Residual stresses in HVOF-sprayed ceramic coatings

摘要: Abstract In this paper, the residual stress state of thermally sprayed ceramic coatings was examined by combining different experimental and analytical techniques, in order to provide a thorough characterisation through-thickness profiles cross-verification results. HVOF-sprayed ceramics, manufactured using commercial nanostructured Al 2 O 3 powders Cr powders, atmospheric plasma-sprayed (APS) were investigated. The near-surface measured X-ray diffraction. profile intrinsic quenching analytically computed Tsui–Clyne iterative model, measurement result as input, results validated substrate chemical removal method. Further verification achieved applying in-situ curvature technique deposition coating. deposited both conventional feature similar, almost equibiaxial tensile on top surface (116.5 MPa 136.5 MPa, respectively) moderate gradient (about 12 MPa 20 MPa, respectively). Their stresses estimated be 184 MPa 205 MPa, respectively. APS possesses higher (220 MPa) (311 MPa). However, it shows less pronounced (≈ 3 MPa) than -based coatings, because cracks, pores weak lamella boundaries coating can accommodate deformations induced bending moments arising during cooling. model-derived HVOF technique. are significantly different. They display lower region: 20 MPa coating, 27.5 MPa one. also exhibits very large ≈ 77 MPa. Machining sliding processes (like polishing dry tribological testing) change their compressive ones.