Laser surface texturing was adopted to improve the adhesion bond strength of thermal barrier coating generally used in aero turbine components. A picosecond Q-switched Nd: YAG laser operating at 532 nm wavelength was used to perform laser surface texturing. Two different types of texture, namely, an oriented square pattern was having 250μm width and 250 μm pitch and a trapezoidal pattern having 150 μm width and 250 μm pitch were textured on nickel superalloy C-263 surface before air plasma spraying of NiCrAlY bond coat. Optical Microscopes (OM) and White Light Interferometer (WLI) characterized the microstructure and surface morphology of these patterns. The pre defined texture in the laser-ablated region and greater surface contact enhanced the mechanical interlocking with the bond coat. The generation of grooves increased the surface roughness of textured substrate 6 times greater than grit blasting. Further, the trapezoidal pattern exhibited higher surface roughness due to a greater laser ablated area. The adherence was tested by the adhesion bond strength test, which showed 35 MPa and 37 MPa adhesive strength for oriented square and trapezoidal patterns. The fractal analysis showed that the textured substrate failed predominantly by cohesion.
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To Cite this article
S. V. Aditya, M. Duraiselvam, K. Parthiban and V. Bagade, “Laser surface texturing of nickel superalloy to improve adhesion bond strength of thermal barrier coating,” International Journal of Applied and Physical Sciences, vol. 3, no. 3, pp. 85-92, 2017.
