DED Type Laser Additive Manufacturing Technology of Oxide Ceramics

DED laser additive manufacturing is a simpler, more reproducible technology than conventional sintering for fabricating ceramics because it is not restricted by size limitations or location and thus could be utilized for the maintenance and repair of parts. When this method, which applies locally high energy, is employed with ceramics with high melting points and brittleness, defects such as pores and cracks are likely to occur. Therefore, various studies have been conducted to reduce defects and increase toughness. Herein, the effects of the parameters and additives in the DED process for oxide ceramics are summarized, and the influence of using auxiliary devices such as ultrasonic vibration is introduced. This work aims to provide ideas for the design of ceramic materials and systems for DED additive manufacturing, and it summarizes the issues that must be addressed for researchers interested in ceramic manufacturing using the DED method. Key words: Directed energy deposition, Oxide ceramic, Additive manufacturing, Laser engineered net shaping