TY - JOUR
T1 - Influence of sintering aid on the translucency of spark plasma-sintered silicon nitride ceramics
AU - Yang, Wenwu
AU - Hojo, Junichi
AU - Enomoto, Naoya
AU - Tanaka, Yumi
AU - Inada, Miki
PY - 2013/8
Y1 - 2013/8
N2 - Single additives (Y2O3, MgO, and Al2O 3) were used as sintering aid of Si3N4. The density, crystal phase, microstructure, transmittance, hardness, and fracture toughness of sintered Si3N4 were investigated. Highly densified sintered bodies were obtained in single Y2O3 and MgO systems, but not in single Al2O3 system. The XRD results indicated that sintered bodies were composed of β-Si 3N4. The SEM images showed that all the sintered bodies had a fine-grained microstructure with an average diameter of 0.29-0.37 μm. The thickness of grain boundary was changed with additive content. The transmittance (T) and the wavelength (λ) followed the relationship of Tâ̂ exp(-λ-2.3) due to the light scattering. The transmittance was mainly influenced by the refractive index of additives and the thickness of grain boundary phase. The hardness and fracture toughness of sintered ceramics were 12.6-15.5 GPa and 6.2-7.2 MPam1/2, respectively.
AB - Single additives (Y2O3, MgO, and Al2O 3) were used as sintering aid of Si3N4. The density, crystal phase, microstructure, transmittance, hardness, and fracture toughness of sintered Si3N4 were investigated. Highly densified sintered bodies were obtained in single Y2O3 and MgO systems, but not in single Al2O3 system. The XRD results indicated that sintered bodies were composed of β-Si 3N4. The SEM images showed that all the sintered bodies had a fine-grained microstructure with an average diameter of 0.29-0.37 μm. The thickness of grain boundary was changed with additive content. The transmittance (T) and the wavelength (λ) followed the relationship of Tâ̂ exp(-λ-2.3) due to the light scattering. The transmittance was mainly influenced by the refractive index of additives and the thickness of grain boundary phase. The hardness and fracture toughness of sintered ceramics were 12.6-15.5 GPa and 6.2-7.2 MPam1/2, respectively.
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U2 - 10.1111/jace.12370
DO - 10.1111/jace.12370
M3 - Article
AN - SCOPUS:84881668240
SN - 0002-7820
VL - 96
SP - 2556
EP - 2561
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 8
ER -