X-RAY RESIDUAL STRESS MEASUREMENT OF PLASMA SPRAYED ALUMINA FILM

Abstract The development of ceramic coating to metals was stimulated by the need for the materials with high temperature, wear and corrosion resistant. Recently, sprayed coatings are widely used as a ceramic coating methods. In the present study, alumina ceramics was coated on 0.45 mass% carbon steel by plasma spraying. And the residual stress in the coated film was measured by using X-ray diffraction from the (800) plane of γ-alumina by Co-Ka radiation. The mechanical elastic constant increased with decreasing amount of cracks and pores in the coated film made under plasma spraying. The X-ray elastic constant was larger than the mechanical one because the strain measured by X-ray was the average of crystalline phases. The residual stress measured by X-ray was tensile.