Abstract
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 language | English |
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Pages (from-to) | 305-308 |
Number of pages | 4 |
Journal | Key Engineering Materials |
Volume | 317-318 |
Publication status | Published - 2006 |
Externally published | Yes |
Keywords
- AlN
- Hot-press
- Silicon nitride
- Transparent
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering