Fig. 1. Specific heat capacity and thermal conductivity of Al2O3

Fig. 2. Experimental platform for SLM forming of ceramics

Fig. 3. Simulation results. (a) Overall temperature field; (b) cross-sectional profile of flow field

Fig. 4. Molten pool dimensions in simulation and experiment. (a) Geometry of molten pool and temperature cloud map for laser power of 140 W and scanning speed of 70 mm·s-1; (b) SEM image of specimen for laser power of 140 W and scanning speed of 70 mm·s-1; (c) molten pool sizes in numerical simulation for different scanning speeds but same laser power of 140 W; (d) molten pool sizes in numerical simulation for different laser powers but same scanning speed of 90 mm·s-1

Fig. 5. Temperature gradient along path at z=0 and y=0.5474 mm for P=140 W and v=70 mm·s-1

Fig. 6. SEM images of parts fabricated at different process parameters

Fig. 7. Surface solidification structure on the ceramic specimen. (a) Stripy structure; (b) finger-shaped structure

Fig. 8. Effect of Marangoni number on flow pattern

Fig. 9. Prediction results of surface microstructure at different laser powers and scanning speeds. (a) Prediction results of convection on molten pool surface; (b) corresponding flow pattern

Fig. 10. Prediction results of surface microstructure at different preheating temperatures. (a) Prediction results of convection on molten pool surface; (b) corresponding flow pattern