Journal of Thermal Spray Technology

, Volume 25, Issue 5, pp 1009–1019

Mechanical Behavior of Spray-Coated Metallic Laminates

Peer Reviewed

Abstract

Thermal spray (TS) coatings have been extensively utilized for various surface modifications such as enhancing wear/erosion resistance and thermal protection. In the present study, a new function of TS material is explored by studying its load-carrying capability. Due to the inherent microstructures containing voids and interfaces, it has been presumed TS materials were not suitable to bear loads. However, the recent advances in TS technology to manufacture near fully dense TS coatings have expanded their potential applications. In the current experiments, TS nickel coatings are deposited onto metallic substrates, and their mechanical behaviors are closely examined. Based on the measured data, the estimated elastic modulus of TS Ni is about 130 GPa (35% less than bulk value), and the maximum tensile strength is about 500 MPa (comparable to bulk value). It was found that such a high value is attainable because the coating is deposited onto a substrate, enabling a load-transfer mechanism and preventing coating failure at a much lower stress level. Three distinct deformation stages are identified to describe this behavior. Such a clarification is critical for enabling TS process to restore structural parts as well as to additively manufacture load-bearing components.

Keywords

finite element modeling HVOF mechanical behavior repair 

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Copyright information

© ASM International 2016

Authors and Affiliations

  • Andrew Vackel
    • 1
  • Toshio Nakamura
    • 1
  • Sanjay Sampath
    • 1
  1. 1.Center for Thermal Spray ResearchStony Brook UniversityStony BrookUSA

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