Abstract

An original investigation of the crystallographic texture in alumina plasma sprayed coatings has been made by X-ray diffraction and transmission electron microscopy. A fibre texture has been revealed in these alumina coatings. The (100) base plane of γ Al₂O₃ is predominently parallel to the. coating surface. The texture intensity increases from the surface in contact with the metal to the top surface of the coatings. After annealing the textured γ Al₂O₃ coatings at 1200℃, we have studied the relationships between γ and α Al₂O₃ phases.