Mechanical Behavior of Spray-Coated Metallic Laminates
- 227 Downloads
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.
Keywordsfinite element modeling HVOF mechanical behavior repair
This research was supported through funding by the Innovations Deserving Exploratory Analysis (IDEA) program of the Transportation Research Board of the National Academy of Sciences, managed by Dr. I. Jawed (NCHRP IDEA 155). The authors also acknowledge support from the Stony Brook’s Industrial Consortium for Thermal Spray Technology.
- 6.A. Verstak and V. Baranovski, Activated Combustion HVAF Coatings for Protection Against Wear and High Temperature Corrosion, Therm. Spray Adv. Sci. Appl. Technol., 2003, 2003, p 5-8Google Scholar
- 9.A. Savarimuthu, H. Taber, I. Megat, J. Shadley, E. Rybicki, W. Cornell, W. Emery, D. Somerville, and J. Nuse, Sliding Wear Behavior of Tungsten Carbide Thermal Spray Coatings for Replacement of Chromium Electroplate in Aircraft Applications, J. Therm. Spray Technol., 2001, 10(3), p 502-510CrossRefGoogle Scholar
- 12.M. B. Beardsley, and J. L. Sebright, Structurally Integrated Coatings for Wear and Corrosion, 2008, No. DOE/GO14037Google Scholar
- 13.C. Weyant and S. Sampath, Engineered Thermal Spray Coatings for Bridge Repair and Reclamation, Adv. Mater. Process., 2011, 169(5), p 64-65Google Scholar
- 24.T. Varis, T. Suhonen, A. Ghabchi, A. Valarezo, S. Sampath, X. Liu, and S.-P. Hannula, Formation Mechanisms, Structure, and Properties of HVOF-Sprayed WC-CoCr Coatings: An Approach Toward Process Maps, J. Therm. Spray Technol., 2016, 23, p 1-10Google Scholar