Mechanical properties of transparent polycrystalline silicon nitride

Rak Joo Sung, Takafumi Kusunose, Tadachika Nakayama, Yoon Ho Kim, Tohru Sekino, Soowohn Lee, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A novel transparent polycrystalline silicon nitride was fabricated by hot-press sintering with MgO and AlN as additives. The mixed powder with 3 wt.% MgO and 9 wt.% AlN was sintered at 1900°C for 1 hour under 30 MPa pressure in a nitrogen gas atmosphere. Transparent polycrystalline silicon nitride was successfully fabricated. The mechanical properties such as density, hardness, young's modulus, fracture strength and fracture toughness were evaluated. The effect of α/β phase on the mechanical properties of transparent polycrystalline silicon nitride was investigated. The properties were changed depending on the amount of α/β phase. The hardness and Young's modulus increased with increasing the volume fraction of α-phase fraction as a reflection of the higher hardness of α-phase Si3N 4. The fracture toughness and fracture strength decreased with decreasing the volume fraction of β-phase Si3N4.

Original languageEnglish
Pages (from-to)305-308
Number of pages4
JournalKey Engineering Materials
Publication statusPublished - 2006
Externally publishedYes


  • AlN
  • Hot-press
  • Silicon nitride
  • Transparent

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Mechanical properties of transparent polycrystalline silicon nitride'. Together they form a unique fingerprint.

Cite this