Ultra-high temperature oxide ceramics have excellent strength and structural stability

as well as outstanding oxidation and corrosion resistance at elevated temperatures

which are expected to become new ultrahigh temperature structural materials for long-term service under extremely high temperature oxidation environments. Laser additive manufacturing (LAM) technology represented by selective laser melting (SLM) and laser engineered net shaping (LENS) has the unique advantages of high efficiency

flexible manufacturing

and engineered net shaping. In recent years

it has been gradually applied to the preparation of ultra-high temperature oxide ceramics and has become a research hotspot in the field. In this paper

the technical principles and characteristics have been overviewed for SLM and LENS. The research progress of solidification defect control during the LAM processes for ultra-high temperature oxide ceramics has been investigated in detail from four aspects: process optimization

high temperature preheating

ultrasonic assistance

and doping. Finally

the development trend and research focus have been prospected for ultra-high temperature oxide ceramics by LAM.