|About this Abstract
||Materials Science & Technology 2020
||Additive Manufacturing of Ceramic-based Materials: Process Development, Materials, Process Optimization and Applications
||Ultra-fast, Selective Laser Sintering during Additive Manufacturing of Alumina
||Xiao Geng, Jincheng Lei, Shenglong Mu, Hai Xiao, Jianhua Tong, Rajendra K Bordia, Fei Peng
|On-Site Speaker (Planned)
Selective laser sintering is an important step for additive manufacturing of dense ceramics. We found an ultra-fast sintering phenomenon of alumina achieved using scanning laser irradiation. Using CO2 laser irradiation, micrometer alumina powder can be sintered to close-to full density within a few seconds. The relative density and grain size of the laser-sintered alumina gradually decreased from the center of the laser beam to the edge. Anisotropy of the grain size was observed along and perpendicular to the scanning direction. The sintering master curve of grain size versus relative density, which reflects the sintering mechanism, was found to be affected by the laser scanning speed. When the laser scanning speed was 0.1mm/s, grain size suppression was found for even at high density. However, at lower scanning speed, there was significant grain growth in the regions where the relative density was greater than 90%.