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Effect of Thermal Treatment on High-Temperature Mechanical Properties Enhancement in LPPS, HVOF, and APS CoNiCrAlY Coatings

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Abstract

The mechanical properties of a MCrAlY coating significantly influence the initiation of cracks in the superalloy substrate under thermomechanical-fatigue conditions. Previous studies have developed a convenient method for evaluating the mechanical properties of sprayed coatings by lateral compression of a circular tube coating. This method does not need chucking, and manufacturing the free-standing coating is quite straightforward. In this study, the mechanical properties of the free-standing CoNiCrAlY coatings prepared using low-pressure plasma spraying (LPPS), high-velocity oxyfuel (HVOF) spraying, and atmospheric plasma spraying (APS) were systematically measured with the lateral compression method at room temperature through to 920 °C. The effect of postspray thermal treatments, in vacuum and in air, on the mechanical properties was investigated in the 400 to 1100 °C temperature range. It was found that high-temperature thermal treatment in air was effective in increasing the bending strength and Young’s modulus. It was especially effective on the APS coatings, which were produced using powders with average size 60 μm, and on HVOF coating, whose bending strengths increased by approximately three times. On the contrary, the enhancement in the LPPS and APS coatings produced with powders 21 μm in size was found to be approximately 1.6 times.

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Acknowledgment

This research has been supported by the Ministry of Education, Science, Sports, and Culture, Grant in Aid for Young Scientists (B), 20760078.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka, 572-8530, Japan

    Hiroyuki Waki

  2. Division of Mechanical and Control Engineering, Graduate School of Osaka Electro-Communication University, 18-8 Hatsu-cho, Neyagawa, Osaka, 572-8530, Japan

    Takeshi Kitamura

  3. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan

    Akira Kobayashi

Authors
  1. Hiroyuki Waki
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  2. Takeshi Kitamura
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  3. Akira Kobayashi
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Corresponding author

Correspondence to Hiroyuki Waki.

Additional information

This article is an invited paper selected from presentations at the 3rd Asian Thermal Spray Conference (ATSC2008) and has been expanded from the original presentation. ATSC2008 was held at Nanyang Executive Centre, Singapore, November 6-7, 2008, and chaired by K.A. Khor.

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Waki, H., Kitamura, T. & Kobayashi, A. Effect of Thermal Treatment on High-Temperature Mechanical Properties Enhancement in LPPS, HVOF, and APS CoNiCrAlY Coatings. J Therm Spray Tech 18, 500–509 (2009). https://doi.org/10.1007/s11666-009-9402-6

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  • DOI: https://doi.org/10.1007/s11666-009-9402-6

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