Influence of sintering aid on the translucency of spark plasma-sintered silicon nitride ceramics

Wenwu Yang, Junichi Hojo, Naoya Enomoto, Yumi Tanaka, Miki Inada

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2556-2561
Number of pages6
JournalJournal of the American Ceramic Society
Issue number8
Publication statusPublished - Aug 2013

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


Dive into the research topics of 'Influence of sintering aid on the translucency of spark plasma-sintered silicon nitride ceramics'. Together they form a unique fingerprint.

Cite this