Fig. 1. X-ray diffraction patterns of ceramic coatings prepared by two processes. (a) Laser remelting; (b) plasma spraying

Fig. 2. Ceramic coating prepared by composite process

Fig. 3. SEM image of the coating cross section obtained by plasma spraying

Fig. 4. SEM image of cross section of ceramic coating and metal substrate. (a) 1000×; (b) 2000×; (c) 5000×;(d) substrate surface

Fig. 5. Scanning pattern of coating cross section

Fig. 6. Surface scanning pattern of the cross section of the composite coating. (a) Fe element; (b) Zr element; (c) O element

Fig. 7. Metallographic organization in different regions. (a) Overall morphology; (b) upper part of the remelting zone; (c) middle part of the remelting zone; (d) lower part of the remelting zone; (e) boundary area between the heat affected zone and the substrate

Fig. 8. Hardness distribution of two ceramic coatings