Influence of Sintering Aid on the Translucency of Spark Plasma‐Sintered Silicon Nitride Ceramics. Issue 8 (6th May 2013)

• Record Type: Journal Article
• Authors: Yang, Wenwu; Hojo, Junichi; Enomoto, Naoya; Tanaka, Yumi; Inada, Miki; Chan, H.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 8(2013)
• Page Start: 2556
• Page End: 2561
• Publication Date: 2013-05-06
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12370
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" xml:lang="en" id="jace12370-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Single additives (Y₂O₃, MgO, and Al₂O₃) 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‐Si₃N₄. 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 (<italic>T</italic>) and the wavelength (λ) followed the relationship of T∝ 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 MPam^1/2, respectively.</p> </abstract>