Residual Stresses Characterisation of Hard Ceramic Coating (SiC-5wt%Al2O3) Using X-Ray Diffraction Technique

Samah R. Hassan; Mudhar. A. Al-Obaidi; Hamid M. Mahan; Konovalov Sergey

doi:10.51173/jt.v6i3.2214

Authors

Samah R. Hassan Mechanical of Engineering, Diyala University, Dayala, Iraq
Mudhar. A. Al-Obaidi Technical Instructors Training Institute, Middle Technical University, Baghdad, Iraq https://orcid.org/0000-0002-1713-4860
Hamid M. Mahan Technical Institute / Baquba, Middle Technical University, Baghdad, Iraq
Konovalov Sergey Siberian State Industrial University, Novokuznetsk, 654007, Russia

DOI:

https://doi.org/10.51173/jt.v6i3.2214

Keywords:

SIC-5WT% AL2O3, Wear Protection Coatings, Residual Stresses, X-Ray Wavelength, X-Ray Diffraction Method

Abstract

The aim of this study is to measure residual stresses, specifically in wear protection coating, using the sin2ψ based on the X-ray diffraction technique. The combination of silicon carbide substrate and aluminium oxide (SiC-5wt.% Al2O3) is used as the wear protection coating, and AlNi alloy represents the bond coat, which is formed by the flame spraying method on the mild steel substrate. This in turn has enabled to reduce the thermal expansion constant between the substrate and composite ceramic layer. The diffraction angle, 2θ, is measured experimentally, and the lattice spacing is calculated using Bragg's Law using the measured diffraction angle and the known X-ray wavelength. Interestingly, stress calculations for the samples demonstrate a linear relationship of a slop proportionate to stress same as to homogenous isotropic samples in a bi-axial stress. Thus, the relationship between dspacing and sin2ψ is demonstrated as a straight line with a slope proportional to stress. However, the oscillatory trend showed the existence of in-homogeneous stress distribution. To resolve this challenge, X-ray elastic parameters are deployed instead of Poisson ratio (ν) and Young's modulus (E) values. The value of the residual stresses for these coatings calculated is compressive residual stresses of (-594.029 MPa).

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Author Biographies

Samah R. Hassan, Mechanical of Engineering, Diyala University, Dayala, Iraq

Mudhar. A. Al-Obaidi, Technical Instructors Training Institute, Middle Technical University, Baghdad, Iraq

Hamid M. Mahan, Technical Institute / Baquba, Middle Technical University, Baghdad, Iraq

Konovalov Sergey , Siberian State Industrial University, Novokuznetsk, 654007, Russia

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