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Experiments on Laser powder bed fusion (LPBF) of powdered Ti on Al 2 O 3  substrate were conducted and the interface formation was studied using a multi-material fluid dynamics model. Results show that the melt pool is relatively shallow, with relatively flat interlayer interface under LPBF’s conduction mode. In this condition, a thin sheath of molten Al 2 O 3  forms and acts as a lubricating film for the molten Ti, leading to Rayleigh instability due to high flow inertia. Keyhole formation penetrates the Al 2 O 3  substrate, resulting in a wavy interlayer interface. The recoil pressure from the keyhole and overall melt inertia are suppressed by the highly viscous molten Al 2 O 3 , thereby improving single-track melt pool stability. However, the thermal expansion coefficient difference between Ti and Al 2 O 3  led to the formation of transverse cracks. Achieving a defect-free metal-on-ceramic single track remains a challenge, despite this study serving as a guide for melt track and interface control.

The formation mechanism of metal-ceramic interlayer interface during laser powder bed fusion