|About this Abstract
||MS&T23: Materials Science & Technology
||Manufacturing and Processing of Advanced Ceramic Materials
||Micromechanical Properties and Microstructures of AC and DC Flash-sintered Alumina
||Chao Shen, Tongjun Niu, Bo Yang, Jaehun Cho, Zhongxia Shang, Tianyi Sun, Anyu Shang, R. Edwin Garcia, Haiyan Wang, Xinghang Zhang
|On-Site Speaker (Planned)
Alumina (α-Al2O3), one of the most widely used structural ceramics for industrial applications, requires high temperature and long sintering time to achieve a fully dense structure through conventional pressureless sintering. Recently, several attempts have been made to reduce the sintering time and temperature of Al2O3 through the application of an electric field with limited success. In this study, alternating current (AC) and direct current (DC) flash sintering techniques were employed to obtain high-density Al2O3 within 10 min. The microindentation measurements reveal that the AC-FS Al2O3 provides the highest fracture toughness and a high hardness among all sintered specimens. The improved mechanical properties of AC-FS Al2O3 are attributed to defects, such as dislocations as well as stacking faults observed in the FS specimens. This study provides a fresh perspective on the low-energy manufacturing of structural ceramics with improved properties.