Abstract
In the present study, the effect of deposition temperature in the range 773–973 K on structural and nanomechanical properties of lanthanum zirconate (La2Zr2O7) ceramic coatings deposited on Inconel-718 substrates by EB-PVD process has been investigated. X-ray diffraction and Raman spectroscopy were used to understand the structural details of lanthanum zirconate coatings. Structural studies show that the coatings have defect fluorite structure and are textured at the highest deposition temperature of 973 K. Increase in the surface roughness as a result of increased crystallite size was discussed from SEM and AFM analyses. Scratch test showed higher adhesion strength of the coating with the substrate for the film deposited at higher deposition temperature. Nanoindentation studies indicated that higher deposition temperature leads to enhanced indentation hardness and modulus of the coatings. From the nanoindentation results, resistance to plastic deformation and elastic recovery were also determined to explain the suitability of the lanthanum zirconate as a top coat material for thermal barrier coatings.
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