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Enhancement of Functional Ceramic Coating Performance by Gas Tunnel Type Plasma Spraying

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Abstract

A high-precision plasma system has been pursued for advanced thermal processing. The gas tunnel type plasma jet device developed by the author exhibits high energy density and also high efficiency. Among its various applications is the plasma spraying of ceramics such as Al2O3 and ZrO2. The performance of these ceramic coatings is superior to conventional ones. Properties such as the mechanical and chemical properties of the zirconia coatings were reported in previous studies. In this study, the enhancement of the performance of functional ceramic coatings by the gas tunnel type plasma spraying method was carried out using different powders. Results show that the alumina/zirconia composite system exhibited improvements of mechanical properties and corrosion resistance. The alumina/zirconia composite coating has the potential for use as a high functionally graded thermal barrier coating. Another application of the gas tunnel type plasma is for surface modification of metals. As an example, TiN films were formed in 5 s and, thick TiN coatings were easily obtained by gas tunnel type plasma reactive spraying.

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Acknowledgment

The author would like to express thanks to many coworkers for the assistance in data analysis.

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Authors and Affiliations

  1. JWRI, Osaka University, Osaka, 567-0047, Japan

    Akira Kobayashi

  2. Malaysia-Japan International Institute of Technology (MJIIT), UTM KL, Kuala Lumpur, Malaysia

    Akira Kobayashi

  3. Graduate School of Engineering, University of Tokyo, Tokyo, 113-8656, Japan

    Akira Kobayashi

Authors
  1. Akira Kobayashi
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Correspondence to Akira Kobayashi.

Additional information

This article is an invited paper selected from presentations at the 6th Asian Thermal Spray Conference (ATSC 2014) and has been expanded from the original presentation. ATSC 2014 was held in Hyderabad, India, November 24-26, 2014, and was organized by the International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI) and the Asian Thermal Spray Society.

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Kobayashi, A. Enhancement of Functional Ceramic Coating Performance by Gas Tunnel Type Plasma Spraying. J Therm Spray Tech 25, 411–418 (2016). https://doi.org/10.1007/s11666-015-0336-x

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  • DOI: https://doi.org/10.1007/s11666-015-0336-x

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