Flash Sintering of dense alumina ceramic discs with high hardness. Issue 1 (January 2022)

• Record Type: Journal Article
• Authors: Yang, Shoulei; Yang, Sirui; Zhu, Yinxiao; Fan, Lei; Zhang, Mengwen
• Is Part Of: Journal of the European Ceramic Society. Volume 42:Issue 1(2022)
• Page Start: 202
• Page End: 206
• Publication Date: 2022-01
• Subjects: Alumina ceramics -- Flash sintering -- Hardness -- Fracture toughness; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.09.061
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: MgO-doped-Al2 O3 ceramic discs were fabricated by flash sintering (FS) and pressureless sintering (PS). The results showed that MgO-doped Al2 O3 exhibited typical characteristics of flash sintering under an electric field in excess 2500 V/cm. Compared with the PS- fabricated specimen, the flash sintered specimens exhibited sub-micron grains (≤760 nm) and homogeneous microstructures. The relative density of the flash sintered MgO-doped Al2 O3 ceramics increased with current density, reaching 99.91 % when the current density increased to 7 mA/mm 2 . The FS-fabricated sample exhibited higher hardness (21.02 GPa) and fracture toughness (3.46 MPa m 1/2 ) than PS-fabricated sample.