermal properties. Composite coatings comprising a Nylon-11 matrix reinforced with nanodiamonds have been successfully produced by HVOF. An important challenge is preserving the structure of the nanoparticles after thermal spray deposition and achieving their uniform dispersion within the polymeric matrix. Raman spectroscopy and x-ray diffraction were used to confirm the presence and retention of nanodiamonds after HVOF deposition. Understanding of the role of process parameters, including the content of reinforcing phase in the matrix and powder preparation route is necessary. Nanoindentation studies demonstrated an improvement in creep behavior and recovery of the HVOF Nylon-11/nanodiamond composites subjected to deformation.

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Acknowledgments

The authors would like to acknowledge NanoBlox®, Inc. for supplying the nanodiamond powders and Arkema, Inc. for donating the Nylon-11 powders used in this work. The authors are grateful for the assistance of Mr. Dustin Doss, Ms. Dee Breger, Dr. Zhorro Nikolov, and the Centralized Research Facilities (CRF) at Drexel University. The authors would also like to thank K. Behler and S. Picchiotti for the helpful discussions.

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Authors and Affiliations

  1. Dipartimento Ingegneria Meccanica e Industriale, Università degli Studi “Roma Tre”, via della Vasca Navale 79, 00146, Rome, Italy

    A. Stravato

  2. Department of Materials Science and Engineering, Drexel University, 3141 Chestnut Street, Philadelphia, PA, USA

    R. Knight & V. Mochalin

  3. Nanoblox, Inc., Boca Raton, FL, USA

    S.C. Picardi

Authors
  1. A. Stravato
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  2. R. Knight
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  3. V. Mochalin
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  4. S.C. Picardi
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Corresponding author

Correspondence to R. Knight.

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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Stravato, A., Knight, R., Mochalin, V. et al. HVOF-Sprayed Nylon-11 + Nanodiamond Composite Coatings: Production & Characterization. J Therm Spray Tech 17, 812–817 (2008). https://doi.org/10.1007/s11666-008-9253-6

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  • DOI: https://doi.org/10.1007/s11666-008-9253-6

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