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Properties of MgO transparent ceramics prepared at low temperature using high sintering activity MgO powders
Author(s) -
Wei Yujing,
Gu Shijia,
Fang Hailiang,
Luo Wei,
Zhang Xin,
Wang Lianjun,
Jiang Wan
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17267
Subject(s) - materials science , sintering , spark plasma sintering , ceramic , fracture toughness , indentation hardness , composite material , transmittance , transparent ceramics , thermal conductivity , flexural strength , microstructure , optoelectronics
Transparent MgO ceramics are successful fabricated via spark plasma sintering at lower temperature using the high sintering activity powders synthesized by precipitated method. The samples were detected by XRD, SEM, TEM, BET, UV‐Vis‐NIR, microhardness, and so on. The results show that all ceramics prepared at 700°C‐900°C are visually transparent and the sample sintered at 860°C for 5 min exhibits the superior transmittance of 60% (800 nm). It is also found that the mechanical and thermal properties of MgO ceramics are all increasing firstly and then decreasing with the increase in the sintering temperature. And the maximum value of hardness, fracture toughness, MSP strength, and Young's modulus of MgO ceramics is 8.25 GPa, 2.01 MPa·m 1/2 , 206 MPa, and 286 GPa, respectively. Moreover, the thermal conductivity of MgO ceramics sintered at 860°C can reach 48.4 W/mK at room temperature.